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MS 1979 (2007) (English): ELECTRICAL INSTALLATIONS OF BUILDINGS - CODE OF PRACTICE
MALAYSIAN STANDARD
MS MS 1979:2007 1979:2007
ELECTRICAL INSTALLATIONS OF BUILDINGS - CODE OF PRACTICE
ICS: 91.140.50,29.020 ICS: 91.140.50,29.020 Descriptors practices ,, electrical electrical installations installations,, buildings, buildings , residential residential houses, Des criptors :: pr2ctices houses , dwellings dwellings
© Copyright 2007 2007 © Copyright
DEPARTMENT OF OF STANDARDS STANDARDS MALAYSIA MALAYSIA DEPARTMENT
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The Department of Standards Malaysia (STANDARDS MALAYSIA) is the national standards of Malaysia. standards and and accreditation accreditation body body of Malaysia . of STANDARDS is to promote standard s, The main ction of The main fun function STANDARDS MALAYSIA MALAYSIA is to foster foster and and promote standards, standardisation and accreditation as a means of advancing the th e national economy, promoting efficiency and development, benefiting benefiti ng the promoting industrial industrial efficiency and development, the health health and and safety safety of of consu mers, faci litati ng domestic domestic and and international international trade trade and the public, public, protecting protecting the the the consumers, facilitating and fu rthering international cooperation in in relati on to standa rds and relation to standards and standardisation standardisation.. furthering international cooperation Malaysian Standards Standards (MS) (MS) are by comm ittees which Malaysian are developed developed through through consensus consensus by committees which producers,, users, consumers and others with comprise balanced balanced representation representation of of producers users, consumers and others with comprise relevant interests, interests, as as may may be be appropriate appropriate to to the the subject hand . To greatest relevant subject at at hand. To the the greatest Malaysian Standards aligned to or are are adoption adoption of international extent possible, possible, Malaysian Standards are are aligned to or of international extent a standard standa rd as Malaysian Standard is governed governed by by the standards. standards. Approval Approval of of a as a a Malaysian Standard is the of Malaysia Malaysia Act 1996 [Act 549]. Malaysian Standards are Standard s of Standards Act 1996 [Act 549]. Malaysian Standards are reviewed reviewed of Malaysian Malaysian Standards Standards is is voluntary voluntary except except in in so so far far as as they they are are periodically. The The use use of periodically. by-laws or made mandatory mandatory by by regulatory regulatory authorities authorities by by means means of lations,, local of regu regulations local by-laws or made any other other similar similar ways. ways. any
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MS1979:2007 1979:2007 MS
CONTENTS CONTENTS Page Page Committee representation """" ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, """,,,,,, """""" , ,,","""" Committee representation ............... "...................................................................
iviv
Forewo ,,,,,,,,,, ,,,,,,,,,, """",,, ,,, .. ,,,,,,,,,,,,,,,,,,, "."",,,., ""'"''''' ''''' """""" Forewordrd""""", ............................................................................................................... ''''
vv
Introduction ,,,,. ,,,,,,,,, ,.. """'" ..... ","'". "'"''''''' ''''''''''' '' " ..... " .. ,,, ... ,,,, .... "."." ... ,,,,, Introduction ......................................................................................................... .
1
Scope .... ,,, ..... ," ... ,, ... ".".,.,." ... " ". " .. "."."" " ........... "', ... " ... ,.... ", ...... " .. "" .... ,, .. ," Scope ...................................................................................................................
1
2 2
Normative references ."."""" ."""." ... "".".,,', , .... ,................. ,.,, ... ,..... ,.... " .. "." ...." Normative references .........................................................................................
1
3 3
Require ments ,,,, .. ,, .. ', ............ ,... ,, .......................... ,...... ,, .... ,,,' .. " ....... " .... ".",,, .. ,,.. Requirements ......................................................................................................
22
4 4
Issues addressed Issues addressed
4.1
General characteristics of electricity supply General characteristics of electricity supply COP ai, Characteristics of public electricity supply "" ............ " ... " ...... "" ............. COP 01, Characteristics of public electricity supply .......................................... COP 02, Suitability for use ............. "."" .. " .... " .... """" .... """" .. " .. "".".",, ..... ,,",,.. COP 02, Suitability for use ................................................................................... COP 03, Application for supply of electric ity" .. """""" .... """"" ....... ""." .. "" ... "" COP 03, Application for supply of electricity ....................................................... ..
22 22 22
4.2 4.2 4,2.1 4.2.1 4.2.2
Protection against electric shock Protection against electric shock COP 04, Protection against direct contact ............... ,................ , .. ,.. ,.. " .. ,,, ........ ,".. COP 04, Protection against direct contact ......................................................... COP 05, Earthing of equipment ......... " .............. " .... " .. " ......... " ......... " ... " .. "" ... .. COP 05, Earthing of equipment ......................................................................... COP 06, Isolation on fault .......... " ............ ""."" ........ "" .. "." ... " ....... "." .. ", .. ".,""... COP 06, Isolation on fault ................ " ................................................................. COP 07, Require ment of earthing system ... """ ....... " ....... """" ......... "."" ..... "."... COP 07, Requirement of earthing system ..........................................................
2 3 3 3
4.3 4.3 4.3.1
4.3.1 4.3.2 4.3.2 4.3,3 4.3.3
Protection against thermal effects Protection against thermal effects COP 08, Protection again fire"." """." .... "'''".,,' '''''''''''' '', ..... ,,'', COP 08, Protection again fire ............................................................................. ...... ,,'',, ....... ,,''''.. COP 09, Protection by placing out of reach" " ......... "" ...... "" .. "" ........ "." .... "",, ... COP 09, Protection by placing out of reach ......................................................... COP 10, Protection against overheating "." .. "".""" .. "" ......... "" ..... "." .. ",, ........ .. COP 10, Protection against overheating .............................................................
3 33 44
4.4 4.4 4.4,1 4.4.1 4.4.2 4.4.2 4.4.3 4.4.3 4.4.4 4.4.4 4.4.5 4.4.5 4.4.6 4.4.6 4.4.7 4.4.7
Overcurrent protection Overcurrent protection COP ii, Overcu rrent protection of phase conduc tors."" ........ "."'" .. " ... "",, ..... ,,.. COP 11, Overcurrent protection of phase conductors ......................................... COP 12, Cross section area of neutral conductors "" .. " ... "" .. "." .. "",",, ....... ,,"".. COP 12, Cross section area of neutral conductors ............................................ COP 13, Nominal current of protection devices ......... " .... " ...... " ... "." ....... ,,""'''''' . COP 13, Nominal current of protection devices ................................................... COP 14, Curren t carrying capacity of cable .. """ .......... ,,,.,,.,, ........ ,,.,, ........... ,, .. ,,.. COP 14, Current carrying capacity of cable ....................................................... COP is, Curren t to ensure effective operation of protective device ,................ .. COP 15, Current to ensure effective operation of protective device..................... COP 16, Determination of short circuit curren!.. ........ " ............ " ... ""."" ... " .. " .... " . COP 16, Determination of short circuit current... ................................................. COP 17, Rating of short circuit protective device " .... ,,, ............ ,,,,.,, ............. ,, .. "" . COP 17, Rating of short circuit protective device ................................................
44 44 44 44 44 55 55
4.5 4.5 4.5.1 4.5.1 4.5.2
4.5.2
Protection against voltage disturbance Protection against voltage disturbance COP 18, Commo n earthing system ","" .. ,""." ........ " ..... ' ......... " .................. "" .. .. . COP 18, Common earthing system ..................................................................... COP 19, Installation of SPD"" """." ... " ... """" .. " ... ".,,,.,,"' ,, .. ,,, .. ,,",, ... ,,,, ... , .. ,, ... . . COP 19, Installation of SPD .................................................................................
55 55
4.6 4.6 4.6.1 4.6.1 4.6.2 4.6.2 4.6.3 4.6.3 4.6.4 4.6.4
Wiring system s Wiring systems COP 20, Prevention of eddy current ...." ...... "" ......................... "" .. "".".". "" .. "". .. COP 20, Prevention of eddy current... ................................................................ COP 21, Separation of HV and LV cables .".""." .. " .. "" .. ".""." ...... ,,, .... ,, ... ,, .. ,, .. ,.. COP 21, Separation of HV and LV cables .......................................................... COP 22, Installation of three phase and single phase circuits .... " .... " ... "" ..... " .. COP 22, Installation of three phase and single phase circuits " .......................... COP 23, Connection of dissimilar metals ..... "" .... " .. """ .... " ... "., .. "" ... "."",, .. ,, .. , . COP 23, Connection of dissimilar metals ............................................................
66 66 66 66
oa
4.1 4.1.1 4.1.1 4.1.2 4.1.2 4.1.3 4.1.3
4.2.2 4,2.3 4.2.3 4,2.4 4.2.4
© STANDARDS MALAYSIA 2007 - All rights reserved © STANDARDS MALAYSIA 2007 - All rights reserved
MS 1979:2007 1979:2007 MS
CONTENTS (continued) (continued) CONTENTS Page Page
4.6.18 4.6.18 4.6.19 4.6.19 4.6.20 4.6.20 4.6.21 4.6.21 4.6.22 4.6.22
COP 24, Installation of conductors in buried cable ducts ................................... .. COP 24, Installation of conductors in buried cable ducts ................................... .. COP 25, Bending radius of cables ...................................................................... .. COP 25, Bending radius of cables ....................................................................... . COP 26, Support for vertical cables .................................................................... . COP 26, Support for vertical cables .................................................................... . COP 27, Space factor ........................................................................................... COP 27, Space factor ........................................................................................... COP 28, Cables installed behind walls ............................................................... .. COP 28, Cables installed behind walls ............................................................... .. COP 29, 29, Mechanical Mechanical protection protection for for cables cables within within walls walls ....................................... ...................................... ... COP COP 30, Cables installed within ceiling space ..................................................... . COP 30, Cables installed within ceiling space .................................................... .. COP 31, Water heater circuits ............................................................................ .. COP 31, Water heater circuits ............................................................................ .. COP 32, Air conditioner circuits .......................................................................... .. COP 32, Air conditioner circuits .......................................................................... .. COP 33, Group Group reduction reduction factors factors ....................................................................... ........................................................................... COP 33, COP 34, Consideration for loaded conductors .................................................... . COP 34, Consideration for loaded conductors ................................................... .. COP 35, 35, Size Size of of neutral neutral conductor conductor ...................................................................... ..................................................................... ... COP COP 36, Neutral conductor reduction at the discretion of Professional COP 36, Neutral conductor reduction at the discretion of Professional Design Electrical Engineer. .................................................................................. . Design Electrical Engineer. ................................................................................... COP 37, Phase conductors connected in parallel .............................................. .. COP 37, Phase conductors connected in parallel .............................................. .. COP 38, Cables suitable for the most onerous condition ................................... .. COP 38, Cables suitable for the most onerous condition ................................... .. COP 39, 39, Minimum Minimum size size of of wiring wiring conductors conductors ....................................................... ...................................................... ... COP COP 40, Neutral conductor for every circuit ........................................................ . COP 40, Neutral conductor for every circuit.. ...................................................... . COP 41, Allowable voltage drop .......................................................................... . COP 41, Allowable voltage drop ......................................................................... ..
4.7 4.7 4.7.1 4.7.1 4.7.2 4.7.2 4.7.3 4.7.3 4.7.4 4.7.4
Electrical connections connections Electrical COP 42, Soldered connections .......................................................................... .. COP 42, Soldered connections ............................................................................ COP 43, Use of sockets and crimps crimps for for connections connections ......................................... ............................................. COP 43, Use of sockets and COP 44, Cables for final sub-circuits .................................................................. COP 44, Cables for final sub-circuits ...................................................................... COP 45, 45, Sealing Sealing of of partitions partitions .............................................................................. ................................................................................ COP
4.8 4.8 4.8.1 4.8.1 4.8.2 4.8.2 4.8.3 4.8.3 4.8.4 4.8.4 4.8.5 4.8.5 4.8.6 4.8.6 4.8.7 4.8.7 4.8.8 4.8.8 4.8.9 4.8.9 4.8.10 4.8.10 4.8.11 4.8.11 4.8.12 4.8.12 4.8.13 4.8.13
Switching and and control control Switching COP 46, 46, Multi-pole Multi-pole switching switching devices devices ................................................................ .................................................................... COP COP 47, No MCB or fuse in a neutral conductor ............................................... ... COP 47, No MCB or fuse in a neutral conductor ................................................ COP 48, Operation of RCD ................................................................................. COP 48, Operation of RCD ................................................................................. .... COP 49, 49, Protective Protective conductor conductor of of aa circuit... circuit ............................................................ COP ........................................................ ... COP 50, 50, Current Current operated operated RCD RCD ........................................................................ ............................................................................ COP COP 51, 51, RCD RCD for for single single phase phase circuit circuit ................................................................ .................................................................. COP COP 52, RCD for three phase circuit ................................................................. COP 52, RCD for three phase circuit ..................................................................... COP 53, 53, RCD RCD for for hand hand held held equipment equipment ............................................................ ................................................................ COP COP 54, ReD for special places ....................................................................... COP 54, ReD for special places ....................................................................... .... COP 55, 55, Location Location of of RCD RCD .................................................................................. ...................................................................................... COP COP 56, Regular testing of RCD ...................................................................... .......................................................................... COP 56, Regular testing of RCD COP 57, Selection of short circuit protective device........................................... ............................................... COP 57, Selection of short circuit protective device COP 58, Requirement for devices for emergency switching ............................. ... COP 58, Requirement for devices for emergency switching ..............................
4.9 4.9 4.9.1 4.9.1 4.9.2 4.9.2 4.9.3 4.9.3 4.9.4 4.9.4
Surge protective protective devices devices Surge COP 59, Installation of SPD SPD ................................................................................ .................................................................................... COP 59, Installation of COP 60, 60, Use Use of of SPD SPD .......................................................................................... .............................................................................................. COP COP 61, 61, Rating Rating of of SPD SPD ....................................................................................... ......................................................................................... COP COP 62, Protection of electronic devices by by SPD SPD .............................................. .................................................. COP 62, Protection of electronic devices COP 63, Installation of SPD in special environments ......................................... ... COP 63, Installation of SPD in special environments .......................................... COP 64, 64, Earth Earth connection connection of of SPD SPD ...................................................................... .......................................................................... COP
4.6.5 4.6.5 4.6.6 4.6.6 4.6.7 4.6.7 4.6.8 4.6.8 4.6.9 4.6.9 4.6.10 4.6.10 4.6.11 4.6.11 4.6.12 4.6.12 4.6.13 4.6.13 4.6.14 4.6.14 4.6.15 4.6.15 4.6.16 4.6.16 4.6.17 4.6.17
4.9.5 4.9.5 4.9.6 4.9.6
ii
66 66 66 66 7 7
77 77 77 77 77 7 7 88
88
88 88 88 88 88 88 88 99 99
99 99 99 99 99 99 99
10 10
10 10 10 10 10 10 10 10 10 10 10 10 10 10 11 11 11 11 11 11
11 11
© STANDARDS MALAYSIA 2007 - All rights reserved © STANDARDS MALAYSIA 2007· All rights reserved
1979:2007 MS 1979:2007
CONTENTS (continued) Page Page
4.10 4.10.1 4.10.2 4.10.3 4.10.4
Isolation COP 65, COP 66, COP 67, COP 68,
Requirement for circuit isolation ............................................................ . Marking of isolation devices ................................................................ .... Prohibition on the use of semiconductor devices for isolation ............. . Prevention of unintentional re-energising ........................................... ..
11 11 11 11 11 11 11 11
4.11 4.11.1 4.11.2 4.11.3 4.11.4 4.11.5 4.11.6 4.11.7 4.11.8
Earthing COP 69, COP 70, COP 71, cap COP 72, COP 73, cop COP 74, COP 75, COP 76,
Uses of earthing system ..................................................................... .. Earth electrodes ................................................................................... . Restrictions on the use of water or gas pipes for earthing ................... . Maintenance of earthing system .......................................................... .. Minimum size of earthing conductors .................................................. ................................................. ... Methods of connecting earthing conductors conductors ........................................ ....................................... ... Selection of protective conductors ....................................................... . Size of protective conductors .............................................................. ..
11 11 11 11 12 12 12 12 12 12 12 12 12 12
4.12 Protective bonding conductor 4.12.1 COP 77, Size of protective bonding conductors .................................................. ......................... ............ .............
12 12
12 12
4.13 4.13.1
Change-over switch of a standby generating set COP 78, Prevention of parallel operation of standby standby system with the public supply.................................................................................................................... supply .................................................................................................................... ................. 4.13.2 COP 79, Separate neutral for the standby system ............................... ............................................ 4.13.3 COP 80, Overcurrent protection for essential services ................... .......... services ........... ......................................
13 13 13 13 13 13
4.14 4.14.1 4.14.2 4.14.3 4.14.4 4.14.5 4.14.6 4.14.7 4.14.8 4.14.9 4.14.10 4.14.11
13 13 13 13 13 13 13 13 13 14 14 14 14 14 14 14 14 14 14 14 14
Initial verification of installations COP 81, Initial inspection of installation .............................................................. COP 82, Supervision of work on LV single phase installations............................ installations ....... ..................... COP 83, Supervision of work on LV three phase installations ............................ ............... ....... ...... COP 84, Testing of work on LV single phase installations ........................ .... ............ ........ .......... COP 85, Testing of work on LV three phase installations ................................... COP 86, Testing by Electrical Services Engineer ............................................... COP 87, Condition precedent for receipt of electricity.. ............................. .......... electricity................. ........................ COP 88, Insulation tests on LV installations ........................................................ COP 89, Circuit checks ........................................................................................ COP 90, Requirement for labelling ...................................................................... COP 91, As-built diagrams .................................................................................. COP91,
© STANDARDS MALAYSIA 2007 - All rights reserved
iii
MS 1919:2001 1979:2007 MS
Committee representation representation Committee The Electrotechnical-1 Industry Standards Committee (ISC E-1) under whose authority this Malaysian Standard was The Electrotechnical-1 Industry Standards Committee (lSC E-1) under whose authority this Malaysian Standard was developed, comprises representatives from the following organisations: developed, comprises representatives from the following organisations: Association of Consulting Engineers Malaysia Association of Consulting Engineers Malaysia Department of Standards Malaysia Department of Standards Malaysia Federation of Malaysian Manufacturers Federation of Malaysian Manufacturers Independent Power Producer Independent Power Producer Jabatan Kerja Raya Malaysia Jabatan Kerja Raya Malaysia Kementerian Perdagangan Dalam Negeri dan Hal Ehwal Pengguna Kementerian Perdagangan Dalam Negeri dan Hal Ehwal Pengguna Malaysian Cable Manufacturers Association Malaysian Cable Manufacturers Association Malaysian Electrical Appliances and Distributors Association Malaysian Electrical Appliances and Distributors Association Ministry of International Trade and Industry Ministry of International Trade and Industry Persatuan Pengguna-Pengguna Standard Malaysia Persatuan Pengguna-Pengguna Standard Malaysia Pusat Tenaga Malaysia Pusat Tenaga Malaysia SIRIM QAS International Sdn Bhd (Electrotechnical Testing Section) SIRIM QAS International Sdn Bhd (Electrotechnical Testing Section) SIRIM QAS International Sdn Bhd (Product Certification Section) SIRIM QAS International Sdn Bhd (Product Certification Section) Suruhanjaya Komunikasi dan Multimedia Malaysia Suruhanjaya Komunikasi dan Multimedia Malaysia Suruhanjaya Tenaga Suruhanjaya Tenaga Tenaga Nasional Berhad Tenaga Nasional Berhad The Electrical and Electronics Association of Malaysia The Electrical and Electronics Association of Malaysia The Institution of Engineers, Malaysia The Institution of Engineers, Malaysia Universiti Teknologi Malaysia Universiti Teknologi Malaysia The Technical Committee on Electrical Installation, Protection and Insulation Practice which developed this The Technical Committee on Electrical Installation, Protection and Insulation Practice which developed this Malaysian Standard was managed by The Electrical and Electronics Association of Malaysia (TEEAM) in its capacity Malaysian Standard was managed by The Electrical and Electronics Association of Malaysia (TEEAM) in Its capacity as an authorised Standards-Writing Organisation and consists of representatives from the following organisations: as an authorised Standards-Writing Organisation and consists of representatives from the following organisations: Association of Consulting Engineers Malaysia Association of Consulting Engineers Malaysia EITA Holdings Holdings Sdn Sdn Bhd Bhd EITA G.H. Liew Engineering (1990) Sdn Bhd G.H. Liew Engineering (1990) Sdn Bhd Jabatan Bomba dan Penyelamat Malaysia Jabatan Bomba dan Penyelamat Malaysia Jabatan Kerja Kerja Rays Raya Malaysia Malaysia Jabatan Sabah Electricity Electricity Sdn Sdn Bhd Bhd Sabah Sarawak Electricity Electricity Supply Supply Corporation Corporation Sarawak SIRIM QAS QAS International International Sdn Sdn Bhd Bhd (Electrotechnical (Electrotechnical Testing Testing Section) Section) SIRIM Suruhanjaya Tenaga Tenaga Suruhanjaya The Electrical Electrical and and Electronics Electronics Association Association of of Malaysia Malaysia (Secretariat) (Secretariat) The The Institution Institution of of Engineers, Engineers, Malaysia Malaysia The Time Era Era Sdn Sdn Bhd Bhd Time TNB Distribution Distribution Division Division TNB Universiti Malaya Malaya Universiti Universiti Teknologi Teknologi Malaysia Malaysia Universiti
iv iv
© STANDARDS STANDARDS MALAYSIA MALAYSIA 2007 2007 - All All rights rights reserved reserved ©
MS 1979:2007
FOREWORD This Malaysian Standard was developed by the Technical Committee on Electrical Installation, Protection and Insulation Practice under the authority of the Electrotechnical Industry Standards Committee. Development of this standard was carried out by The Electrical and Electronics Association of Malaysia which is the Standards-Writing Organisation (SWO) appointed by SIRIM Berhad to develop standards for electrical installation, protection and insulation practice. This Standard is the result of the combined effort of TEEAM SWO operating as the Working Group and as the Chair of SIRIM's Technical Committee No. 10 (TC 10): Electrical of the the Installation, Protection and Insulation, overseeing the various stages of development of COP. More than 80 % of Malaysian electricity customers are domestic and residential installations electricity catering to uninformed consumers. On the other hand, less than 20 % of Malaysian electricity as whilst MS IEC 60364 as customers are either commercial or industrial consumers. Therefore, whilst for both the the a set of standards provides guidelines for the broad spectrum of LV installations, for the direction of informed as well as the uninformed consumers, this standard developed under the the regulatory body, however, deals with the safety of (uninformed) consumers. by electrical safety safety This standard provides for the relevant requirement as prescribed by consideration for consumers' protection of relevant technical considerations of the practices.
© STANDARDS MALAYSIA 2007 - All rights res6IVed reserved
v
MS 1979:2007 1979:2007 MS
ELECTRICAL INSTALLATIONS INSTALLATIONS OF OF BUILDINGS BUILDINGS -- CODE CODE OF OF PRACTICE PRACTICE ELECTRICAL O. O.
Introduction Introduction
This Malaysian Malaysian Standard Standard has has been been developed developed based based on on the the source source material material as as contained contained in in This the guide guide to to MS MS lEG lEG 60364 60364 on on electrical electrical installations installations of of buildings. buildings. the In stating the the safety safety requirements requirements for for (uninformed) (uninformed) consumers, consumers, this this standard standard articulates articulates the the In stating practices relating relating to to electrical electrical installations installations of of buildings buildings for for residential residential houses houses and and dwellings. dwellings. practices Furthermore, this this standard standard also also addresses addresses certain certain instances instances where where and and when when other other forms forms of of Furthermore, low voltage voltage (LV) (LV) electrical electrical installations installations have have impact impact upon upon the the safety safety requirements requirements for for low uninformed persons; persons; as as long long as as the the LV LV public public electricity electricity supply supply is is of of the the TT TT system system and and the the uninformed installation is is not not in in contradiction contradiction to to the the dictates dictates of of the the professional professional design design electrical electrical engineer. engineer. installation of code code of of practices practices constitute constitute this this standard standard with with each each practice practice having having its its Ninety one one numbers numbers of Ninety own discreet reference number. The chronological appearance of the listing of practices own discreet reference number. The chronological appearance of the listing of practices generally follows follows the the flow flow of of the the fourteen fourteen issues issues as as addressed addressed in in the the guide guide of of MS MS lEG lEG 60364 60364 generally on electrical electrical installations installations of of buildings. buildings. on Each code code of of practice practice is is a a concise concise statement statement of of the the relevant relevant requirement requirement as as prescribed prescribed by by Each as is is the the Malaysian Malaysian industrial industrial norm norm electrical safety safety consideration consideration for for consumers' consumers' protection; protection; as electrical and per per the the law. law. and
1.
Scope
in This Malaysian Standard has been developed based on the source material as contained in the guide guide to to MS MS lEG lEG 60364 60364 on on electrical electrical installations installations of of buildings. buildings. the
This Malaysian Standard provides the requirement for LV electrical installations of buildings such as as residential residential houses houses and and dwellings, dwellings, and and in in certain certain circumstances, circumstances, where where and and when when such similarities exist, exist, to to those those in in commercial commercial and and industrial industrial installations. installations. similarities For electrical installations, other than those for residential houses and dwellings where the deSign of the the electrical electrical installations installations will will be be carried carried out out by by professional professional design design electrical electrical design of and applicable applicable sections sections in in MS MS lEG lEG 60364 60364 will will engineers for for informed informed consumers, consumers, the the relevant relevant and engineers prevail in accordance to professional judgment.
2.
Normative references
The following normative references are indispensable for the application of this standard. For dated references, only the edition cited applied. For undated references, the latest edition of of the normative reference (including any amendments) applies. Guide to MS lEG 60364 on Electrical Installations of Buildings
Electricity Supply Act 1990 - Act 447 Electricity Regulations 1994
© STANDARDS STANDARDS MALAYSIA MALAYSIA 2007 2007 - All rights reserved reserved © All rights
007 MS MS1979:2 1979:2007
3.3.
ireme nts Requ Requirements
standard conform to those as prescribed in the ed inin this ments as The The require requirements as develop developed this standard conform tions to those prescribed in the s those section 1994,asand the Electricity Regula ity Supply Electric Electricity SupplyAct Act1990 1990- -Act Act447 447and and the Electricity Regulations 1994, and those sections 60364. lEG MS in d specifie s as ian practice and andparts partssuitable suitablefor forMalays Malaysian practices as specified in MS IEC 60364.
4. 4.
ssed s addre Issue Issues addressed
4.1 4.1
ity supply teristic s of l charac Genera General characteristics ofelectric electricity supply
tions for residential buildings and dwellings receive the al installa ian electric Almost Almost all all Malays Malaysian electrical installations for residential buildings and dwellings receive the ity supply LV LV supply supply from from the the electric electricity supply body. body.
electric ity supply teristic s of COP COP 01, 01, Charac Characteristics of public public electricity supply
4.1.1 4.1.1
g characteristics: ity supply The The public public electric electricity supply has has the the followin following characteristics: Voltage Voltage::
240 240 Va.c. Va.c. for for single single phase phase system system phase three for a.c. V 415 415 V a.c. for three phase 4-wire 4-wire system system n is Variatio Variation is + + 55 % % and and -- 10 10 % %
Frequency: Frequency:
1% ±1 50 Hz 50 Hz ± %
to establish his own earth) has to user has (the user -system (the TT-system system: TT Wiring system: establish his own earth)
4.1.2
use for use Suitab ility for 02, Suitability COP 02, COP
suitable for use under the conditions as stated in be suitable shall be selected shall equipment selected electrical equipment All electrical All for use under the conditions as stated in (see4.1 .1). COP01 (see4.1.1). COP01 4.1.3 4.1.3
electric ity of electricity supply of for supply Applic ation for 03, Application COP 03, COP
24 of the Electricity Supply Act 1990 as well as Section 24 under Section requirement under the requirement to the Pursuant to Pursuant of the Electricity Supply Act 1990 as well as requiring a supply of electricity shall make an person requiring licensee, aa person the licensee, of the guidelines of other guidelines any other any a supply ofpremise electricity shall make ity electrican s where the location of the stating the licensee, stating respective licensee, the respective to the application to application location of the premises where electricity the given, be to which the supply is required for which period for minimum period the minimum required, the supply isis required, supply the supply is required to be given, the commencement of supply. The licensee shall of date the and d require demand m maximu demand required and the date of commencement maximum of supply. The licensee shall the applicable tariff, payment for acceptable, the application isis acceptable, the application that the writing that confirm inin writing confirm applicable tariff, payment for of the ESA 1990, if any, and amount of security (1) of 27 (1) section 27 under section incurred under expenses incurred expenses the ESA 1990, if any, and amount of security the licensee and approved by the regulatory by the required by documentation required any documentation and any required and required licensee and approved by the regulatory commences. workcommences. beforework bodybefore body 4.2 4.2
shock electricshock agains telectric Protec tionagainst Protection
indirect contact. In practice direct contact contactororindirect directcontact from direct arise from can arise shockcan Electric shock Electric contact. In practice direct contact live conductor. barelive touchesaabare persontouches whenaaperson occurswhen usuallyoccurs usually conductor. 4.2.1 4.2.1
contac t directcontact agains tdirect Protec tionagainst 04,Protection COP04, COP
the wiring system shall be insulated conductorsininthe liveconductors contact,allalllive directcontact, againstdirect protectagainst Toprotect To wiring system shall be insulated cross linked polyeth ylene (PVC) chloride vinyl poly as suchas poly vinyl chloride (PVC) ororcross mediumsuch dielectricmedium witha adielectric with linked polyethylene of barriers or use the by against direct contact protectagainst measurestotoprotect Supplementarymeasures (XLPE). Supplementary (XLPE). direct contact by the use of barriers or aged. encour are reach outofofreach conductorsout liveconductors placinglive andplacing enclosuresand enclosures are encouraged.
22
© STANDARDS MALAYSIA 2007 - All rights reserved © STANDARDS MALAYSIA 2007 - All rights reserved
MS 1979:2007
4.2.2
COP 05, Earthing of equipment
All metal enclosures of electrical equipment shall be earthed (connected to a protective and the the conductor). In addition, water and gas pipes, structural metal parts of the building and ducting of the air conditioning system shall also be connected to the main equipotential ducling bonding. Take note of COP 71 on equipotential bonding.
4.2.3
COP 06, Isolation on fault
In case of a fault between a live conductor and the metal enclosure of electrical equipment, the fault shall be isolated by a circuit breaker, fuse or residual current device (RCD). Protection against electric shock requires the fulfillment of the condition
RA x la ::; 50 V where, la
RA 4.2.4
(llln in the case of RCD) and the 5 s is the operating current of the protective device (IAn having an inverse time characteristic; and operating current for overcurrent devices having
and protective conductor. conductor, is the resistance of the earth electrode and
COP 07, Requirement of earthing system
The primary requirement of the earthing system is to to ensure ensure effective operation of of the the circuit circuit device, the the resistance resistance of of the the protective device. For effective operation of the circuit protective device, installations where RCDs are are used used as as the earthing system shall be as low as possible. In installations circuit protective device, earthing resistance of less than 10 Q will generally ensure effective operation of the RCDs. However earthing resistance of less than 1 Q is the target.
4.3
Protection against thermal effects
There are three factors to be considered when applied to protection against thermal effects: a)
protection against fire;
b)
and protection against burns; and
c)
overheating, protection against overheating.
4.3.1
COP 08, Protection against fire
electrical equipment equipment that produces produces heat shall shall be To protect against fires, as a minimum, electrical materials that can withstand the temperatures produced. produced. In operation, operation, the the mounted within materials malerial shall be less less than 55°C (if the material material is is metalliC) metallic) or or temperature attained by the material non-metallic), 65 °c (if the material is non-metallic).
4.3.2
COP 09, Protection by placing out of reach
they are are within within arm's arm's reach reach Electrical equipment intended to be operated in such a way that they persons, If this this condition condition is not not assured, assured, shall not attain temperatures likely to cause burns to persons. put behind aa guard. the electrical equipment shall be put 2007 - All All rights reserved reserved © STANDARDS MALAYSIA 2007
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MS 1979:2007 1979 :2007 MS
4.3.3 4.3.3
COP 10, Protection against overheating COP 10, Protection against overheating
Forced air air heating heating system system and and appliances appliances producing producing hot hot water water or or steam steam shall shall be be equipped equipped Forced with devices to protect against overheating. with devices to protect against overheating. .' 4.4 4.4
Overcurrent protection Overcurrent protection
Overcurrent in a conductor causes a temperature rise which may result in a fire. Overcurrent in a conductor causes a temperature rise which may result in a fire. 4.4.1 4.4.1
COP 11, 11, Overcurrent Overcurrent protection protection of of phase phase conductors conductors COP
Overcurrent protection shall be provided for all phase conductors. Overcurrent protection shall be provided for all phase conductors. 4.4.2 4.4.2
COP 12, 12, Cross Cross section section area area of of neutral neutral conductor conductor COP
as the the phase phase conductor conductor also also The neutral neutral conductor conductor shall shall have have the the same same cross-sectional cross-sectional area area as The refer to COP 35 (see 4.6.16). refer to COP 35 (see 4.6.16). 4.4.3 4.4.3
COP 13, 13, Nominal Nominal current current of of protection protection device device COP
(In) shall shall be be greater greater than than the the design design current current (Ia). (Is). The nominal nominal current current of of the the protective protective device device (In) The In>
'8
4.4.4 4.4.4
COP 14, 14, Current Current carrying carrying capacity capacity of of cable cable COP
of the the cable cable (lz) (lz) shall shall be be greater greater than than the the nominal nominal The continuous continuous current current carrying carrying capacity capacity of The current of the protective device (In). current of the protective device (In).
4.4.5 4.4.5
COP is, 15, Current Current to to ensure ensure effective effective operation operation of of protective protective device device COP
In addition addition to to COP COP 14, 14, the the current current to to ensure ensure effective effective operation operation of of the the protective protective device device (/2) (/2) In must be less than 145 % of the current carrying capacity of the cable. In other words, the must be less than 145 % of the current carrying capacity of the cable. In other words, the protective device device must must operate operate before before the the conductor conductor is is overloaded overloaded by by 45 45 %. %. protective
12 < 1.45/z EXAMPLE EXAMPLE
Is Is
:=13.1A 13.1A
Choose In := 30 A Choose In 30 A
=
2
Try a solution using 10 mm 2 PVC cable. Assuming no derating effects, Try a solution using 10 mm PVC cable. Assuming no derating effects,
'.Iz
=52 52 A = A
1.45/z = 75.4 A 1.45 = 75.4 A
'z
The 30 A MCB must operate before the current reaches 75.4 A. The 30 A MCB must operate before the current reaches 75.4 A.
44
© STANDARDS MALAYSIA 2007 - All rights reserved © STANDARDS MALAYSIA 2007 - All rights reserved
MS 1979:2007 1979:2007 MS 4.4.6 4.4.6
COP 16, 16, Determination Determination of of short short circuit circuit current current COP
In order order to to design design short short circuit circuit protection protection properly, properly, the the short short circuit circuit current current at at every every relevant relevant In the installation installation shall shall be be determined. determined. The The short short circuit circuit current current can can be be obtained obtained by by part of of the part calculation or or by by measurement measurement of of the the impedances impedances at at the the relevant relevant points. points. Upon Upon request request the the calculation electricity supply supply body body shall shall provide provide the the short short circuit circuit current current at at the the point point of of common common coupling coupling electricity the utility's installation. with with the utility's installation. 4.4.7 4.4.7
COP 17, 17, Rating Rating of of short short circuit circuit protective protective device device COP
The short short circuit circuit protective protective device device shall shall have have aa short short circuit circuit breaking breaking capacity capacity not not less less than than The the prospective prospective short short circuit circuit current current at at the the place place of of installation. installation. the 4.5 4.5
Protection against against voltage voltage disturbance disturbance Protection
Voltage disturbance disturbance in in the the LV LV system system can can be be caused caused by by many many factors factors such such as as the the fol/owing: following: Voltage a) a)
earth fault fault in in the the LV LV system; system; earth
b) b)
loss of of neutral neutral in in TT TT system; system; loss
c) c)
short circuit circuit in in the the LV LV system; system; short
d) d)
lightning; and and lightning;
e) e)
switching. switching.
4.5.1 4.5.1
COP 18, 18, Common Common earthing earthing system system COP
There shall shall be be one one earthing earthing system system for for the the installation installation to to which which shall shall be be connected connected the the There following: following: a) a)
earth electrodes; electrodes; earth
b) b)
transformer tanks; tanks; transformer
c) c)
armouring of of cables; cables; armouring
d) d)
earth wires wires of of the the high high voltage voltage (HV) (HV) system; system; earth
e) e)
neutral of of the the LV LV system; system; neutral
f)f)
HV and and LV LV switchboard switchboard panels; panels; HV
g) g)
other metal parts e.g. e.g. equipment equipment control control panels, panels, structural structural steel steel works; works; and and other metal parts
h) h)
steel bars bars in in reinforced reinforced concrete concrete foundations. foundations. steel
Take note note of of COP COP 70 70 (see (see 4.11.2). 4.11.2). Take 4.5.2 4.5.2
COP 19, 19, Installation Installation of of SPD SPD COP
Where an an installation installation is is supplied supplied from from overhead overhead lines, lines, itit is is recommended recommended to to install install surge surge Where protective device device (SPD). (SPD). protective Take note note of of COP COP 59 59 (see (see 4.9.1). 4.9.1). Take © STANDARDS STANDARDS MALAYSIA MALAYSIA 2007 2007 -- All All rights rights reselVed reserved ©
55
MS 1979:2007 1979:2007 MS
4.6 4.6 4.6.1 4.6.1
Wiring Systems Systems Wiring COP 20, 20, Prevention Prevention of of eddy eddy current current COP
When single single core core power power cables cables are are to to be be terminated terminated in in metal metal switchboards, switchboards, ensure ensure that that all all the the When phase and neutral neutral conductors conductors are are within within the the switchboard switchboard so so as as to to prevent prevent eddy eddy current current phase and be achieved, achieved, the the part part of of the the switchboard switchboard where where the the single single core core cables cables heating. If this this cannot cannot be heating. If are terminated shall shall be be made made of of non-ferrous non-ferrous materials materials e.g. e.g. hard hard fibre fibre board, board, aluminium, aluminium, brass, brass, are terminated etc. etc.
4.6.2 4.6.2
COP 21, 21, Separation Separation of of HV HV and and LV LV cables cables COP
HV and and LV LV cables cables shall shall not not be be installed installed within within the the same same trunking trunking nor nor run run on on the the same same cable cable HV tray. tray.
4.6.3 4.6.3
COP 22, 22, Installation Installation of of three three phase phase and and single single phase phase circuits circuits COP
Three phase phase and and single single phase phase circuits circuits LV LV power power cables cables may may be be installed installed within within the the same same Three conduit or or trunking. trunking. conduit
4.6.4
COP 23, Connection of dissimilar metals
When a a connection connection is is made made between between dissimilar dissimilar metals metals e.g. e.g. copper copper to to aluminium, aluminium, precautions precautions When environment where there is is water, the more more shall be taken to avoid electrolytic effect. In an environment noble metal (in this case copper) shall be installed in such a way that it is below the less noble metal (aluminium in this case) when considered in the direction of the flow of water. Specially be used used to to connect connect dissimilar dissimilar conductors conductors e.g. e.g. copper copper and and made bimetallic bimetallic connectors connectors shall shall be made aluminium.
4.6.5
COP 24, Installation of conductors in buried cable ducts
Conduits or cable duct systems intended to be buried in structures shall be completely erected for each circuit before any insulated conductor is drawn in. 4.6.6
COP 25, Bending radius of cables
The radius of every bend in the wiring system shall be sufficiently large to prevent damage to to radius of 12 times the diameter diameter of of the the the cables. For common wiring installations, a bending radius order to satisfy this criterion, criterion, elbows elbows and and junction junction cable would normally be adequate. In order direction. boxes shall be included at places where the cable run changes direction, 4.6.7
COP 26, Support for vertical cables
damaged by by When cables of large cross-section areas are installed vertically, they may be damaged supported at at regular intervals intervals of of 1 m m by by their own weight. Hence they shall be adequately supported cable clamps or cable ties. 4.6.8
COP 27, Space factor
When cables are installed within conduits, a space factor of of 40 % % shall shall be be maintained. maintained. When When a cable trunking is used, the space factor shall be 45 %.
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STANDARDS MALAYSIA MALAYSIA 2007 2007 - All rights rights reserved reserved © STANDARDS
MS 1979:2007
of cables cables (including (including insulation) insulation) Space factor = Sum of cross section areas of Internal cross cross section area of conduitltrunking conduitltrunking
4.6.9
COP 28, Cables installed behind walls
shall be installed installed horizontally horizontally or or vertically vertically Where cables are installed buried behind walls, they shall i.e. parallel to the edges of the room. Subject to the dimensions of of the columns columns and and beams, beams, Le. of the the wall. wall. they shall be within 150 mm from the top of the walls and 150 mm from the edge of
4.6.10
COP 29, Mechanical protection for cables within walls
mechanical protection protection such such as as aa conduit. conduit. Cables installed within walls shall be provided with mechanical allowed. Direct installation of cables within walls is not allowed,
4.6.11
COP 30, Cables installed within ceiling space
ceiling space under the the roof, Where cables are installed behind suspended ceilings or the ceiling approved they shall be provided with mechanical protection such as being installed within approved conduits. In addition they shall be installed either parallel or perpendicular to the edges of of the the walls.
4.6.12
COP 31, Water heater circuits cop
installed at at aa A circuit intended to supply a water heater shall have a double pole switch installed outlet (an (an suitable location. In the vicinity of the water heater, there shall be a socket outlet unswitched type is acceptable) to facilitate the connection of the circuit to the apparatus and to facilitate disconnection during maintenance.
4.6.13
COP 32, Air conditioner circuits cop
A circuit intended to supply an air conditioner shall have a socket outlet (an unswitched type is acceptable) in the vicinity of the air conditioner to facilitate the connection of of the circuit circuit to to the apparatus and to facilitate disconnection during maintenance.
4.6.14
COP 33, Group reduction factors
When groups of cables are run together, a group reduction factor shall be applied to take into account the heat generated by the loaded cables. Take note of COP 08 for protection against fire. Take note of COP 21 for separation of HV and LV cables.
4.6.15
COP 34, Consideration for loaded conductors
that carry When considering the number of loaded conductors, only the conductors in a circuit that load shall be considered. Hence the neutral conductor of a balanced three phase circuit need not be considered.
© STANDARDS MALAYSIA 2007 - All rights reserved
7
2007 MS MS1979: 1979:2007
ctor l condu COP 35,Size Sizeof ofneutra neutral conductor COP35,
4.6.16 4.6.16
ent that have their own power supplies, harmonic ic equipm ing use With Withthe theincreas increasing useofofelectron electronic equipment that have their own power supplies, harmonic the neutral conductor to carry current. To cater for s will s ininthree current currents threephase phasesystem systems willcause cause the neutral conductor tor to carry current. To shall cater be for system in wiring of the neutral conduc m, the this thisneutral neutralcurrent, current, as asaaminimu minimum, the size size of the neutrai conductor in wiring system shall be refer to COP 12 (see 4.4.2). tors: Also the thesame sameas asthe thephase phaseconduc conductors: Also refer to COP 12 (see 4.4.2), on at the discret ion of Profes sional Design ctor reducti l condu COP 4.6.17 4.6.17 COP 36, 36, Neutra Neutral conductor reduction at the discretion of Professional Design er al Engine Electric Electrical Engineer ional design electrical engineer may reduce the size of standing COP Notwith Notwithstanding COP 35, 35, the the profess professional design electrical engineer may reduce the size of rmer and the main SWitchboard after taking into n the tors betwee the the neutral neutral conduc conductors between the transfo transformer and the main switchboard after taking into ar electrical installation. ments of t the accoun account the require requirements of the the particul particular electrical installation. ted in parallel tors connec COP COP 37, 37, Phase Phase conduc conductors connected in parallel
4.6.18 4.6.18
ted in parallel in the same phase. (This is especially tors may Two Two or or more more conduc conductors may be be connec connected in parallel in the of same phase. (This is especially tor may conduc large a single is high and the use ns when so so in in situatio situations when the the load load current current is high and the use of a single large conductor the s may improve tion installa of type this , Further tion. ies during presen presentt difficult difficulties during installa installation. Further, this type of installation improves the circuit). tibility (EMC) agnetic compa electrom electromagnetic compatibility (EMC) of of the the circuit), the most onerou s condit ion for the e for COP COP 38, 38, Cable Cable suitabl suitable most onerous condition
4.6.19
installation conditions that have different heat different installation of different consist of may consist route may A cable cable route conditions that have different heat capacity of the cable shall be selected based on carrying capacity current carrying The current properties. The diSSipation properties. dissipation of the cable shall be selected based on the cable route. along the encountered along condition encountered onerous condition most onerous the most cable route. 4.6.20
conduc tors wiring conductors of wiring size of Minimu m size 39, Minimum COP 39, COP
conductors used for wiring purposes shall be 1.5 live conductors of live areas of sectional areas cross sectional minimum cross The minimum The used for wiring purposes shall be 1.5 2 2 2 2 um. alumini mm aluminium. 2.5 mm or 2.5 copper or mm copper mm 4.6.21 4.6.21
circuit every circuit for every condu ctor for Neutra l conductor 40, Neutral COP 40, COP
conductor which shall be clearly identifiable neutral conductor separate neutral be aaseparate shall be there shall circuit there every circuit For every For which shall be clearly identifiable arranged in the same order as the circuits. and arranged unitand consumer unit orconsumer board or distribution board the distribution at the at in the same order as the circuits. 4.6.22 4.6.22
drop voltagedrop Allowa blevoltage 41, Allowable COP 41, COP
consumer's installation and the equipment shall the consumer's of the origin of the origin between the drop between voltage drop The voltage The installation and the equipment shall installation. Voltage drops during temporary the installation. voltage ofof the nominal voltage the nominal %ofof the exceed 44 % not exceed not Voltage drops during temporary exempted from this requirement. For most be exempted may be starting may motor starting as motor such as conditions such conditions from be thisaccepta requirement. For most ble. motor starting may duringmotor 10%%during dropofof10 voltagedrop installations, aavoltage installations, starting may be acceptable. 4.7 4.7 4.7.1 4.7.1
connec tions Electric alconnections Electrical connec tions Solder edconnections 42,Soldered COP42, COP
conductors or to terminate conductors. connectconductors usedtotoconnect beused notbe shallnot connectionsshall Solderedconnections Soldered or to terminate conductors. 4.7.2 4.7.2
for connec tions crimpsfor andcrimps socket sand Useofofsockets 43,Use COP43, connections COP
shall be made by sockets and crimping. conductorsshall lengthsofofconductors twolengths betweentwo Connectionsbetween Connections be made by sockets and crimping.
88
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© STANDARDS MALAYSIA 2007 All rights reserved
MS 1979:2007
4.7.3
COP 44, Cables for final sub-circuits subwcircuits
Cables used in final final sUb-circuits sub-circuits in LV installations shall not be joined.
4.7.4
COP 45, Sealing of partitions
Where Where aa wiring wiring system system passes through walls, floors, partitions etc in a building, the openings shall shall be be sealed sealed with with fire fire retardant retardant compounds. If the wiring system includes conduits or cable trunking, trunking, then in in addition addition to to the the above, the internal of the conduit or cable trunking shall also be be sealed sealed with with fire fire retardant compounds. compounds.
4.8 4.8.1 4.8.1
Switching and Control COP COP 46, Multi.pole Multi-pole switching devices
All All poles poles of of aa multi-pole multi-pole circuit circuit breaker or disconnector shall operate together. together. The contact for the the neutral neutral may may close close before before and and open after after the the phase phase contacts.
4.8.2 4.8.2
COP 47, 47, No MCB MCB or fuse fuse in a neutral conductor
A A miniature miniature circuit circuit breaker breaker (MCB) (MCB) or or fuse fuse shall shall not be be inserted inserted in the the neutral neutral conductor of a three three phase phase or or aa single single phase phase circuit. circuit.
4.8.3 4.8.3
COP COP 48, 48, Operation Operation of of RCD
In In operation, operation, aa RCD ReO shall shall ensure ensure the the disconnection disconnection of of all all live live conductors conductors in in the the circuit protected. protected.
4.8.4 4.8.4
COP COP 49, 49, Protective Protective conductor conductor of of a circuit circuit
The The protective protective conductor conductor (or (or earth earth wire) wire) of of aa circuit circuit shall shall not not pass pass through through the the magnetic magnetic circuit of of an an RCD. ReO.
4.8.5 4.8.5
COP COP 50, 50, Current Current operated operated RCD RCD
RCD Reo shall shall be be of of the the current current operated operated type; type; earth earth leakage leakage circuit circuit breaker breaker (ELCB) (ELCB) of of the the voltage voltage operated operated type type shall shall not not be be used. used.
4.8.6 4.8.6
COP COP 51, 51, RCD RCD for for single single phase phase circuit circuit
RCDs RCDs for for single single phase phase installations installations shall shall have have rated rated residual residual operating operating current current not not exceeding exceeding 100 100 mA. rnA.
4.8.7 4.8.7
COP COP 52, 52, RCD ReO for for three three phase phase circuit circuit
RCDs ReDs for for three three phase phase systems systems shall shall have have rated rated residual residual operating operating current current not not exceeding exceeding 100 mA. mA. Provided Provided there there are are no no three three phase phase loads loads in in the the installation, installation, itit is is recommended recommended to to 100 install three three single single phase phase RCD ReD instead instead of of aa three three phase phase RCD RCD in in aa three three phase phase installation. installation. install This practice practice will will reduce reduce the the extent extent of of power power disruption disruption in in the the installation installation in in case case there there is is aa This fault fault in in one one phase. phase.
© STANDARDS STANDARDS MALAYSIA MAlAYSIA 2007· 2007· All All rights rights reserved reserved ©
99
MS 1979:2007
4.8.8 4.8.8
COP 53, 53, RCD RCO for for hand hand held held equipment equipment COP
RCDs with rated residual residual operating operating current current not not exceeding exceeding 30 30 mA mA shall shall be be installed installed in in RCDs with rated installations where hand held held equipment equipment (generally (generally power power tools) tools) is is used. used. installations where hand
4.8.9 4.8.9
COP 54, 54, RCD RCO for for special special places places COP
10 mA mA shall shall be be installed installed in in the the RCDs with with rated rated residual residual operating operating current current not not exceeding exceeding 10 RCDs following instances: following instances:
a)
in places of public entertainment;
b) b)
where the the floor floor is is likely likely to to be be wet; wet; and and where
c) c)
for the the protection protection of of electric electric water water heaters. heaters. for
4.8.10
COP 55, Location Location of of RCD RCO COP
is protected protected by by a a single single RCD, RCD, itit shall shall be be located located at at the the origin origin of of the the If an an installation installation is If installation. installation.
4.8.11
COP 56, Regular testing of RCD
An installation protected by an RCD shall be tested at least two times a year to ensure its proper operation. operation. The The test test shall shall be be carried carried out out in in accordance accordance to to the the manufacturers' manufacturers' proper recommendations or by the use of RCD testing equipment approved for this purpose.
4.8.12
device COP 57, Selection of short circuit protective device
circuit Selection of a short circuit protective device shall be based on its rated service short circuit breaking capacity instead of its ultimate short circuit breaking capacity, capacity.
4.8.13
COP 58, Requirement for devices for emergency switching
Devices for emergency switching shall be red in colour and clearly identified. identified. They They shall be be of of the latching type or restrained in the "STOP" position. When released, the emergency switching device shall not re-energise the installation.
4.9 4.9.1
Surge Protective Devices COP 59, Installation of SPD SPO
To protect against lightning surges or overvoltage surges, it is recommended to install a surge recommended to be be protective device (SPD) near the origin of the installation. The SPD is recommended RCD (on the supply side). installed before the RCO Take note of COP 19 (see 4.5.2) on installing SPO SPD for electricity supply fed fed from from overhead overhead lines.
4.9.2
SPD COP 60, Use of gPD
SPD shall be be at least 1,1 1.1 Vo Va where Vo Va isis The maximum continuous operating voltage Vc of the SPO neutralvoltage of the the LV installation which which is commonly 240 Va.c.Va.c. the line to neutraLvoltage
10
© STANDARDS STANDARDS MALAYSIA MALAYSIA 2007 2007 -- All All rights rights reserved reserved ©
MS 1979:2007 1979:2007 MS
4.9.3 4.9.3
COP 61. 61, Rating Rating of of gPO SPO COP
The nominal nominal discharge discharge current current In In of of the the SPO SPD shall shall not not be be less less than than 55 kA. kA. The 4.9.4 4.9.4
COP 62, 62, Protection Protection of of electronic electronic devices devices by by gPO SPO COP
Additional SPO SPD is is recommended recommended to to be be installed installed near near sensitive sensitive electronic electronic equipment. equipment. Additional 4.9.5 4.9.5
COP 63, 63, Installation Installation of of gPO SPO in in special special environments environments COP
SPD installed installed in in environments environments where where there there is is aa risk risk of of fire fire (category (category BE2) BE2) or or risk risk of of explosion explosion SPO be appropriately appropriately protected protected to to prevent prevent this this risk. risk. (category BE3) BE3) shall shall be (category 4.9.6 4.9.6
of gPO SPO COP 64, 64, Earth Earth connection connection of COP
For SPOs SPDs to to function function properly properly an an effective effective connection connection to to earth earth is is essential. essential. The The minimum minimum For cross section section area area of of the the conductor conductor connecting connecting the the SPO SPO to to the the main main earthing earthing terminal terminal shall shall be be cross 2 2 copper. The connection shall be as short as possible (not more than 0.5 m). 10 mm 10 mm copper. The connection shall be as short as possible (not more than 0.5 m). 4.10 4.10 4.10.1 4.10.1
Isolation Isolation COP 65, 65, Requirement Requirement for for circuit circuit isolation isolation COP
the live live supply supply Every circuit circuit shall shall be be provided provided with with aa means means of of isolation isolation from from each each of of the Every conductors of the source of supply. conductors of the source of supply. 4.10.2 4.10.2
COP 66, 66, Marking Marking of of isolation isolation devices devices COP
The isolation isolation devices devices e.g. e.g. MCB MCB shall shall have have markings markings to to indicate indicate that that the the contacts contacts are are open open The or '0'). (OFF (OFF or '0'). 4.10.3 4.10.3
67, Prohibition Prohibition on on the the use use of of semiconductor semiconductor devices devices for for isolation isolation COP 67, COP
be used used for for isolation. isolation. Semiconductor devices devices shall shall not not be Semiconductor 4.10.4 4.10.4
COP 68, 68, Prevention Prevention of of unintentional unintentional re-energising re-energising COP
be provided provided to to prevent prevent electrically electrically operated operated equipment equipment from from being being unintentionally unintentionally Means shall shall be Means re-energised during during maintenance maintenance by by padlocking, padlocking, warning warning notices notices or or installation installation within within lockable lockable re-energised enclosures. enclosures. 4.11 4.11 4.11.1 4.11.1
Earthing Earthing COP 69, 69, Uses Uses of of earthing earthing system system COP
or itit may may also also serve serve other other The earthing earthing system system may may be be used used solely solely for for protective protective purpose purpose or The as the the reference reference earth earth for for electronic electronic systems, systems, including including ICT ICT functional purposes purposes e.g. e.g. as functional purposes. purposes. 4.11.2 4.11.2
COP 70, 70, Earth Earth electrodes electrodes COP
Earth electrodes electrodes may may be be established established using using round round copper copper sheathed sheathed steel steel rods, rods, copper copper tapes tapes or or Earth conductors, rods or pipes or steel bars in reinforced concrete foundations of buildings. conductors, rods or pipes o~ steel bars in reinforced concrete foundations of buildings. © STANDARDS STANDARDS MALAYSIA MALAYSIA 2007 2007 -- All All rights rights reserved reserved ©
11 11
MS 1979:2007 1979:2007 MS
Wherever reinforced reinforced concrete concrete pile pile foundations foundations exist, exist, they they shall shall be be incorporated incorporated into into the the Wherever building's earthing system. building's earthing system. Take note note of of COP COP 18 18 (see (see 4.5.1) 4.5.1) for for one one common common earthing earthing system. system. Take
4.11.3 4.11.3
COP 71, 71, Restrictions Restrictions on on the the use use of of water water or or gas gas pipes pipes for for earthing earthing COP
Water pipes pipes or or gas gas pipes pipes shall shall not not be be used used as as the the sole sale means means of of earthing earthing but but protective protective Water to these these pipes pipes is is permitted. permitted. equipotential bonding bonding to equipotential Take note note of of CO COP 05 on on earthing earthing of of water water pipes pipes and and gas gas pipes. pipes. P 05 Take 4.11.4 4.11.4
COP 72, 72, Maintenance Maintenance of of earthing earthing system system COP
be effectively effectively maintained maintained and and checked checked The earthing earthing system system of of electrical electrical installations installations shall shall be The annually. annually.
4.11.5 4.11.5
COP 73, 73, Minimum Minimum size size of of earthing earthing conductors conductors COP
in the the soil soil and and without without protection protection against against The minimum minimum size size of of earthing earthing conductors conductors buried buried in The 2 2 be 25 25 mm mm2 bare bare copper. copper. This This value value can can be be reduced reduced to to 16 16 mm mm2 copper copper corrosion shall shall be corrosion it is protected against corrosion. conductor if conductor if it is protected against corrosion.
4.11.6 4.11.6
COP 74, 74, Methods of connecting earthing earthing conductors conductors
For connections connections of of earth earth conductors conductors that that are are buried buried in in the the ground, ground, connections connections made made using using For electrodes that that require require periodic periodic exothermic welding is recommended. Connections to earth electrodes be used. used. inspection at at earth earth electrode electrode inspection inspection chambers, chambers, connections connections using using clamps clamps may may be inspection 4.11.7 4.11.7
COP 75, Selection of protective conductors
to withstand withstand the the prospective prospective fault fault current current and and Every protective protective conductor conductor must must be be selected selected to Every ensure automatic disconnection of supply. ensure automatic disconnection of supply.
4.11.8
COP 76, 76, Size Size of of protective protective conductors conductors cop
In final sub-circuits, the protective conductor shall have In connections connections between switchboards, switchboards, calculations: protective conductors of the following sizes may be used without calculations: a) Same Same size size as as the the line line conductor conductor ifif the the cross cross sectional sectional area area of of the the line line conductor conductor is is a) 2 less then 16 mm2 •. 2
2 of the line conductor is more than 16 16 mm 22 but but less less b) 16 mm if the cross sectional area of 2 than or equal to 35 mm 2••
sectional area area of the line line conductor conductor exceeds exceeds c) Half the line conductor if the cross sectional 2 35 mm 2 ,, the same size as the phase conductors. 4.12 4.12
4.12.1
Protective bonding conductor
COP 77, Size of protective bonding conductors
the main earthing The cross sectional area for protective bonding conductor connected to the 2 for aluminium. aluminium. terminal shall not be less than 6 mm 2 for copper or 16 mm22 for
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© STANDARDS MALAYSIA MALAYSIA 2007 2007 - All rights rights reserved reserved @STANDARDS
MS 1979:2007
4.13 4.13.1 supply
Change-over switch of a standby generating set COP 78, Prevention of parallel operation of standby system with the public
When the generating set in the installation is used as a standby system to the public supply system, means of isolation to prevent parallel operations shall be taken.
4.13.2
COP 79, Separate neutral for the standby system
When operating on the standby supply, the neutral of the supply shall be changed.
4.13.3
COP 80, Overcurrent protection for essential services
be If a standby generating set supplies essential services fire fighting pumpsets, it shall not be device is provided, provided with overcurrent protective devices. If an overcurrent protective device it shall be connected to provide an alarm only.
4.14 4.14.1
installations Initial verification of Installations
COP 81, Initial inspection of installation
to being being Every installation shall be inspected during erection or upon completion prior to energised.
4.14.2
installations COP 82, Supervision of work on LV single phase Installations
LV installations receiving single phase supply shall be carried out under the immediate supervision of a Wireman with Single Phase Restriction or a wireman with Three Phase Restriction and upon completion, the Wireman shall certify a Supervision and Completion Certificate known as Form G. This a requirement under the Electricity Regulations 1994.
4.14.3
COP 83, Supervision of work on LV three phase installations
LV installations receiving three phase supply shall be carried out under the immediate supervision of a Wireman with Three Phase Restriction and upon completion, the Wireman G. This This is is aa shall certify a Supervision and Completion Certificate known known as Form G. requirement under the Electricity Regulations 1994.
4.14.4
COP 84, Testing of work on LV single phase installations
be Upon completion of wiring or rewiring or extension of a single phase LV installation, it shall be tested by a Wireman with Single Phase Restriction or a wireman with Three Phase Restriction Restriction Test Certificate Certificate for for the the authorised to test any installation. The Wireman shall then certify a Test under the Electricity Regulations 1994. 1994. installation known as Form H. This is a requirement under
4.14.5
COP 85, Testing of work on LV three phase installations cop
Upon completion of wiring or rewiring or extension of a three phase LV installation, it shall shall be be tested by a Wireman with Three Phase Restriction authorised to test any installation. The Wireman shall then certify a Test Certificate for the installation known as Form H.
© STANDARDS MALAYSIA 2007 - All rights reserved
13
MS 1979:2007 1979:2007 MS
4.14.6 4.14.6
COP 86, 86, Testing Testing by by Electrical Electrical Services Services Engineer Engineer COP
Upon completion completion of of an an installation installation or or extension extension to to an an existing existing installation installation operating operating at at higher higher Upon than low low voltage, voltage, the the installation installation shall shall be be tested tested by by an an Electrical Electrical Services Services Engineer Engineer and and who who than as Form Form H. H. shall certify certify a a Test Test Certificate Certificate for for the the installation installation known known as shall 4.14.7 4.14.7
COP 87, 87, Condition Condition precedent precedent for for receipt receipt of of electricity electricity COP
The installation installation shall shall not not receive receive electricity electricity from from the the electricity electricity supply supply body body until until the the The and Test Certificate has been submitted by the owner Supervision and Completion Certificate Supervision and Completion Certificate and Test Certificate has been submitted by the owner or management management of of the the installation installation to to the the licensee licensee or or supply supply authority. authority. or 4.14.8 4.14.8
COP 88, 88, Insulation Insulation tests tests on on LV LV installations installations COP
Insulation measurements measurements shall shall be be carried carried out out on on completed completed LV LV installations installations using using d.c. d.c, Insulation voltages. When When 500 500 V V d.c. d.c, is is applied applied to to each each circuit, circuit, the the insulation insulation resistance resistance shall shall be be more more voltages. than 11 MO. MO. than 4.14.9 4.14.9
COP 89, 89, Circuit Circuit checks checks COP
Circuits shall shall be be checked checked and and the the circuit circuit interruption/isolation interruption/isolation devices devices verified verified against against the the Circuits electrical diagrams. electrical diagrams. 4.14.10
COP 90, Requirement for labelling
All circuits circuits and and circuit circuit components components shall shall be be clearly clearly labelled labelled using using Bahasa Bahasa Malaysia Malaysia or or English. English, All 4.14.11
COP 91, As-built diagrams
Every completed installation shall have the as-built electrical diagrams diagrams of of the installation installation The diagrams diagrams shall be be prominently displayed for safety in operation and maintenance. The endorsed by by the the professional professional design design electrical electrical engineer. engineer. endorsed
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© STANDARDS MALAYSIA 2007 2007 -- All All rights reserved reserved
Acknowledgements Ir Rocky Wong Han Hon Thang (Chairman) Ms Khong Choy Tai (Secretary) Ir Goon Kid Seng Ir Looi Hip Peu Engr Fu Wing Hoong Ir Chew Shee Fuee Mr Radzuan Mohd Nor Kuen Ir Chuang Chu KUen Mr Ramli Baba Mr Tan Ah Hock Mr Mohd Ismail Ir Fairus Abd Manaf Talib Ir Faridon TaUb FatU Mr Richard Lew Min FaW Mr Khoo Lin Siang Ir Halim Osman Dr Hew Wooi Ping Prof Dr Hussein Ahmad
The Electrical and Electronics Electronics Association Association of of Malaysia Malaysia The Electrical and and Electronics Electronics Association Association of of Malaysia Malaysia The Association of of Malaysia Malaysia The Electrical and Electronics Association Malaysia Association of Consulting Engineers Malaysia EITA Holdings Sdn Sdn Bhd Bhd EIT A Holdings Engineering (1990) (1990) Sdn Sdn Bhd Bhd G. H. Liew Engineering Bomba dan dan Penyelamat Penyelamat Malaysia Malaysia Jabatan Bomba Jabatan Kerja Raya Sabah Electricity Sdn Sdn Bhd Bhd Electricity Supply Corporation Sarawak Electricity QAS International Sdn Sdn Bhd Bhd SIRIM QAS Testing Section) Section) (Electrotechnical Testing Suruhanjaya Tenaga Tenaga The Institution of Engineers, Malaysia Time Era Sdn Bhd Division TNB Distribution Division Malaya Universiti Malaya Teknologi Malaysia Malaysia Universiti Teknologi
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