IEE Wiring Regulations

July 27, 2017 | Author: haiob | Category: Electrical Wiring, Cable, Power Engineering, Force, Power (Physics)
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Dr Hani Obeid

a   Dr Hani Obeid received his MSc and PhD in power systems & networks fro Leningrad Polytechnic Institute (now St. Petersburg State Technical University) in 1974 and 1980 Respectively. From 1980 to 1983 worked in Jordan Electricity Authority. He started research in pollution of HV transmission line for the first time in Jordan. He designed the first 400 KV line in Jordan. From 1983- till now he is working as consultant and designer in electrical installations and architectural acoustics. Dr Hani Obeid


from 2000 till now he is an Assoc. Prof. EE/ Applied Sciences University. He is a senior member in IEEE. He is the author of the following books: .ΔϴϋΎϨτλϻ΍ ΓέΎϧϹ΍ Ϣψϧ .(ϥ΍έΪΑ Ϣϴϫ΍ήΑ· .Ω ϊϣ ϙ΍ήΘηϻΎΑ) ϞΑϮϧήθΗ ΔΛΩΎΣϭ ΔϳϭϮϨϟ΍ ΔϗΎτϟ΍ .(ϪϴϟΎϋ ΪϤΤϣ .Ω ϊϣ ϙ΍ήΘηϻΎΑ) ΎϬΘϳΎϤΣϭ Δϴ΋ΎΑήϬϜϟ΍ Ε΍ΪϳΪϤΘϟ΍ .(ϥΎδϧϹ΍ϭ ΔϗΎτϟ΍ϭ ΔΌϴΒϟ΍ ΕΎϣϮψϨϣ-ΔΌϴΒϟ΍ϭ ϥΎδϧϹ΍ .Γέ΍Ϊϟ΍ ήμϗ ΕΎΑΎδΣ .ϯήΒϜϟ΍ ϊϳέΎθϤϟ΍ ϲϓ Δϴ΋ΎΑήϬϜϟ΍ Ε΍ΪϳΪϤΘϟ΍ ϢϴϤμΗϭ ςϴτΨΗ .(ϲϧΎΒϤϟ΍ϭ ΕΎϋΎϘϠϟ ϲΗϮμϟ΍ ϢϴϤμΘϟ΍) ϦϴϳέΎϤόϤϟ΍ ϦϴγΪϨϬϤϠϟ ΕΎϴΗϮμϟ΍ .(ΔϋΎΒτϟ΍ ΖΤΗ) ϲϧΎΒϤϟ΍ ΕΎϴΗϮλ Dr Hani Obeid

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The Wiring Regulations BS7671: currently 17th edition The BS7671 Wiring Regulations is a non-statutory document, Which plays a key role in the electrical industry in terms of Standards and safety of electrical installation in buildings. The regulations provide guidance of the standards and the Latest 17th edition is effective from 1st of July 2008 and currently in implementation instead of the 16th edition.

2 Dr Hani Obeid

      !!"1st edition of the ³Wiring Rules´ issued. Entitled ³Rules & Regulations for the prevention of the fire Risks arising from electric lighting´. !!!2nd edition. !#$3d edition entitled ³General Rules recommended for Wiring for the supply of Electrical Energy´. Dr Hani Obeid


#%&4th Edition of the IEE Wiring Regulations, called ³Wiring Rules´. #%$5th Edition of the IEE Wiring Regulations. # 6th Edition of the IEE Wiring Regulations. # '7th Edition of the IEE Wiring Regulations. #"(8th Edition of the IEE Wiring Regulations ³Regulations for the Electrical Equipment of Buildings´. #"$9th Edition of the IEE Wiring Regulations.

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#&(10th Edition of the IEE Wiring Regulations. #&#11th Edition of the IEE Wiring Regulations, Revised issue (1943), reprinted with minor Amendments (1945), supplement issued (1946), Revised Section (1948). #)%12th Edition of the IEE Wiring Regulations Launched, Supplement issued (1954). #))13th Edition of the IEE Wiring Regulations Launched, reprinted, 1958, 1961, 1962 and 1964.

Dr Hani Obeid


#''14th Edition of the IEE Wiring Regulations published. Reprinted, 1968, 1969, 1970 (in Metric units), 1972, 1973, And 1976. #! the 15th Edition of the Wiring Regulations launched. ## 16th Edition of the IEE Wiring Regulations published (adopted as the BS in 1992). Electricity at work regs. (Northern Ireland) come fully into being. "%%(Part P of the Building Regulations becomes law. BS 7671:2001 Requirements for the Electrical Installations (incorporating Amendments No.1:2002 and No.2:2004. The IEE Wiring Regulations 16th Edition. Dr Hani Obeid


"%%$17th Edition of the IEE Wiring Regulations is Scheduled to be issued on January 1st 2008 and comes into effect 6 months later. It was actually available around 21st of January 2008. After July 1st 2008, designs must comply with the New 17th BS7671 wiring regulations.

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The 17th Edition is the result of a complete review of the 16th Edition and aims to standardize the UK standards With the Harmonized Documents (HD¶s) produced By the European Committee for Electro technical Standardization (CENELEC).

Dr Hani Obeid


    $    Requirements for Electrical Installations IEE Wiring regulations BS7671: 2008 consists of 7 parts and 15 appendices.

Dr Hani Obeid



 * Scope, Object and Fundamental Principles. "*Definitions. &*Assessment of General Characteristics. (*Protection of Safety. )*Selection and Erection of Equipment. '*Inspection and Testing. $*Special Installations or Locations.

Dr Hani Obeid


   1. British Standards to which reference is made in the regulations. 2. Statutory regulations and associated memoranda. 3. Time/current characteristics of over-current protective devices and rcds. 4. Current-carrying capacity and voltage drop for cables and flexible cords. 5. Classification of external influence. 6. Model forms for certification and reporting. Dr Hani Obeid


7. Harmonized cable core colors. 8. Current-carrying capacity and voltage drop for bus bar trunking and power track systems. 9. Definitions-multiple source, d.c and other systems. 10. Protection of conductors in parallel against over current. 11. Effect of harmonic currents on balanced threephase systems.

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12. Voltage drop in consumer¶s installations. 13. Methods for measuring the insulation resistance/impedance of floors and walls to earth or to the protective conductor system. 14. Measurement of earth fault loop impedance: consideration of the increase of the resistance of conductors with increase of temperature. 15. Ring and radial final circuit arrangements, regulation 433.1. Dr Hani Obeid


  /    ,    01   +    .  , 2 

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 03 4  A new informative note in the preface Advises that the publication of the 2008 edition of BS7671 does not automatically mean that installations Complying with previous editions are unsafe for continued Use or need to be upgraded.

Dr Hani Obeid


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Dr Hani Obeid


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450m 0 101 Requirements are added for protection for persons and livestock against Injury, and properly against damage by voltage Disturbances and electromagnetic influences.

Dr Hani Obeid


  & 4 ,     & 'adds requirements to protect against Voltage disturbances and implementation measures against electromagnetic influences. In doing so, the design shall take into consideration the anticipated Electromagnetic emissions generated by the installation Or the installed equipment, which shall be suitable For the current-using equipment used with, or connected To, the installation. Dr Hani Obeid


  &" &requires that documentation for The electrical installation, including that required by Chapter 51, Part 6 and Part 7, is provided for Every Electrical installation

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 &) .  This chapter recognizes the need for safety services, as these are frequently regulated by statutory authorities whose requirements have to be observed (e.g. emergency Escape lighting, fire alarm systems, installations for fire Pumps, fire rescue service lifts, smoke and heat Extraction equipment).

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 &'    .  This chapter requires that an assessment be made for Each circuit of any need for continuity of service Considered necessary during the intended life of The installation.

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 ( 1. The chapter has been rewritten. Many regulations Are worded differently but the requirements are not Significantly changed. 2. The terms ³Direct Contact´ and ³Indirect Contact´ Are no longer used. They are replaced with a     and    

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a 0       ,   

is protection against touching live parts 4 510         

is protection against receiving a shock from conductive parts that have been become live due to a breakdown of insulation or damage to equipment.

Dr Hani Obeid


3. Socket outlets rated not exceeding 20 A and intended for General use by ordinary persons must be protected with 30mA RCD. This means that general purpose sockets In domestic and similar properties must have RCD Protection. 4. External sockets not exceeding 32A must also have 30 mA RCD protection.

Dr Hani Obeid


5. Maximum permitted loop impedance - ? Values have been adjusted, based on 230 V Nominal and this has slightly reduced these, For example for 32 A type B mcb the maximum Permitted is 1.44 ohms and was previously 1.5 ohms. Tables 41B1, 41B2, and 41D have been replaced by tables 41.2, 41.3, and 41.4

Dr Hani Obeid


RCDs should have a rated residual operating Current not exceeding 30mA and an operating time not exceeding 40ms at a residual current of five times the rated residual operating current. Chapter 41 includes a new table 41.5, which gives Maximum values of earth fault loop impedance For RCD to BS EN 61008-1 and BS EN 61009-1. This chapter includes the UK reduced low voltage system. Regulation 411.7 recognizes FELV as Measure a protective Dr Hani Obeid


 ("     /      6   -  the protection against thermal effects, includes Requirements in section 422 Precautions where particular risks of fire exist (These requirements Were previously stated in Section 482 of BS 7671:2001.

Dr Hani Obeid


 (&     . 7   this includes those requirements previously given in Section 473 of BS7671:2001. Information on the over current protection of Conductors in parallel is given in Appendix 10.

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 ((     .      This includes a new section 422, covering the Protection of low voltage installations against Temporary over-voltages, due to earth faults in The high voltage system and faults in the low voltage system.

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This new section provides for the safety of the Low voltage system under fault conditions, Including faults in the high voltage system, Loss of the supply neutral in the low voltage System and short circuit between a line conductor And neutral in the low voltage installation.

Dr Hani Obeid


  ((& Section 443 on the protection of over-voltages of atmospheric origin, or due to switching, retains the Existing text from BS 7671. it also adds regulations Enabling designers to use a risk assessment approach When designing installations which may be susceptible To over-voltages of atmospheric origin.

Dr Hani Obeid


 )"          , This now includes bus-bars trunking systems and power track systems. Cables concealed in a wall or partition (at a depth of less than 50 mm) now need to be Protected by a 30 mA RCD, where the installations is Not intended to be under the supervision od a skilled or Instructed person, if the normal methods of protection Cannot be employed.

Dr Hani Obeid


Table 52.2, concerning cables surrounding by thermal insulation, gives slightly reduced de-rating factors, to take account of the availability of material with Improved thermal insulation.

Dr Hani Obeid


 )&        8   Simplification means that requirements previously In chapter 46, section 476 and 537 of BS7671:2001 are now covered in this single chapter. Chapter 53 also includes a new   )&"m.   4      6 4 and a new   )&!on Monitoring Devices.

Dr Hani Obeid


 )(   ,    .    The requirement that a metallic pipe of a water utility Supply shall not be used as an earth electrode is retained in  )(""(which also states that other Metallic water supply pipe-work shall not be used as An earth electrode, unless precautions are taken against Its removal and has been considered for such a use.

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 )(&$has earthing requirements for the installation of equipment with high protective Conductor currents, previously in Section 607 of BS 7671:2001

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 ))  +, This includes new additional requirements in  )) $to ensure the safe connection of low voltage generating sets including small-scale Embedded generators (SSEGs).

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 )'  .  This chapter has been expanded in line with IEC Standardization.

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 $      1   This part includes the following changes: Section 607 in BS 7671:2001 relating to high Protective conductor currents has been incorporated Into  )(

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Section 608 in BS 7671:2001 has been incorporated into   $%!        .9 , 6  , 1    and   $"         .     . 

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  $%" /,,    a  This special location now includes basins of fountains. Zones A, B, and C in BS 7671:2001 are replaced by 0,1, and 2.

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  $%&  ,     Zones A, B, C, and D in BS 7671:2001 are Replaced by zones 1,2,and 3 (with changed Dimensions).

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  $%(       m,   The reduced disconnection times (0.2s) And the 25 V equation no longer appear

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        ,  The reduced disconnection times (0.2s) and the 25V equation no longer appear. Additional requirements applicable to life support systems Are included.

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Section 706 Conducting Locations with Restricted Movement

This was previously Section 606 in BS 7671:2001

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?ecti lectrical I stallati i ara a / a ?i ilar cati s


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This w i clu es the require e ts that each I i i ual s c et- utlet ust be r i e with O er-curre t a R D r tecti .

Dr Ha i Obei


New Sections included in Part 7   $%#*Marines and similar locations.   $ *Exhibitions, show and stands.   $)&*Floor and ceiling heating systems.   $ "*Solar photovoltaic (pv) power Supply systems.   *$ $* Mobile or transportable units.

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  $" *Electrical installations in caravans and motor caravans ± this was previously in section 608 of BS 7671:2001.   $(%*Temporary electrical installations for structures, amusement devices and booths at fairgrounds, amusement parks and circuses.

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 7    For three-phase cables the phase colors are brown, black And grey, instead of red, yellow, and blue, respectively And the neutral color is now blue instead of black. Again the protective color conductor is identified by the Color combination green- and ± yellow. Alternatively all three of the phase conductor cores May be colored brown and marked L1, L2, L3 at the termination Dr Hani Obeid


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