Regulation & Supervision Bureau Water and Electricity Sector Emirate of Abu Dhabi
The Electricity Wiring Regulations (2007) - Amendment No.1 Consultation
10/08/2008
CD/R01/018
Version 1
Document
Approved by
Recipients of controlled copies
CD/R01/018
NC
AADC, ADDC, Bureau website
The Electricity Wiring Regulations (2007) - Amendment No. 1 Consultation
CD/R01/018
10 August 2008
Title: The Electricity Wiring Regulations (2007) - Amendment No. 1 Consultation Author TK
Document CD/R01/018
Version 1.0 Page 1 of 3
Publication date 10 August 2008
Approved by NC
Contents
Foreword ..................................................................................................................... 3
Attachment: The Electricity Wiring Regulations (2007) - Amendment No. 1 Consultation, August 2008
Title: The Electricity Wiring Regulations (2007) - Amendment No. 1 Consultation Author TK
Document CD/R01/018
Version 1.0 Page 2 of 3
Publication date 10 August 2008
Approved by NC
Foreword The Regulation and Supervision Bureau for the water, wastewater and electricity sector in the Emirate of Abu Dhabi (the Bureau) issued new Wiring Regulations in December 2007, covering the design, installation and maintenance of electrical installations in premises. Following implementation of these Regulation during 2008 the Bureau now proposes to issue an amendment to the Regulations, as a result feedback from interested parties. This amendment contains a number of clarifications and additional guidance. Two items of particular note concern the arrangements for RCD protection in Final Distribution Boards (clause 7.8.6) and the method for calculating Diversified Load (clause 3.2.5). The Bureau wishes to consult all interested parties on the proposed amendment, following which a revision of the Electricity Wiring Regulations will be issued. Responses should be provided by post or email by 10 September 2008, addressed to: Nick Carter Director General Regulation and Supervision Bureau PO Box 32800 Abu Dhabi Email:
[email protected]
Title: The Electricity Wiring Regulations (2007) - Amendment No. 1 Consultation Author TK
Document CD/R01/018
Version 1.0 Page 3 of 3
Publication date 10 August 2008
Approved by NC
Amendment No.1 [Note: new or replaced text is shown in blue. Deleted text is shown as strikethrough. The reason for the change is given in brief in the right margin]
1.2.2
Notes which are included below clauses, in italic text, are not mandatory and are for guidance, clarification or provide supporting technical information.
1.2.3
The second part of this document consists of Appendices, which contain mandatory information, and Guidance Notes which are not mandatory except where referenced in the Regulations.
2.1.26 Diversified Load: the load at a Distribution Board, at the Supply Intake or at any other point in an Installation, calculated using diversity factors as illustrated in Appendix A20(f) and Guidance Note G2. 3.2.5
The Customer must provide an estimate of the Connected Load at the Premises, including at each Distribution Board. In addition, the Diversified Load for the whole Premises and at each Distribution Board, must be calculated by the Customer’s appointed Licensed Contractor, design engineer or other qualified person and submitted in the format given in Appendix A20(e), see Guidance Note G2.
amended to include requirements of Notes
amended to include requirements of Guidance Notes
new definition of 'Diversified Load'
addition of term 'Diversified Load'
4.1.10 The maximum three-phase Prospective Fault Current (fault level) for LV supplies shall be 46 kA (1 second) at the LV busbar of the Distribution Company's HV/LV substation … 5.3.2
Residual Current Devices with a residual current rating of 30 mA and complying with BS EN 61008 and BS 4293 may be used as a means of supplementary protection against Direct Contact. …
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correction
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5.4.3
5.4.5
RCD devices for Final Circuits must have a time-current performance characteristic complying with BS EN 61008 and BS 4293. … Earth Leakage Protection provided at the Supply Intake must be set to discriminate with ELP devices at Final Circuits (i.e. earth faults on Final Circuits must be automatically disconnected by the closest ELP device, except in the case of back-up operation of devices at the Supply Intake). See Appendix A5(m) and Guidance Note G4(e).
correction
additional cross-reference
[Note: such discrimination may be provided by time-delayed RCD's at the Supply Intake, earth fault relays or other suitable devices. ELP is not required at Sub Distribution Boards but, if provided, must discriminate with ELP devices on upstream and downstream Circuits]. 5.4.6
clarification
The operating current setting for ELP devices at the Supply Intake must take into account the nature of the Installation (e.g. commercial, industrial etc), the likelihood and magnitude of earth fault currents, and the requirement for protection against Indirect Contact, see Appendix A5(m) and Guidance Note G4(f).
[Note: where the Supply Intake consists of a multi-panel LV switchboard, each panel or circuit breaker should be fitted with ELP devices in order to limit the extent of power interruptions.]
clarification note
5.6.8
Water heaters, air conditioning units, motors and other similar items must be provided with double pole isolation (or 4 pole isolation for 3phase items) to ensure safe access for the purpose of maintenance and repair.
new clause
6.2.1
(b) … The Distribution Company system is earthed at the distribution transformer (11kV/400V) and separate earth and neutral conductors are used …
6.6.1
correction
All Exposed-Metallic-Parts of an Installation,
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correction
including Appliances, must be connected to Earth via Earth Conductors which in accordance with the requirements of Regulation 6.5. 6.8.4
The use of structural steel in place of, or in connection with, lightning down conductors is not permitted unless approved by the Distribution Company. Structural foundations or piles may be used as lightning earth electrodes if sufficiently separated from the Main Earth Electrodes.
7.1.3
The use of 'Shuko' CEE7/7 2-pin type plugs is strictly prohibited. The use of 'Euro' CEE7/16 plugs is permitted only where used with an approved adaptor converting such plugs for use on BS 1363 type socket-outlets, see Appendix A17(a).
7.1.4
An allowable exception to clause 7.1.1 is the use of shaver supply units in bathrooms, complying with BS 3535. For these types of socket-outlet, which are supplied by a SELV safety isolating transformer, 2-pin unearthed type plugs may be used but which must also comply with BS 3535. See Appendix A17(c).
7.1.7
7.1.9
Socket-outlets for normal use must be positioned at a standard height of 300 mm or 450 mm above floor level or 100 mm above work surfaces, see Appendix A16. Socket-outlets in kitchens or other areas where water is used must be positioned at least 1.0 m away from sources of water (e.g. sinks, basins, filter units, supply taps). Consideration must be given to the use of splash proof socket-outlets (IP 54).
new clause
amended to clarify prohibitions
amended to allow the use of CEE7/16 'Euro' plugs in shaver supply units
amended to allow alternative mounting height of socket-outlets
relaxation of requirement (was IP56)
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7.1.14 Outdoor socket-outlets must be of the weather protected type (IP55) and incorporate a 30 mA RCD, see Guidance Note G7(c).
[Note: where a number of socket outlets are installed in close proximity, the above requirement may be met by one RCD device serving the group of outlets, provided that the RCD device is readily accessible and visible to persons using the socket-outlets and is clearly labelled.] 7.3.2
7.4.6
The rating of lighting Circuits shall be selected in accordance with the number of connection points to be supplied, the type and rating of luminaires to be used, and the Connected Load for the Circuit. A standard method of calculating Connected Load is given in Guidance Note G2 and illustrated in Appendix A20(f). Where conduit is buried installed within a wall, floor or ceiling it must be installed at a minimum depth of 50 mm from the surface. If it is installed at a shallower depth then metal conduit must be used. See Guidance Note G7(e).
[Note: for solid walls, the above required depth may be reduced to 25 mm for horizontal and vertical lengths of conduit which are within 4 m of a visible Accessory or connection point.]
note added for groups of outdoor socket outlets protected by one RCD
amended to meet sizing according to Connected Load
note added to relax depth requirement for buried conduits near Accessories
7.5.10 … The maximum voltage drop from the Customer Connection Point to the remote end of any Final Circuit must not exceed 4% …
[Note: for cases where the Distribution Company's HV/LV transformer is sited within the Premises the maximum voltage drop shall be 6% from the LV connection of the transformer to the remote end of any Final Circuit.]
noted added to relax requirement of voltage drop limits for on-site substations
7.5.12 Other than as allowed under clause 7.5.15, all cables that are not armoured, or that do not have a metallic sheath or screen, must be
amended to allow the use of metallic sheathed or screened
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installed in plastic or metal conduit or trunking throughout their entire length. 7.6.1
7.7.6
The sizing of Final Circuits must be in accordance with the Connected Load on each Circuit (see Guidance Note G2), whilst taking account of ambient temperature, grouping factors and power factor, see Appendix A7(a) A7(h). Busways, bus ducts and busbar risers shall have neutral conductors of equal size to the phase conductors and shall have a dedicated Earth Conductor. The use of the metal casing as an Earth Conductor shall not be is permitted only for Earth Leakage Protected Installations, and with the prior approval of the Distribution Company.
cable outside conduit
amended to meet sizing according to Connected Load
amended to allow the use of Busways where the metal casing is used as an Earth Conductor
[Note: Aluminium metal casings should be used in preference to steel due to the risk of corrosion and high resistance joints. In either case the sizing of such conductors must meet the values equivalent to copper conductors given in Appendix A5(j).] 7.7.7
7.8.2
The current rating of busways, bus ducts and busbar risers shall be based on the Connected Load Diversified Load of the relevant part of the Installation being supplied. However, additional diversity factors may be applied for high-rise buildings or other large installations rather than taking the sum of Connected Loads. Diversity factors must be justified and submitted with the design for approval by the Distribution Company, see Regulation 3.2 and Guidance Note G2. Distribution Boards must be of robust construction, capable of withstanding expected electrical, thermal, and environmental stresses in normal service and during faults.
[Note: Distribution Boards will normally be rated for the Diversified Load of the Circuits supplied,
amended based on new definition of Diversified Load
note added to clarify sizing according to Diversified Load
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see Guidance Note G2.] 7.8.6
All Final Distribution Boards must have at least two busbar sections, be arranged so as to provide for at least two zones of Earth Leakage Protection (e.g. 100mA and 30mA) and to avoid complete disconnection of power to the area being served, in the event of an earth fault. This may be achieved by either of the following methods:
clarification and note to explain the requirement for two busbar section DBs and alternative arrangements
(a) two or more busbar sections, each protected by an RCD; (b) one busbar section, with individual RCBOs fitted on all Final Circuits; (c) two or more FDBs installed together to serve an area, each having one busbar section protected by an RCD of appropriate rating (e.g. one DB with an incomer 100mA RCD for lighting and another DB with incomer 30mA RCD for power circuits)
[Note: solid busbar or removable ('comb') busbar DB's are acceptable (horizontal or vertical type) where the manufacturer's type tests are provided. As an exception, small DBs serving a limited area (up to 9 ways single phase or 3 ways 3-phase) may be provided with one busbar section, and one incomer RCD, e.g. hotel rooms, pump room, central a/c room, etc.] clarification
7.8.13 All outgoing circuits of Distribution Boards must be provided with only circuit-breakers (such as CBs, MCBs, MCCBs, RCDs, RCBOs, etc) and shall not contain fuses of any kind, except for capacitor banks. See Regulation 10.2.
[Note: the incoming device of a DB may be an isolator switch, where adequate fault protection is provided by an upstream Protective Device.] 7.8.8
clarification note
The number of Final Distribution Boards and Sub Distribution Boards provided in a Premises shall take into account the future accessibility, maintainability and safety of the
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system, whilst limiting the extent of possible power outages to serviced areas.
[Note: to meet the above requirement Final Distribution Boards should be limited to a maximum capacity of 14 ways 3-phase i.e. 42 Circuit positions] 7.8.15 Distribution Boards of rating 200 A and above shall be installed in a dedicated room, cupboard, or other enclosure complying with clause 7.8.14 and clause 3.5.9.
clarification to include Sub Distribution Boards
amended to allow use of enclosures
[Note: Main Distribution Boards of rating 200 A and above must be located in a Supply Intake room, see Appendix A12(b).] 9.3.2
9.3.2
9.4.1
9.5.1
9.5.1
(a) all Final Circuits must be protected by an RCD of residual current rating 30 mA and complying with BS EN 61008 and BS 4293. … (e) Appliances, Luminares or Accessories which are within Arm's Reach from a bath, shower or similar facility must be supplied by SELV or PELV and have a minimum level of ingress protection of IPX4. Underwater lighting must be supplied by SELV at a maximum voltage of 12 V a.c. or 30 V d.c.
correction
relaxation of requirement (was IPX7)
(a) all Final Circuits must be protected by an RCD of residual current rating 30 mA and complying with BS EN 61008 and BS 4293. …
correction
(a) all Final Circuits must be protected by an RCD of residual current rating 30 mA and complying with BS EN 61008 and BS 4293. …
correction
(e) Appliances, Luminaires or Accessories which are within Arm's Reach from a water fountain must be supplied by SELV or PELV and have a minimum level of ingress protection of IPX4. Underwater lighting must be supplied by SELV at a maximum voltage of 12 V a.c. or 30 V d.c
relaxation of requirement (was IPX7)
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APPENDICES A3
Reference standards … continued (p112)
- add row as follows: RCD socket outlets
A5(j)
added reference standard for RCD socket-outlets
BS EN 7288
Sizing of earth conductors Note 2: Earth Conductors must always be insulated and a cross-sectional area of less than 2 1.5 mm must not be used unless they are an integral part of a sheathed cable (e.g. an Appliance flexible cord).
changed from 2.5mm 2
A5(k) Minimum number of earth electrodes note added
Note 2: Structural foundations of large buildings may be used as Earth Electrodes, see clause 6.4.3.
A5(m) Residual operating current settings for RCDs and ELP devices
last row of table: LV main circuit breakers or switchboards
300 - 500 (time-delayed)
Note 2: all Final Circuits in a bathroom (including lighting) must be provided with 30 mA RCD protection. See clause 9.3.2(a).
clarification for discrimination of protection
additional notes added
Note 3: where a circuit supplies more than one type of equipment the lower value must be used for RCD protection (e.g. a circuit supplying bedroom lighting and bathroom lighting must be protected by a 30 mA RCD).
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A6(f)
MCBs selection criteria
amend row 4 and 5 as follows: MCB rating
20
Cable size 2 mm 4.0
Cable rating at o 30 C 32 (6.3)
Cable rating at o 40 C
27.8 (5.4)
Typical applications Radial Circuit to fixed appliance (e.g. a/c unit)
amended to allow 2
32
2 x 4.0
48 (9.3)
41.7 (8.1)
Ring Circuit to socketoutlets
Note 1: cable ratings are taken from Appendix A7(a), assuming one circuit in conduit, with temperature correction factors applied from Appendix A7(g). Power factor of 0.85 is assumed to calculate kW ratings at 230V.
2 x 4mm conductors 2
instead of 6mm
clarification notes added
Note 2: selection of MCBs for overload protection of cables must take account of the device characteristics given in Appendix A6(b) to A6(d). These are based on minimum MCB operating currents of 1.45 times the MCB nominal rating (In) and a maximum 'non-tripping' current of 1.15 times In. Hence, cables must be selected with ratings at least 1.15 times the MCB nominal rating (see IEE Guidance Note 6 - section 2).
A12(b) Diagram: Typical layout of supply intake room
- amend table as follows: Main circuit breaker rating (A)
Intake room dimensions (m)
>600 - 1000
2.5 x 2.5
>300 - 600
2.5 x 2.0
200 - 300
2.0 x 2.0
amended to specify minimum size of supply intake rooms
A12(c) Typical layout of final distribution board
Amend drawing to show 2-section busbar
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A12(d) Typical layout of LV switchroom
Amend drawing (outgoing circuits should be above panels 2 and 3) A14
correction
Diagram: Typical layout for ring circuit and radial circuits
- amend to show 2 or more 15A socket-outlets - remove joint on spur socket-outlet
A15
Minimum number connection points Room
of
socket-outlets
and
Minimum number of outlets for domestic premises
Kitchen: 13A socket-outlets
every 2 m of worktop, plus as required for free standing Appliances (e.g. fridge)
20A spur connection points for washing machine, dryer, etc
as required for number of items installed (flex outlet or socket-outlets)
45A cooker control unit
1
Bedrooms
3
Lounge or dining
4
Hall or corridor
1
Bathrooms
correction
amended to cater for various sizes of kitchens
only BS 3535 shaver socket
Note 1: in all of the above cases double socket-outlets should be used in preference to single socketoutlets wherever possible
notes added for clarification
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Note 2: socket-outlets should be conveniently located to avoid the need for extension cables and adapters (which introduce risk of overheating and fire) Note 3: 15A BS 546 socket-outlets are not permitted in domestic premises (see clause 7.1.1) Note 4: the maximum number of socket-outlets on a Circuit is not limited and is dependent on the load supplied (see Guidance Note G2)
A19(g) Sequence of testing for new installations Note 2: testing of RCDs must include measurement of the operating time (ms) at In and at 5 x In, as well as check of non-operation at 50% x In.
new note added
A20(a) Electrical installation certificate addition
add "Total Diversified Load", in row 3 A20(b) Inspection report addition
add "Total Diversified Load", in row 3 G1
Guidance note on supply voltage change … the UK has adopted a supply voltage of 230 / 400 V
G5(a)
RCD operating characteristics and electric shock … This is normally achieved with RCD devices complying with BS EN 61008 and BS 4293. …
G7(c)
correction
correction
Weather protected outdoor socket-outlets diagram note: delete IP66, insert IP55
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G2
Estimation of connected load and Diversified Load (see amended table over leaf)
Note 1: the Connected Load values above are based on typical Appliances and connection points. Diversity factors should be applied to calculated the Diversified Load, see Appendix A20(f). Note 2: the Connected Load (and cable rating) for Circuits supplying socket-outlets should be based on 3,000 W for the first socket-outlet, plus 200 W for the remainder, where a double socket outlet is counted as 2 (e.g. circuit rating for 5 x double socket-outlets = 3kW + 9 x 0.2kW = 4.8kW). A diversity factor of between 30% - 60% should be applied to this value to derive the Diversified Load. Note 3: where more than one diversity factor is shown above the designer should select a value representing the intensity of usage (e.g. higher value for high usage Circuits, such as kitchens, and lower value for bedrooms etc). Note 4: additional diversity factors should be applied at Sub Distribution Boards and Main Distribution Boards, typically 0.9. Hence, the expected demand at the Supply Intake may be 0.81 times the sum of the FDB Diversified Load values.
revised values of Connected Load
revised calculation of Connected Load for socket-outlet Circuits
selection of appropriate diversity factors
diversity factors for Main and Sub Distribution Boards
Note 5: a 90% diversity factor may be applied for split or window type air conditioning units; diversity factors for central a/c units should be based on manufacturers data or load readings taken from other similar installations (during summer temperature conditions) Note 6: for domestic Premises the total Diversified Load would normally be expected to be in the range of 40% - 60% of the total Connected Load. These values may be checked against the expected electricity usage for similar domestic Premises (typically 30 - 80 W / sq m Diversified Load, including air conditioning) Note 7: for non-domestic Premises an assessment of diversity factors must be made by a qualified designer or engineer with knowledge of the
check of diversified load vs. floor area for domestic Premises
assessment of diversified load for non-domestic Premises
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proposed usage of the Installation. For example, machinery operating in short duration cycles (a few minutes) may have a diversity factor of 20%, whilst continuously operating plant would have a diversity factor of 100%. For commercial offices, calculations of Diversified Load may be compared against other similar Premises, based on the floor area (e.g. 80 - 120 W / sq m for high density offices).
- amended to reflect realistic Circuit ratings (Connected Load) and typical Diversity Factors
Table G2
Estimation of Connected Load and Diversified Load for domestic premises Type of load
Lighting
Connected load
•
• •
Applied diversity factor
sum of wattage of all luminaries or assume 100W for each lighting point (except chandelier points) chandelier lighting points – 500W 1.8 x lamp wattage for fluorescent lighting
75%
13A socketoutlets
•
3,000 W for first socket-outlet plus 200 W for remainder socket-outlets (including kitchen ring circuits)
30% - 60%
Kitchen power points
•
30% - 60%
•
kitchen appliance connection points (flex outlet) assume 2,000 W each or actual rating of appliance (e.g. washing machine, dryer, dish washer etc) cooker – assume 6,000 W or actual rating of oven plus the largest ring fridge – assume 300 W or actual rating
Other power points
• •
water heater – 1,500 W or actual rating motors (e.g. lifts) – actual rating
30% – 60%
Air conditioning
• •
split air conditioning units – full rating window air conditioning units – full rating central a/c units (see note 5)
90%
•
•
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Appendix A20(f) Sample Load Distribution Schedule Mr Mubarak Al Hosni Villas Sector ME-10 Plot C-96, Abu Dhabi FDB-2 second floor apartment......... MDB-1 (intake room).......................
Project / Building Name: Address / Location: Distribution Board No. / Ref.
Busbar section / RCD
Section 2 30mA RCD 40A 3ph
63A isolator 3ph
Section 1 100mA RCD 40A 3ph
Incomer
Fed from:
Sedmand Construction LLC......... Al Ramal EC ................................. Incoming Cable size / type: 4C x 25mm XLPE with SWA earth…....................... Main breaker type & rating: 63A isolator + 2 RCD (see below)…......................
Main Contractor:
Electrical Contractor:
Date: Document No.
CCT ref. No.
MCB rating (A)
Phase & Neutral Size mm2
Earth size mm2
Cable rating A (kW) [see notes]
Circuit name / Point reference
No. of points (double / single)
Connected Load per point (kW)
R
R1
6
1.5
1.5
17.5 (3.4)
Lighting, bedrooms 1, 2, 3
10
0.1
1.0
Y1
6
1.5
1.5
17.5 (3.4)
Lighting (fluorescent) - kitchen
10
0.05
B1
6
1.5
1.5
17.5 (3.4)
Lighting - lounge (inc. chandelier 500W)
11
0.1/0.5
Circuit Load (kW)
6
1.5
1.5
17.5 (3.4)
Smoke detectors
3
0.02
10
2.5
1.5
24.0 (4.7)
FCU-1, FCU-2, FCU-3 (bedrooms)
3
0.6
B2
10
2.5
1.5
24.0 (4.7)
FCU-4, FCU-5 (lounge, kitchen)
2
0.8
R3
32
6.0
2.5
41.0 (8.0)
Cooker (rating = oven + 1 ring)
1
5.5
5.5
1.5
B3
spare
R4
16
2.5
1.5
24.0 (4.7)
Water heater: kitchen (flex outlet)
1
1.5
Y4
16
2.5
1.5
24.0 (4.7)
Water heater: bathrooms 1 and 2
2
1.2
B4
6
1.5
1.5
17.5 (3.4)
Lighting (fl) + shaver socket - bathrooms 1, 2
6
0.05
R5
32
2 x 4.0
2 x 2.5
48.0 (9.3)
Socket-outlets - kitchen ring (inc. fridge)
3d + 1s
3.0 / 0.2
Y5
16
2.5
1.5
24.0 (4.7)
Socket-outlets: maid's room + corridor
1d + 1s
3.0 / 0.2
B5
20
4.0
2.5
32.0 (6.3)
Flex-outlets - dishwasher, dryer, w/machine
3
2.0
R6
32
2 x 2.5
2 x 1.5
36.0 (7.0)
Socket-outlets (ring) - lounge
4d + 3s
3.0 / 0.2
R7
32
2 x 4.0
2 x 2.5
48.0 (9.3)
Socket-outlets (ring) - bedrooms 1, 2, 3
8d + 3s
3.0 / 0.2
R8
B
1.5
Y2
spare
Y
0.54
R2
Y3
4-7-08 ARE-34-8.
0.06 1.8 1.6
2.4 0.4 4.2 3.4 6.0 5.0 8.6
Diversity factors
Circuit load after diversity (kW)
0.75
0.75
0.75
0.40
0.75
1.13
1.0
0.06
0.9
1.62
0.9
1.44
0.3
1.65
0.3
0.45
0.3
0.72
0.75
0.30
0.5
2.10
0.3
1.02
0.3
1.80
0.3
1.50
0.3
2.58
spare TOTAL CONNECTED LOAD = 43.5
17.3
TOTAL DIVERSIFIED LOAD = 17.5 (40%) Notes:
9.5 17.5 kW
1. Cable ratings taken at 30oC and 0.85 power factor, installed as single circuits in conduit 2. Cable rating must be above circuit Connected Load and at least 1.15 times MCB nominal rating
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