WESTERN POWER DISTRIBUTION

Housing development materials framework appendix to be read in conjunction with:

ENA Engineering Recommendation G81 “Framework for Design and Planning, Materials
Specification and Installation and Record for Greenfield Low Voltage Housing Development
Installations and Associated, New, HV/LV Distribution Substations” – Part 2 Materials
Specification. Version agreed at Ofgem ECSG on 12th October 2004

Unless otherwise stated the document applies across all 4 WPD licence areas.

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 Document Revision & Review Table
Date Comments Author
 Change to approved suppliers of LV
Linkboxes
 Change to Approved suppliers of LV
Sept 2018 Richard Summers
connectors
 Change to Approved supplier of marker tape
/ marker boards
 Removal of 315kVA ground mounted
transformers
April 2015 Andrew Reynolds
 Inclusion of new distribution transformer
suppliers
 Removal of all 4mm and 16mm service
cables
April 2015 Richard Summers
 Additional 3PH LSF service cables now
included
 Change in Approved supplier for LV cables
 Change in Approved supplier for LV Cut-
outs
Oct 2014  Change in Specification for marker tape Richard Summers
 Addition of combined CT/Cut-out panels
 Changes in the Approved 2 and 4 way
Linkboxes from Tyco
 Harmonization of all 11kV jointing and
Oct 2014 Peter White
cable systems within WPD

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 WESTERN POWER DISTRIBUTION

HOUSING DEVELOPMENT MATERIALS FRAMEWORK DLH SPECIFIC

APPENDIX

1.0 Introduction

1.1 Information contained in this Framework Appendix must be read in conjunction with the
National Framework Documents, the Adoption Agreement, the other two Western Power
Distribution (WPD) Housing Development Framework Appendices relating to
Installation and Design and the WPD Framework Appendix on cable recording
techniques.

1.2 In the event of query please speak to the WPD Planner acting as the focal point of contact
for the scheme. If other than the listed materials or makers are proposed, please pass
detailed information to the WPD Planner, who will make contact with the relevant
Specifier within WPD to provide a response. Full details of any proposed variation are
required, including;

 makers name and place of manufacture

 makers type reference
 rating information
 any applicable COSHH data sheets

2.0 HV switchgear

2.1 WPD require non-oil designs of HV switchgear. WPD’s current suppliers of HV Ring
Main type equipment are Schneider Electric (Ringmaster range) and Lucy (Sabre range).

3.0 HV/LV Transformers

3.1 HV/LV transformers are purchased to WPD specification based on EATS 35-1. WPD
specify maximum acceptable losses for the ratings of transformers employed; 500, 800
and 1000kVA as below.

Three phase-rating KVA 500 800 1000

No load loss W 510 650 770
Load loss W 5500 8400 10500

3.2 Limitation of transformer noise is important to WPD; please note that specified noise
limits are included in ENATS 35-1 and the WPD spec, but are not included in
BS EN60076.

3.3 Transformer oil must be certified as being free of PCBs < 2ppm. Transformer oil must
comply with BS 148.

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 4.0 LV Fuse cabinets, fuseboards and fuse pillars

4.1 Shall comply with ENATS 37-2.

4.2 Provision for connecting a generator as detailed in Clause 7.1.1.f of ENATS 37-2 shall be
provided.

The connection from the transformer side to the synchronising reference fuses shall be
double insulated and of not less than 16mm2.

Female ‘Litton’ connectors (or equivalent) shall be provided on each busbar and the
neutral/earth bar to allow the safe connection of generator cables onto live SCDB’s.

The connections shall be rated at 600A.

Evidence of temperature rise tests shall be supplied at the time of tender, with the
generator cables carrying the full 600A current and the adjacent outgoing ways arranged
to obtain current balance.

The cabinet/pillar doors shall be able to be closed and locked with the generator cables
connected.

5.0 HV/LV substation enclosures

5.1 HV/LV substations shall be situated indoors; normally within a glass reinforced plastic
(g.r.p) enclosure. All g.r.p. enclosures shall meet WPD specification as set out below.
Dimensions are for unit type arrangements employing Schneider Ringmaster non
extensible ring main or circuit breaker equipments.

5.2 Introduction

This specification covers the sizes, material and physical design of GRP enclosures,
roofs, doors and panels suitable for the WPD’s Distribution Substations.

5.3 General

This specification details the minimum permissible standard. Suppliers may submit
alternative designs for consideration and approval by WPD.

All designs must take into account the often severe, climatic conditions experienced in
the South West of England, South Wales and coastal areas of East Midlands Suppliers
shall be able to demonstrate that all equipment supplied will be 'Fit For Purpose'.

All items shall have sufficient protective packaging to prevent any damage in transit.

All enclosures, when erected, shall offer degrees of protection against solid foreign
objects and against water by having an 'IP Rating' of IP23, or better, as described in BS
EN60529:1992.

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 When installed, the interface between the base of the enclosure and the plinth shall be
sealed against the ingress of water.

Holes cut in the GRP in order to accommodate ventilation panels shall be coated to seal
the cut edges.

5.4 Explosion relief

All prefabricated distribution substation housings shall be subjected to a type test in

which the effects of an internal arc within a sealed chamber mounted inside the enclosure
are demonstrated. The arc energy shall be 250 MVA (13.1kA) for 1 second. This may
be achieved either by test at an accredited short circuit test station, or by a synthetic
fuel/air explosion. Full details of the proposed method shall be submitted for approval.
The method detailed in the BRE confidential report TCR 20/97 is approved.

The pass criteria for the test shall include:-

Doors to remain closed and latched.

Minimum projection of flame through door and joint gaps.
No breakage of wall or roof material or any building joints.
If pressure relief is achieved by a lifting and tethered roof, then the roof shall return to its
original position.
Deflection of any ejected flame away from persons directly adjacent to the housing.
Tests to be recorded on high speed video recorder for consideration.

Housings which have been previously tested shall have the type test evidence submitted
for consideration at the time of tender. The undertaking of a type test for each contract is
not required, however significant design changes to a tested design will require a new
test.

Significant design changes may include, but are not limited to:

(a) A 10% change in housing volume

(b) A 10% increase in door width
(c) A 10% change in available roof lift (if applicable)
(d) Any change in floor fixing or position
(e) Any change in panel joint system
(f) Any change of panel material composition
(g) Any change in door locking systems and their fixing
(h) Changes in ventilation grille type and position

The judgement on the acceptability of the housing design as having passed the explosion
test will be based on:

(a) A high speed video, to the requirements of BRE test report TAR 20/97.
(b) The written report of the approved testing Authority.

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 5.5 Materials and stiffening

All items shall be manufactured using glass fibre polyester resin. Except where
otherwise stated they will be made from at least three layers of 450 grams glass fibre per
square metre, having an overall minimum thickness of 4mm. and gel-coated on all
external and internal surfaces. Both sides of all finished, completed assemblies shall be
constructed to BS476 Part 7 Class II, or equivalent, as a minimum standard - (Surface
Spread of Flame). Suppliers shall confirm the standard to which items have been
constructed, together with the method of construction of all component parts. NOTE: Use
of Class II listed resin does not necessarily achieve this result.

Both sides of all finished, completed assemblies shall be constructed to BS476 Part 12
taking Source F as the 'real' ignition source as a minimum standard. An equivalent
standard may be used but in any case suppliers shall confirm the standard to which items
have been constructed.

If tests for fire resistance to BS476 Part 20, or equivalent, have been conducted, the
supplier will advise the results of these tests, separately, in respect of walls, doors and
roof for stability, integrity and insulation.

Unless panels are completely gel-coated on all internal and external surfaces, all timber
used in the course of manufacture will be 'pressure impregnated'. All timber used will
have bevelled edges and be fully encapsulated between layers of GRP.

All plyboard used in the course of manufacture will be 'WPB grade' and have a minimum
thickness of 12mm. All plyboard will be fully encapsulated between layers of GRP.

The standard colour of completed assemblies shall be Buff BS4800 08-B-21 in a smooth
gel-coat finish which is maintenance free and UV resistant. Other colours or finishes may
be requested from time to time where site conditions so dictate.

The exterior appearance of all panels shall be aesthetically acceptable. Suppliers shall
provide detailed proposals with tenders.

5.6 Fittings

In order to avoid creation of electrolytic corrosion cells, all metallic fittings, unless
otherwise stated, shall be of stainless steel in a grade to be agreed between purchaser and
supplier. As alternatives, ventilation panels may be constructed of suitable grade hot
dipped galvanised mesh and door hinges may be suitable grade brass.

All panels, including those provided with enclosures and wicket panels, shall be secured
by a hasp and staple arrangement able to accept a lock with a 7mm hasp. Enclosures and
double door sets shall have top and bottom internal drop bolts fitted on the door fitted
with the staple.

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 Compton 'type 10/10 door stays', or equivalent where otherwise approved, shall be
provided in order to hold all doors in the 90 degree position whilst open. Type 1 and
Type 2 wicket panels do not require a stay, but a second staple must be provided to
secure the door in the 180 degree open position.

Enclosure fixing brackets shall be provided to connect between panels and roof, and
between panels and ground/walls. Foundation fixings shall be in the form of brackets
bolted to the front and rear box sections. All fixings for joining component parts, i.e.
walls, doors etc., including hinges, door bolts, padlocking points etc., shall be accessible
only from within the enclosure.

5.7 Enclosures

Enclosures shall normally be supplied in the five sizes detailed below. However, there
may be a requirement for alternative sizes to be supplied when site conditions so dictate.

(i) 3050mm width, 2225mm depth, 2300mm height, (clear inside dimensions), - Unit
Substation Enclosure, - diagram1.

(ii) 3050mm width, 1830mm depth, 2300mm height, (clear inside dimensions, - Unit
Substation Enclosure, - diagram1.

(iii) 2462mm width, 1830mm depth, 2300mm height, (clear inside dimensions), - Unit
Substation Enclosure, - diagram 1.

A welded steel box frame of cross section at least 40mm x 40mm x 3mm to be fully
laminated into the periphery of the front and rear of the enclosure. Timber reinforcing
members at least 75mm x 32mm shall be positioned as shown in diagram 2 to further
strengthen the enclosure.

With the exception of mini switch covers, which will have one opening door, all
enclosures will be constructed with a set of double doors, dimensioned so as to fill the
area available within the steel box reinforced front frame.

Enclosure roofs shall be 'tight fitting'. With the exception of Mini Switch Covers, roofs
shall be constructed of a single section which is double skinned, reinforced, pitched and
domed with no joints, and with a steel angle encapsulated inside the bottom edge of the
roof to provide fixing points to the side. In order to minimise condensation, the roof shall
be polyurethane foam filled with a minimum foam thickness of 18mm. It will be able to
withstand a single 100kg load over an area of 300mm x 300mm at any position with no
more than a 25mm deflection, and without permanent damage. Threaded sockets shall be
provided on the top of the roof to accept lifting eyebolts. The sockets shall be sealed in
order to prevent the ingress of moisture and must be fixed such that, when eyebolts are
fitted to all sockets, the roof can safely and without damage, be lifted and lowered using
only these points. Suitable eyebolts shall be provided where specified. In order to reduce
weight, Mini Switch Cover roofs shall be single skin as previously specified and provided
without threaded sockets for eyebolts.

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 Suitable eyebolts shall be provided when requested to do so which conform to the
Factories Act 1961, Regulation 26, and the Construction (Lifting Operations) Regulations
1961, Regulation 10. Test Certificates shall be provided for each eyebolt supplied.
Where suppliers provide lifting brackets as an alternative to eyebolts, they will be subject
to the above regulations.

The weight of each panel, including the roof, shall be clearly stencilled on the inside
panel face and, in addition, where suppliers confirm in writing that the complete
enclosure may be lifted by means of eyebolts or lifting brackets, the weight of the
complete structure must be clearly stencilled on the inside of the roof.

Ventilation panels, shall be fitted to the top and bottom of enclosures in positions to be
agreed between purchaser and supplier and will be covered by approved cowls. Before
the fitting of cowls, each unit substation enclosure will have ventilation of 0.80 sq. metre
net free area shared equally between the top and bottom of the enclosures, positioned in
the top and bottom rear corners of the side panels and the four corners of the rear panels
as indicated on the attached drawings. Switchgear enclosures will have ventilation of 0.02
sq. metre net free area shared equally between the top and bottom of the enclosure.

From time to time it may be necessary to vary the amount of ventilation in Unit
Substation Enclosures. All Unit Substation Enclosures shall be supplied with sufficient
approved ventilation panel blanking plates to blank off all, but two, panels. Blanking
plates shall be securely attached on the inside of the enclosure. A labelled storage facility
shall also be provided within each enclosure for any blanking plates which are not in use.
The positioning of this 'store' will be agreed between purchaser and supplier.

5.8 Vandal Resistant Enclosures. (When Specified)

Except where stated below 'Vandal Resistant Enclosures' shall be constructed to the
specification described previously.

Such enclosures shall be robust in order to withstand vandal attack. The walls, doors and
roof shall be constructed from GRP inner and outer skins totally encapsulating a rigid
plywood core. Plywood may be laminated into the construction in a number of sections
provided a continuous core is maintained. Ventilation louvres and grilles shall be vandal
resistant.

The following information will be required with the tender:

(i) Thickness of plywood reinforcement offered.

(ii) Grade of plywood reinforcement offered.

(iii) Number of GRP laminations on each face of the plywood.

(iv) Material and construction of framework for corner posts, walls, roof, door frame
and doors.

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 (v) Materials of hinges, stays, locking facilities, and ventilation louvres and grilles.

(vi) Information on BS476 Parts 7, & 12, or equivalent, fire tests, shall be provided
and Part 20 tests shall be provided if available.

(vii) List of customers to whom similar enclosures have been provided, with particular
respect to UK. Electricity Companies.

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 Diagram 1

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 Diagram 2

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 6.0 WPD list of materials and suppliers.

(see clause 1.2 in relation to proposal of alternatives)

Component WPD Specification National Manufacturer Size / Type

Specification

Earth Rods ENATS 43-94 W Furse - Nottingham

CBS Products – Oakham
ERICO (GB)
Hockey Stick (Bend) Polypipe Civils 38mmx90inch

Alkathene Tubing ENATS 12-23 Polypipe Civils

and BS EN12613
Marker Tape ENATS 12-23 Allied Conductors 150mm x 0.1mm
Marker Boards x 365m
Fuses (LV) BS88 Part 5 Cooper Bussmann UK Ltd - 100A Slot 92mm
Bourton On Wold, Leics 160A Slot 92mm
Lawson Fuses Ltd, Ponteland, 200A Slot 92mm
Newcastle Upon Tyne 250A Slot 92mm
315A Slot 92mm
355A Slot 92mm
400A Slot 92mm
500A Slot 92mm
630A Slot 92mm
Transformer Fuse WPD ENATS 37-2 Schneider – Scarborough Type V 800A, 4 Way
LV Cabinet EE SPEC 16/5 W Lucy & Co – Thame
Type VII 1600A, 4 Way

Type XIV 1600A, 2 Way +

1250A MCCB

Type XII 800A, 2 Way + 800A

MCCB

Type XIII 1600A, 2 Way +

800A MCCB

Type IX 1600A, 5 Way

LV MCCB Metering WPD Schneider – Scarborough
intake panel EE SPEC 28/5
( see WPD
Framework
Appendix 4 )
Transformers WPD ENATS 35-01 CG – Cavan 500kVA Cable
11/0.433kV Ground EE SPEC 5/5 Schneider - Turkey 500kVA Unit
Mounted 800kVA Cable
800kVA Unit
1000kVA Cable
1000kVA Unit
Transformers WPD ANSI C57-12- Cooper/Langley Engineering,
11/0.433kV EE SPEC 5/5 26, ANSI C57 – Theale
12-25
12kV circuit breaker WPD ENATS 41-36 Schneider – Leeds TXF Mounted SF6
(fuse switch equiv) EE SPEC 2/5 W Lucy & Co – Oxford Free Standing SF6
SF6

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 Component WPD Specification National Manufacturer Size / Type
Specification

12kV circuit breaker WPD ENATS 41-36 Schneider – Leeds TXF Mounted SF6
(fuse switch equiv) EE SPEC 2/5 W Lucy & Co – Thame Free Standing SF6
SF6

12kV circuit breaker WPD ENATS 41-36 Schneider – Leeds TXF Mounted RMU
Ring Main Unit SF6 EE SPEC 2/5 W Lucy & Co – Thame Free ST RMU
12kV circuit breaker WPD ENATS 41-36 Schneider – Stafford
vacuum or SF6 EE SPEC 3/3 FKI – Blackwood
Siemens – Manchester
Insulating oil BS148 + EOS
(for transformer) PCB<2PPM
GRP Enclosure WPD Morgan Marine - Swansea V Resistant
with internal arc EE SPEC 19/6 3050x2225x2300mm
pressure relief 3050x1830x2300mm
Unit S/S Enc
3050x1830x2300mm
3050x2225x2300mm
Link Disconnection WPD EE SPEC 114 Prysmian (2 or 4 way) Insulated Type/Resin
Boxes Filled

Sicame (2 or 4 way) 2W Sicame Mk3

4W Sicame Mk3
Cut-Out (100A) BS 7657 WT Henley - Single Phase 100A
With Fire Retardant Three Phase 100A
Cut-out Board
Cut-Outs (Heavy WPD EE SPEC: Lucy Switchgear 400A
Duty) 117 600A
Combined CT / cut- WPD EE Spec Lucy Switchgear 200A – THM0043083
out panels 119/1
Street Lighting WPD EE SPEC 116 W T Henley - CNE 1 pole 54715-49
Cut-Out (25A) CNE 2 pole 54715-51
SNE 1 pole 54715-50
Cut-Out Fuse BS88 Sec 3 Cooper Bussman – 5A Type IIA
BS1361 Bourton On Wold, Leics 15A Type IIA
Lawson Fuses Ltd, Ponteland, 30A Type IIA
Newcastle Upon Tyne 45A Type IIA
60A Type IIA
80A Type IIA
20A Type IIB
60A Type IIB
80A Type IIB
100A Type IIB
Street Lighting Cut- BS7654 Cooper Bussman – Bourton On 6A
Out Fuse Wold, Leics 10A
Lawson Fuses Ltd, Ponteland, 16A
Newcastle Upon Tyne 20A
25A

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 Component WPD Specification National Manufacturer Size / Type
Specification

Meter Cupboard ENATS 12-03 Matris Composites UK Ltd - Small Gas Com EA12-3
Stoke on Trent Modified Large Meter
Ritherdon & Co - Darwen, Box Surface Mounted
Lancs Standard Large Meter
Autopress Composites – Box Fire Resistant Small
Stoke on Trent
Meter Boards Wootton & Co 490x490 to SWEB
Shaw Timber - Huddersfield G4008
300x300 Wall Mounting
575mmx375mm
Medium
650x460mm Large
490x330 Autopress
500x340 Hampton Small
Box
Multi-service WPD SPEC Lucy Switchgear 7 Way – THM0029785
Distribution Board EE118/1 10Way – THM00133667
12 Way – THM0021311
18 Way – THM0021313
24 Way – THM0021315
36 Way -
Underground ENATS 09-07 Tratos Cables 25mm 1PH SNE Cu
Service Cable Plain Conc 25mm 1PH SNE SAC
BS 7870 35mm 1PH CNE SAC
Part 3.11 25mm 3PH SNE Cu
BS 7870 35mm 3PH CNE SAC
Part 3.21 35mm 3 PH CNE Cu
Split 35mm 3PH SNE Cu

Underground BS 7870 Tratos Cables 25mm 1PH SNE Cu

Service Cable LSF Part 3 35mm 1PH CNE SAC
25mm 3PH SNE Cu
35mm 3PH CNE SAC
35mm 3 PH CNE Cu
35mm 3PH SNE Cu
Joint Resin WPD SPEC HD 631.2 TE Connectivity 3 Pt Poly 1.3L
EE105/1 W T Henley 3 Pt Poly 5L
3 Pt Poly 6.5L
3 Pt Poly 3.2L
Connectors LV All connections / IEC 61238-1 TE Connectivity (B&H) MSIP – service
Mains joints joints to be made in UST – straight
accordance with USBT1 – straight
ST:CA0 and +service
ST:CA1 (section 7) UBR – branch
UBRD – cut main
branch
BCNE-3UTB – neutrals
TAI, TA II & TAIII –
Consac neutral
VETA-33P-UTB

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 Component WPD Specification National Manufacturer Size / Type
Specification

Connectors LV All connections / IEC 61238-1 Sicame

service joints to be made in
accordance with
ST:CA0 and
ST:CA1 (section 7)

Connectors LV All connections / IEC 61238-1 TE Connectivity (B&H) LVET lugs

terminations joints to be made in BET lugs
accordance with ML lugs
ST:CA0 and
ST:CA1 (section 7)
Earth Electrode All connections / TE Connectivity LVCU 1700/5
joints to be made in
accordance with
ST:CA0 and
ST:CA1 (section 7)
LV Mains Cable BS 7870 Part 3- Prysmian 300mm2 Wavecon
3 & 4 Core (Normal) 40 Waskonig & Walter 185mm2 Wavecon
95mm2 Wavecon
LV Mains Cable BS 7870 Part 3- Waskonig & Walter 300mm2 Wavecon
3 & 4 Core (LSF) 50 185mm2 Wavecon
95mm2 Wavecon
LV Single Core EE75 BS 5467 Prysmian 600mm2
Solid Al Cables 740mm2

11kV Compound - WPD EE SPEC: HD 628 & 629 Lovink Lovisil

Jointing Compound 112

11kV EPR WPD EE SPEC: BS 7870 Part Prysmian Cables & 630 mm2
Single Core Cable 82/1 4.10 Tratos Cables
Cu
HV Earthing (U/G) ENATS 41-24 Johnson - Wakefield

11kV EPR single WPD EE SPEC: BS 7870 Part Prysmian Cables & 95 mm2
core cable solid Al 82/1 4.10 Tratos Cables
conductor
11kV EPR Triplex WPD EE SPEC: BS 7870 Part Prysmian Cables & 95 mm2
solid Al conductor 82/1 4.10 Tratos Cables 185 mm2
300 mm2

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 Component WPD Specification National Manufacturer Size / Type
Specification

Connectors 11kV WPD EE SPEC: IEC 61238-1 TE Connectivity (B&H) BAH-02-403-0127

terminations 111 BAH-02-403-0100
BAH-02-403-0128
BAH-02-403-0129
VETB33-12UTB
VETC330HUTB
VETB28-12/16 UTB
VETB28-OHUTB
BET lugs
LBE 95
Connectors 11kV WPD EE SPEC: IEC 61238-1 TE Connectivity (B&H) MSFE-0009-0035/0185
111 MSFE-0010-0035/0300
BAH-02-211-0098
VTPC36UTB
HVBRM18SPUTC
HVBRM22SPUTC
HVBRM18SOUTC
HVBRM22SOUTC

11kV Terminations WPD EE SPEC: HD 628 & TE Connectivity 70-95mm² indoor CSTI-
Indoor & Outdoor 112 HD 629 3121-GB01, 185 to
300mm2
Indoor CSTI-3131-
GB01, 400-630mm²
CSTI-3141-GB01&
Outdoor 70-95mm²
outdoor CSTO-3121-
GB01, 185 to 300mm²
outdoor CSTO-3131-
GB01, 400-630mm²
CSTO-3141-GB01
11kV Straight Joints WPD EE SPEC: HD 628 & Lovink K85 - 95 to 185 mm2
K95 - 185 to 400 mm2
112 HD 629
11kV Stop Ends WPD EE SPEC: HD 628 & Lovink K85 - 95 to 185 mm2
K95 - 185 to 400 mm2
112 HD 629
11kV Live Break WPD EE SPEC: HD 628 Nexans (Euromold) 95 mm2
Elbows and Bushing 112
well insert
11kV Branch Joints WPD EE SPEC: HD 628 & Lovink 95 to 185 mm2
112 HD 629 185 to 300 mm2
11kV Loop Joints WPD EE SPEC: HD 628 & Lovink 95 to 185 mm2
112 HD 629 185 to 300mm2
WPD EE SPEC: HD 629.1 S1 Nexans (Euromold) 630mm² single -
11kV Separable 112 for 630mm2 for 300mm² K440TB/G-32-TMBC400-
Connectors 630 MWS
630mm² double -
K440TB/G-P2-32 TMBC
400-630MWS;
300mm² - K400TB/G-
25-TMBC120-300 MWS
HD 629.1 S1 Nexans (Euromold) K430TB/G
for Lucy Sabre Mk2 RMU

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 LV & HV Jointing

LV joints and terminations shall normally be made ‘colour true’.

Much of the LV network runs at National Standard phasing. However, some isolated
parts of the LV network may have non-standard phase rotation or may be 30 degrees
displaced from National Standard due to historical crosses on the local HV system. There
are also many instances of HV & LV cores being crossed and/or rolled between
switchgear, transformer and LV feeder pillar in existing substations.
Where the project requires LV interconnection it may be necessary to cross the LV
connections in the substation LV feeder pillar. Where a local 30 degree displacement
exists the HV busbars of the substation may have to be commissioned non-standard. The
Applicant should seek advice from WPD in these cases.

Most HV projects will require that a National Standard reference be established at an

adjacent substation prior to jointing in the new substation. The Applicant should seek
advice from WPD in all cases.

HV cable terminations shall not be physically crossed inside cable boxes under any
circumstances. The correct phasing of the busbars shall be established by crossing cores
in joints where necessary.
The colour conventions commonly encountered in the WPD include, but are not limited
to:
Plant New cables Examples of local historical
National colours
Standard HV LV HV or Core Number British Harmonised PILSTA Leicester plain
LV Standard European PILSWA lead cables
Standard
L1 A a U 1 Red Brown Red Brown
L3 B b V 2 Yellow Black Yellow or Green
White
L3 C c W 3 Blue Grey Blue Red
N n N 0 Black Blue Green or Blue
Black

The Applicant must not assume that any marking on cables or plant represent National
Standard phases. Some parts of the WPD system has non-standard phasing as a legacy of
individual electric power undertaking’s local standards inherited at nationalisation in
1947.

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