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NPG Northern Power Grid Cable Protection & Tapes & Covers (LV MV HV)

Published 07 Nov 2017

NPG Northern Power Grid Cable Protection & Tapes & Covers (LV MV HV)

NPG LV MV HV 11kV 33kV | Tile Tape | Stokbord Covers

Northern PowerGrid Tile Tape & Stokbord Covers

Northern Powergrid, NPG, are a UK Distribution Network Operator distributing low and high voltage electricity covering North East England, –  we overview current NPG recommendations and specifications for Cable Protection Tapes & Covers using Tile Tape and Stokbord products.

This should assist LV-HV Cable Jointing, Installation & Civil Engineering Contractors installing the appropriate level of LV-HV Cable Protection for underground power cables.

T&D are Approved Vendors to NPG and their contractors providing competitive prices and technical support for LV, MV & HV Cable Installation, Jointing, Substation & Electrical Equipment.

Trenchless Excavation

Where appropriate, trenchless excavation shall be considered as a viable option when installing underground cable. Application of this option shall always employ the cable being laid in a suitable and approved duct as shown below.

 

Trenchless Installation Duct Requirements
Cable Type Cable Size Duct (Outside Diameter)
Metallic Auxiliary All 125mm PE SDR-11 Black
Fibre Auxiliary All 125mm PE SDR-11 Black
Fibre Auxiliary (Sub-Duct) All 32mm PE SDR-11 Black
LV Service All 75mm PE SDR-11 Black
LV Main All 125mm PE SDR-11 Black
11kV to 20kV Triplex up to 300sqmm 125mm PE SDR-11 Black
Triplex above 300sqmm 160mm PE SDR-11 Black
33kV Single Core 160mm PE SDR-11 Black
Triplex up to 400sqmm 160mm PE SDR-11 Black
66kV to 132kV All 180mm PE SDR-11 Black

 

All ducting used in trenchless excavation shall be solid wall circular section duct (SDR-11) as specified in ENA-TS 12-24 – ‘Plastic Ducts for Buried Electric Cables 2008’and NPS/002/003 – ‘Technical Specification for Protective Tile, Tile Tape and Cable Ducting’ and all cables require advanced warning and this will normally be in the form of an embossed black duct compliant with ENA-TS 12-24 – ’Plastic Ducts for Buried Electric Cables 2008’.

Open Cut Trench

Open Cut Trench Installation Requirements
Cable Type Cable Size Public Footpath (OD / ID mm) Private Domestic (OD / ID mm) Private Non-Domestic (OD / ID mm) Road (OD / ID mm)
Metallic Auxiliary All 96.5/90 Duct & Tile Tape 96.5/90 Duct & Tile Tape 96.5/90 Duct & Tile Tape 96.5/90 Duct & Tile Tape
Fibre Optic Auxiliary All 96.5/90 Duct & Tile Tape 96.5/90 Duct & Tile Tape 96.5/90 Duct & Tile Tape 96.5/90 Duct & Tile Tape
LV Service All Laid Direct & Tile Tape 38/34 or 46 Duct & Tile Tape Laid Direct & Tile Tape 150/125 Duct* & Tile Tape
LV Main All Laid Direct & Tile Tape 150/125 Duct* & Tile Tape Laid Direct & Tile Tape 150/125 Duct* & Tile Tape
11kV to 20kV Up to 300sqmm Laid Direct & Tile Tape 175/150 Duct* & Tile Tape Laid Direct & Tile Tape 150/125 Duct* & Tile Tape
Above 300sqmm Laid Direct & Tile Tape 175/150 Duct* & Tile Tape Laid Direct & Tile Tape 175/150 Duct* & Tile Tape
33kV Triplex up to 400sqmm 160/150 Duct & Tile Board 160/150 Duct & Tile Board 160/150 Duct & Tile Board 160/150 Duct & Tile Board
All Single Core 160/150 Duct & Tile Board 160/150 Duct & Tile Board 160/150 Duct & Tile Board 160/150 Duct & Tile Board
66kV to 132kV All Single Core 160/50 Duct & Tile Board 160/150 Duct & Tile Board 160/150 Duct & Tile Board 160/150 Duct & Tile Board

*Assumes twin wall ducting. All others are single smooth wall design.

All sizes for ducts installed in open trenches are nominal diameter measurement and should have tile tape or tile board installed above the cables / ducts ensuring an overlap of 50mm either side of the cable(s)/duct(s).

Cables in the range 230V to 20kV shall be laid under tile tape positioned 150mm directly above the top of the uppermost cable / duct and 33kV to 132kV shall be laid under tile boards positioned 75mm directly above the top of the uppermost cable / duct with each tile board shall be closely interlocked with adjacent covers throughout the length of the cable.

All ducting used in open trench excavation shall be used as part of cable installation works shall be as specified in NPS/002/003 – ‘Technical Specification for Protective Tile, Tile Tape and Cable Ducting’.

Cables installed for future jointing to existing cables shall be adequately overlapped to allow easier jointing.

➡ View our complete range of LV-HV Cable Protection.

Cable Pulling & Laying Equipment LV HV

T&D supply Utilities & Approved Contractors with cable pulling products including cable rollers, cable socks and drum lifting jacks to enable the installation of low voltage and high voltage cables intro trench or duct: this includes single core, 3 core and Triplex 11kV/33kV power cables and LV waveform, mains and service cables.

Further Reading