NPG Northern Power Grid Cable Protection & Tapes & Covers (LV MV HV)
Published 07 Nov 2017

NPGÂ 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 NPGÂ 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.
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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
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NPG Northern Power Grid NSP 002 Policy For The Installation Of Distribution Power Cables Size: 387.20 KB