BS 7970:2012

This standard BS 7970:2012 Electric cables. Metal foil and longitudinally welded aluminium sheath constructions of power cables having XLPE insulation for rated voltages from 66 kV (U_m = 72.5 kV) to 132 kV (U_m = 145 kV) is classified in these ICS categories:

• 29.035.20 Plastics and rubber insulating materials
• 29.060.20 Cables

This British Standard specifies requirements for construction and performance, and gives methods of test, for metal wire and foil sheath, or metal wire and longitudinally welded aluminium, or longitudinally welded aluminium constructions of power cables having XLPE insulation for rated voltages from 66 kV (U_m = 72.5 kV) to 132 kV (U_m = 145 kV). The tests and requirements in this British Standard are additional to the tests and requirements for cables and their accessories specified in BS 7912.

NOTE 1 In exceptional cases, with very low fault currents, foil sheath designs without metal wires may also be used.

NOTE 2 Tests described in BS 7912:2012, 15.2, 15.3 and 15.4 are not required in this standard.

This British Standard is applicable to single-core cables for usual conditions of installation and operation, but not to special cables, such as those designed for submarine applications.

NOTE 3 Annex A gives requirements for a die penetrant test for weld integrity. Annex B lists a test for peel strength of overlapped metal foil. Annex C lists test requirements for adhesion strength of metal foil. Annex D covers the test for impact and Annex E the test for sidewall loading. Annex F covers the test for corrosion.