BS 7870-4.20:2011+A1:2016

BS 7870-4.20:2011+A1:2016 specifies requirements for the construction, dimensionsand mechanical and electrical properties of 6.35/11(12) kV three-core cableshaving either aluminium or copper conductors, cross-linked polyethylene (XLPE)or ethylene propylene rubber (EPR) extruded insulation, a copper wire metallicscreen and an oversheath of one of the following compounds.

• medium density polyethylene (MDPE) compound type DMP 5 (Type Acables);
• thermoplastic compound type DMZ 4 for cables having a low emission ofsmoke and corrosive gases when affected by fire (Type B cables).

This section of BS 7870 is applicable to cables that are designed for a maximumcontinuous conductor operating temperature of 90 °C and for a maximumshort-circuit conductor temperature of 250 °C.NOTE Information to be supplied by the purchaser, and items to be agreedbetween the purchaser and the manufacturer at the time of enquiry and/or orderare given in Annex B. Guidance on type testing is given in Annex C.To be read in conjunction with BS 7870-1:2011,BS 7870-2:2011Cross References:BS 3988:1970+A3:1989BS 7870-1BS 7870-2BS EN 50267-2-1 BS EN 60228:2005BS EN 60332-1-2:2004BS EN 60332-3-24:2009BS EN 60811-1-2BS EN 60811-1-3BS EN 60811-2-1BS EN 61034-1BS EN 61034-2HD 603 S1HD 605 S2HD 620 S2HD 626 S1HD 627 S1IEC 60502-2Incorporates the following:Corrigendum, August 2012. Amendment, June 2016. Amends and replaces BS 7870-4 .20:2011