BS 7870-4.20:2011+A1:2016
LV and MV polymeric insulated cables for use by distribution and generation utilities Specification for distribution cables with extruded insulation for rated voltages of 11 kV to 33 kV
| Standard number: | BS 7870-4.20:2011+A1:2016 |
| Pages: | 28 |
| Released: | 2016-06-30 |
| ISBN: | 978 0 580 93807 8 |
| Status: | Standard |
BS 7870-4.20:2011+A1:2016
This standard BS 7870-4.20:2011+A1:2016 LV and MV polymeric insulated cables for use by distribution and generation utilities is classified in these ICS categories:
- 29.060.20 Cables
This section of BS 7870 specifies requirements for the construction, dimensions and mechanical and electrical properties of 6.35/11(12) kV three-core cables having either aluminium or copper conductors, cross-linked polyethylene (XLPE) or ethylene propylene rubber (EPR) extruded insulation, a copper wire metallic screen and an oversheath of one of the following compounds.
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medium density polyethylene (MDPE) compound type DMP 5 (Type A cables);
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thermoplastic compound type DMZ 4 for cables having a low emission of smoke and corrosive gases when affected by fire (Type B cables).
This section of BS 7870 is applicable to cables that are designed for a maximum continuous conductor operating temperature of 90 °C and for a maximum short-circuit conductor temperature of 250 °C.
Information to be supplied by the purchaser, and items to be agreed between the purchaser and the manufacturer at the time of enquiry and/or order are given in Annex B. Guidance on type testing is given in Annex C.