BS 7870-4.20:2011 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. Three-core 11 kV cables
This section of BS 7870 specifies requirements for the construcion,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 insulaiton,a copper wire metallic screen and an oversheath of one of the following compounds.
a) medium density polyethylene (MDPE) compound type DMP 5 (Type A cables);
b) 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℃ and for a maximum short-circuit conductor temperature of 250℃.
BS 7870-4.20:2011 Referenced Document
BS 7870-1 LV and MV polymeric insulated cables for use by distribution and generation utilities Part 1 : General
BS 7870-2 LV and MV polymeric insulated cables for use by distribution and generation utilities. Methods of test (Implementation of HD 605 S3:2019)*， 2022-11-30 Update
BS EN 50267-2-1 Common test methods for cables under fire conditions - Tests on gases evolved during combustion of materials from cables - Procedures - Determination of the amount of halogen acid gas - Determination of the amount of halogen acid gas
BS EN 60811-1-2 Common test methods for insulating and sheathing materials of electric and optical cables — Part 1 - 2 : General application — Thermal ageing methods
BS EN 60811-1-3 Insulating and sheathing materials of electric and optical cables — Common test methods — Part 1 - 3 : General application — Methods for determining the density — Water absorption tests — Shrinkage test
BS EN 60811-2-1 Insulating and sheathing materials of electric and optical cables — Common test methods — Part 2 - 1 : Methods specific to elastomeric compounds — Ozone resistance, hot set and mineral oil immersion tests
BS EN 61034-1 Measurement of smoke density of cables burning under defined conditions. Test apparatus
BS EN 61034-2 Measurement of smoke density of cables burning under defined conditions - Test procedure and requirements*， 2020-03-31 Update
BS 7870-4.20:2011 history
1970BS 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. Three-core 11 kV cables(Implementation of HD 620)
2011BS 7870-4.20:2011 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. Three-core 11 kV cables
1999BS 7870-4.20:1999 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 and 33 kV - Three-core 11 kV cables - Three core 11 kV cables