BS 7835:2007

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Voltage designation
5 Non-metallic materials
6 Conductors
7 Conductor screen
8 Insulation
9 Insulation screen
10 Assembly of three-core cables, including inner coverings
   and fillers
11 Metallic layer
12 Metallic armour
13 Oversheath
14 Marking
15 End sealing
16 Schedule of tests
17 Test conditions
18 Routine tests
19 Sample tests
20 Type tests - Materials
21 Type tests - Electrical
Annexes
Annex A (informative) - Recommendations for the selection of cables
Annex B (normative) - Information to be supplied and items to be
                      agreed
Annex C (informative) - Recommendations for the installation of
                        cables
Annex D (informative) - Guide to use of cables
Annex E (normative) - Fictitious calculation method for determination
                      of dimensions of protective coverings
Annex F (normative) - Rounding of numbers
Annex G (informative) - Guidance on the scope of type tests
Annex H (normative) - Thickness measurements
Annex I (normative) - Test method for cold strippability of the
                      extruded semi-conducting layer of an
                      insulation screen
Annex J (normative) - Method for measurement of resistivity of
                      extruded semi-conducting conductor screen
                      and insulation screen
Annex K (normative) - Method for measurement of resistivity of
                      lapped inner covering
Annex L (normative) - Wet compatibility test for galvanized
                      steel wires and semi-conducting tape
                      layers
Annex M (normative) - Abrasion test
Annex N (normative) - Test for shrinkage of oversheath on cable
Annex O (normative) - Insulation resistance constant test on
                      oversheath
Bibliography

Describes requirements and test methods for the construction, dimensions and mechanical and electrical properties of armoured cables with thermosetting insulation for rated voltages from 3.8/6.6 (7.2) kV up to 19/33 (36) kV inclusive.

This British Standard specifies requirements and test methods for the construction, dimensions and mechanical and electrical properties of armoured cables with thermosetting insulation for rated voltages from 3.8/6.6 (7.2) kV up to 19/33 (36) kV inclusive which, when assessed by the specified tests, produce lower levels of smoke and corrosive gases on exposure to fire compared to the cables specified in BS 6622. It covers cables designed for a maximum continuous conductor operating temperature of 90 °C and for a maximum short circuit conductor temperature of 250 °C, for use in fixed installations such as networks or industrial installations.

This British Standard specifies single-core and three-core cables for voltages in the range 3.8/6.6 (7.2) kV up to 19/33 (36) kV, with:

• a stranded copper, stranded aluminium or solid aluminium conductor or conductors;
• cross-linked polyethylene or cross-linked ethylene propylene rubber insulation;
• a metallic screening layer of copper wire or copper tape and/or a metallic armour of aluminium or galvanized steel wire;
• a thermoplastic oversheath.

NOTE Guidance on the selection of cables is given in Annex A. 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. Recommendations for the installation of cables are given in Annex C. Guidance on the use of cables is given in Annex D.