Three tables are included here, BS 6004 PVC thermosetting flat twin and earth, XLPE thermosetting single-core and XLPE thermosetting armoured. These tables are not complete and have been added to make this book, particularly Chapter C, readable. For complete tables, please refer to BS 7671: 2008.
Appendix 2 – Popular cables: current rating tables from BS 7671: 2008 Appendix 4
2
(A)
13
27
57
1
(mm2)
1
4
16
46
22
10.5
(A)
3
Reference Method 101 (above a plasterboard ceiling covered by thermal insulation exceeding 100 mm in thickness)
63
27
13
(A)
4
Reference Method 102# (in a stud wall with thermal insulation with cable touching the inner wall surface)
42.5
17.5
8
(A)
5
Reference Method 103# (in a stud wall with thermal insulation with cable not touching the inner wall surface)
85
37
16
(A)
6
Reference Method C* (clipped direct)
57
26
11.5
(A)
7
Reference Method A* (enclosed in conduit in an insulated wall)
2.8
11
44
(mV/A/m)
8
Voltage drop (per ampere per metre)
Ambient temperature: 30°C Conductor operating temperature: 70°C
A* For full installation method refer to Table 4A2 Installation Method 2 but for Twin flat and earth cable B* For full installation method refer to Table 4A2 Installation Method 20 but for Twin flat and earth cable 100# For full installation method refer to Table 4A2 Installation Method 100 101# For full installation method refer to Table 4A2 Installation Method 101 102# For full installation method refer to Table 4A2 Installation Method 102 103# For full installation method refer to Table 4A2 Installation Method 103 Wherever practicable, a cable is to be fixed in a position such that it will not be covered with thermal insulation. Regulation 523.7, BS 5803-5: Appendix C: Avoidance of overheating of electric cables, Building Regulations Approved document B and Thermal insulation: avoiding risks, BR 262, BRE, 2001 refer.
Reference Method 100 (above a plasterboard ceiling covered by thermal insulation not exceeding 100 mm in thickness)
Conductor crosssectional area
Current-carrying capacity (A)
Samples from Table 4 D5A 70°C thermoplastic insulated and sheathed flat cable with protective conductor (copper conductors).
Table 4C5 Rating factors for groups of one or more circuits of single-core cables to be applied to reference current-carrying capacity for one circuit of single-core cables in free air – Reference Method F in Tables 4D1A to 4J4A.
2
Appendices
267
2