Basic Electrical Installation Work

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0 8.6 2.9 4 16.9 10 35. The provision spare space advisable; however, any circuits added later date must take into account grouping.Electrical installations and wiring systems 315 Table 14.9 11. Adapted from the IEE Site Guide by Kind Permission the Institution Electrical Engineers Factors for trunking Dimensions trunking (mm mm) Factor Dimensions trunking (mm mm) Factor 50 767 200 100 8572 50 1037 200 150 13001 75 738 200 200 17429 75 1146 225 3474 75 1555 225 4671 75 2371 225 7167 100 993 225 100 9662 100 1542 225 150 14652 100 2091 225 200 19643 100 3189 225 225 22138 100 100 4252 300 4648 150 2999 300 6251 150 3091 300 9590 150 4743 300 100 12929 150 100 6394 300 150 19607 150 150 9697 300 200 26285 200 3082 300 225 29624 200 4145 300 300 39428 200 6359 Space factor 45% with trunking thickness taken into account.5 8.6 13.4 Notes: These factors are for metal trunking and may optimistic for plastic trunking where the cross-sectional area available may signiﬁcantly reduced from the nominal by the thickness the wall material. .1 6 21.5 11. Appendix 7671.5 8.8 Trunking Cable Factors.3 25 73.8 50. Table 14.2 22. Adapted from the IEE Site Guide by Kind Permission the Institution Electrical Engineers Cable factors for trunking Type of conductor Conductor cross- sectional area (mm2 ) PVC 6004 Cable factor Thermosetting BS 7211 Cable factor Solid 1.9 75.9 Stranded 1.3 16 47.5 12.6 18.9 Trunking Cable Factors.6 9.3 36.6 2