Table 4.4 - Correction factors for groups of cables
Number of circuits
Correction factor Cg
-
Enclosed or clipped
Clipped to non-metallic surface
-
-
Touching
Spaced*
2
0.80
0.85
0.94
3
0.70
0.79
0.90
4
0.65
0.75
0.90
5
0.60
0.73
0.90
6
0.57
0.72
0.90
7
0.54
0.72
0.90
8
0.52
0.71
0.90
9
0.50
0.70
0.90
10
0.48
----------
0.90
* ‘Spaced’ means a gap between cables at least equal to cable diameter.

Extracted from The Electricians Guide Fifth Edition
by John Whitfield

Published by EPA Press
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