- Special formulas for grouping factor calculation
In some cases the conductor sizes where
cables are grouped and determined by the methods shown in
can be reduced by applying some rather complex formulas
given in [Appendix 4].
Whilst it is true that in many cases the
use of these formulas will show the installer that it is
safe for him to use a smaller cable than he would have needed
by simple application of correction factors, this is by
no means always the case. There are many cases where their
application will make no difference at all. Since this book
is for the electrician, rather than for the designer, the
rather complicated mathematics will be omitted.