This British Standard gives recommendations for the distribution of
electricity on construction and demolition sites, and gives guidance
on the application of the requirements of BS 7671 on such sites. It
is intended for use by builders, contractors, engineers and others
concerned with the provision of electrical installation equipment
suitable for individual site conditions.
This British Standard is limited to those supply systems operating
at nominal voltages not exceeding 440 V a.c. between conductors,
or 250 V a.c. between conductors and earth.
The following are outside the scope of this British Standard:
a) high voltage incoming supplies and equipment;
NOTE 1 For some site installations, supplies at a higher voltage,
e.g. 11 kV a.c. and 33 kV a.c., are used.
b) underground mining operations;
c) current-using equipment;
d) output circuits of frequency changers.