Page 35 - Pocket Guides
P. 35
PG 19
PG 1-2
SIZING EARTHING CONDUCTORS
Additionally, an earthing conductor buried in the ground must have a csa not less
than that given in Table 54.1 of BS 7671 (reproduced below for ease of reference).
MINIMUM CROSS-SECTIONAL AREA OF A BURIED EARTHING CONDUCTOR
Protected against Not protected against
mechanical damage mechanical damage
2
2
2.5 mm copper 16 mm copper
Protection against corrosion by sheath
2
2
10 mm steel 16 mm coated steel
2
25 mm copper
Not protected against corrosion
2
50 mm steel
The thickness of a tape or strip conductor must be suitable to withstand mechanical
damage and corrosion. BS 7430 – Code of practice for protective earthing of
electrical installations recommends that unprotected strip conductors are not less
than 3 mm thick (clause 9.7 refers).
EARTHING CONDUCTOR PROTECTED AGAINST CORROSION
SAFETY ELECTRICAL
CONNECTION SAFETY ELECTRICAL
DO NOT REMOVE Earthing conductor CONNECTION
DO NOT REMOVE
Non-metallic
conduit or duct
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