Keor MOD
Installation and maintenance manual
23
4.2.3 Earthing connection
Before carrying out any other installation operation, connect the earthing wiring coming from the low voltage switchgear
to one of the earthing bars located on the left and right side of the busbars connection system.
The minimum cross-sectional area of the earthing conductor must be chosen according to the following criteria:
• if the cross-sectional area S of the phase conductors is S ≤ 16 mm
2
, the minimum cross-sectional area of the earthing
conductor must be the same as the phase conductors;
• if the cross-sectional area S of the phase conductors is 16 mm
2
< S ≤ 35 mm
2
, the minimum cross-sectional area of the
earthing conductor must be16 mm
2
;
• if the cross-sectional area S of the phase conductors is S > 35 mm
2
, the minimum cross-sectional area of the earthing
conductor must be S/2 mm
2
.
Each earthing cable must be crimped with M8 eyelets and fixed to the earthing metal bar using hex M8x20 screws along
with M8 flat washers and M8 grower washer.
The grower washer must be put on the top of the flat washer.
KEOR MOD 125 – earthing bars
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