Substation Fence Grounding
Substation Fence Grounding
(OP)
Is there ever an occasion to NOT ground a substation fence? If we do not, are we in violation of codes/standards?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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Substation Fence Grounding
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RE: Substation Fence Grounding
The fence is one of the most critical aspects of substation grounding because it is the equipment most likely to be contacted by the general public.
RE: Substation Fence Grounding
RE: Substation Fence Grounding
Where the fence is encompassed by the main grounding system or within 2m, it is connected to the main grounding system. If the calculated touch potential exceeds the limit in the standard, we would install a bare grounding conductor 1m outside the fence at 0.5m depth.
If an independently grounded fence abuts a substation grounded fence then an insulated panel at least 2m long has to be put in. This can be metal, but is insulated at either end with at least a 5cm gap so it "floats" electrically.
Regards
Marmite
RE: Substation Fence Grounding
RE: Substation Fence Grounding
See thread238-192760: Fence grouding at a generating facility for a discussion of coated fences.
RE: Substation Fence Grounding
Coatings can become damaged, and NESC requires grounding of any metallic fence. Perhaps there is a non-metallic fence that would suit.
RE: Substation Fence Grounding