Distribution Boards?

Can someone explain why MCB feeding circuits in a harzardous area is fitted with double pole i.e. L & N. Is there a standard that requires this and if yes what standard is that?

I will be glad is someone can give a detail explanation.

Many thanks.

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  • 1 decade ago
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    Yes it is a standard for hazardous areas. ( it is an American standard but I can not remember the number of the standard)

    In hazardous areas either you use L+N MCB's or use DC power if possible because of safety reasons.Mostly in these areas we use special cable ( steel shielded cables ) and special fixtures and socket outlets. ( EX proof , that means explosion proof).In NATO bases you pull the cables in steel conduits also.

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