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DNO TN-C-S supply to an industrial unit building which contains ATEX zones

Patrick Benson

Hi,

Could anyone offer any advice in relation to the earthing arrangement within ATEX zones please?

If a building (a large steel frame industrial unit) has a DNO TN-C-S supply, could it be acceptable for this earthing arrangement to enter ATEX zones? I'm considering a PEN conductor fault potentially representing an issue which should be avoided.

Is it reasonable to expect the ATEX zones required earthing arrangement to be defined in the project Hazardous Area Classification and DSEAR Risk Assessment and or project performance specification?

I appreciate BS EN 60079-14 may provide appropriate recommendations, which I intend to review a.s.a.p.

(Apologies if the above outline is too brief).

Thank you in advance for any responses.

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  • 0 in reply to Sparkingchip

    Unfortunately, 'SNE' is not a defined term in BS 7671, and neither BS 7671 nor IEC 60364 series internationally recognize 'TN-S derived from TN-C-S'

    However, the label correctly advises to treat the installation as PME (TN-C-S) for the purposes of BS 7671.

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