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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 Mike Mln
    Mike Mln said:
    It has a bit more detail than 60079-14.

    Agreed ... but even there, there's still a need to understand that physical separation is needed between the earth electrode, protective conductors and exposed-conductive-parts in REF C and REF E supplies, from exposed-conductive-parts and buried metalwork connected to the primary supply ... both to conform to BS 7671 Regulation 411.3.1.1, and to prevent transfer of voltages and currents below ground. The worst-case transfer of voltage we are looking for is not 70 V AC, as in EV charging installations, but 25 V AC.

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