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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

    “If a building (a large steel frame industrial unit) has a DNO TN-C-S supply”

    Is this a single occupancy building with only one DNO supply coming into it or a multi occupancy steel frame building split into separate units with separate DNO supplies coming into each unit?

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  • 0

    “If a building (a large steel frame industrial unit) has a DNO TN-C-S supply”

    Is this a single occupancy building with only one DNO supply coming into it or a multi occupancy steel frame building split into separate units with separate DNO supplies coming into each unit?

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  • 0 in reply to Sparkingchip

    Hi,

    This is a single occupancy building with only one DNO supply going into it.

    The building has a number of external plant areas and a large carpark with lighting columns (all supplied from the building).

    The is also a lightning protection system comprising the roof construction as the air termination network, steel columns as down conductors which are bonded to earth pits. (I'm considering if the lightning protection system should be a isolated lightning protection system given the presence of ATEX zones).

    The building is located on a small industrial estate, so there are adjacent buildings. 

    Thank you for your comments.

    (N.B this is a theoretical future project)

     

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