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Mixed IT and TN-S Earthing Systems

Roger123
Hi, 

I'm installing Dd0yn11 transformers to supply 12-pulse VSDs; these require an IT system (I think). 

I will have other panels / motors etc. in the same area supplied from a Dyn11 (solidly earthed neutral) transformer i.e. TN-S system. 

Is there anything in BS7671 that tells me I can't have 2 earthing systems in the same area?

I would be grateful of any advice / guidance.

Thanks.
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    411.3.1.1 does say ..."Simultaneously accessible exposed-conductive-parts shall be connected to the same earthing system..."


    But it sounds to me if you have control of the source of the TN-S system as well as what's conventionally the consumer's side you'd could have a "T" that's common to both the TN-S system and the -T part of the IT system.


       - Andy.
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  • 0
    411.3.1.1 does say ..."Simultaneously accessible exposed-conductive-parts shall be connected to the same earthing system..."


    But it sounds to me if you have control of the source of the TN-S system as well as what's conventionally the consumer's side you'd could have a "T" that's common to both the TN-S system and the -T part of the IT system.


       - Andy.
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