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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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    Are we saying that there is a distinction to be made between “system earthing”, “earthing system” and earthing arrangement? None of the terms are defined in 7671but the first and the last appear to be the same in that the former is  used in the first paragraph of 411.3.1.1 which refers to 411.4 to 411.6 all of which are earthing arrangements described as such in the Electrical Installation Certificate or Condition Report in Appendix 6. 

    To make a distinction between “system earthing” and “earthing system” without a clear definition would be errant. May I respectfully suggest that the second paragraph of 411.3.1.1 should find a form of words that would better reflect the intention.
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  • 0
    Are we saying that there is a distinction to be made between “system earthing”, “earthing system” and earthing arrangement? None of the terms are defined in 7671but the first and the last appear to be the same in that the former is  used in the first paragraph of 411.3.1.1 which refers to 411.4 to 411.6 all of which are earthing arrangements described as such in the Electrical Installation Certificate or Condition Report in Appendix 6. 

    To make a distinction between “system earthing” and “earthing system” without a clear definition would be errant. May I respectfully suggest that the second paragraph of 411.3.1.1 should find a form of words that would better reflect the intention.
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