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Do-It-Yourself (DIY) Question & Answer Forum
Two supplies to a building
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<blockquote data-quote="kme" data-source="post: 186996" data-attributes="member: 113"><p>So you`ve effectively got a TPN "summation" supply.</p><p></p><p>You cannot, IMO, issue seperate certs, unless you are prepared to class the kitchen as its own installation, i.e. a seperate entity from the rest of the building. If that is the case, then I don`t foresee a serious issue, bearing in mind the comments you`ve made above.</p><p></p><p>However, if you want to share the whole building between the two supplies (you did say the 400A supply was on limits..?), then the issue gets a little more confusing. However, the prime issue for you is that you cound NOT issue seperate EICs for each supply, when they serve a common premises. You`d have to fill the cert., as Albert said, with the "worst case" figures, and explanation of the supply system.</p><p></p><p>The best solution, IMO, to the earthing problem, is if DNO will tie the PEN conductors "at the HEDs". That would give you one earthing conductor. The other option is to request a non-PME supply, explaining your concerns. Most DNOs will be open to your comments, some will even provide advice.</p><p></p><p>HTH</p><p></p><p>KME</p></blockquote><p></p>
[QUOTE="kme, post: 186996, member: 113"] So you`ve effectively got a TPN "summation" supply. You cannot, IMO, issue seperate certs, unless you are prepared to class the kitchen as its own installation, i.e. a seperate entity from the rest of the building. If that is the case, then I don`t foresee a serious issue, bearing in mind the comments you`ve made above. However, if you want to share the whole building between the two supplies (you did say the 400A supply was on limits..?), then the issue gets a little more confusing. However, the prime issue for you is that you cound NOT issue seperate EICs for each supply, when they serve a common premises. You`d have to fill the cert., as Albert said, with the "worst case" figures, and explanation of the supply system. The best solution, IMO, to the earthing problem, is if DNO will tie the PEN conductors "at the HEDs". That would give you one earthing conductor. The other option is to request a non-PME supply, explaining your concerns. Most DNOs will be open to your comments, some will even provide advice. HTH KME [/QUOTE]
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