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Henley block - new 2nd consumer unit installation
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<blockquote data-quote="Ardet R" data-source="post: 464845" data-attributes="member: 30040"><p>Multiple considerations here.</p><p></p><p>Car charge points are preferred not to be fed from a PME supply and ambiguous and impractical rules are in place about this.</p><p></p><p>If you were installing a TT car charge point then you would not need the PME earth.</p><p></p><p>Obviously if you are working on the outgoing meter tails these should be dead before starting work, so the legal method is to contact the supply company and arrange for a temporary disconnection, where they will remove the DNO fuse for you.</p><p></p><p>The wiring regulations state there should be a single point of isolation for an installation so ideally an isolator would be required before the split.</p><p></p><p>Would it be easier to install an RCBO in the existing consumer unit and take this circuit out to the meter box for your charge point, divorcing the earth at an appropriate point?</p><p></p><p>I would use a double pole henley block as they are neat and allow further splits if required.</p><p></p><p>I would cut the tails (and earth if required) and then rejoin in the block ensuring there is enough slack to allow work on the internal CU.</p><p></p><p>If the tails and earth are suitably sized and undamaged there should be no need to replace them.</p></blockquote><p></p>
[QUOTE="Ardet R, post: 464845, member: 30040"] Multiple considerations here. Car charge points are preferred not to be fed from a PME supply and ambiguous and impractical rules are in place about this. If you were installing a TT car charge point then you would not need the PME earth. Obviously if you are working on the outgoing meter tails these should be dead before starting work, so the legal method is to contact the supply company and arrange for a temporary disconnection, where they will remove the DNO fuse for you. The wiring regulations state there should be a single point of isolation for an installation so ideally an isolator would be required before the split. Would it be easier to install an RCBO in the existing consumer unit and take this circuit out to the meter box for your charge point, divorcing the earth at an appropriate point? I would use a double pole henley block as they are neat and allow further splits if required. I would cut the tails (and earth if required) and then rejoin in the block ensuring there is enough slack to allow work on the internal CU. If the tails and earth are suitably sized and undamaged there should be no need to replace them. [/QUOTE]
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Henley block - new 2nd consumer unit installation
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