Ask The Trades - A 3ph Problem

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Ask The Trades › DIY Forum › Electrical Questions › A 3ph Problem

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A 3ph Problem (Read 2534 times)

get_it_done

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A 3ph Problem
Mar 1^st, 2015, 8:20pm

OK here is the situation. The premises - A Hairdresser shop.

3P supply to shop. Split L1 - Dist board for Shop, L2 - Dist Board for Annex (Supplied by 3 core 10mm SWA), L3 - Sunbed room next to annex (1P 63A) (Supplied by 3-core 10mm SWA).

The owner requires a second sunbed and the fitting co need 3P supply in Annex and wish the original sunbed converted back to 3P. Both beds to supplied with 25A type C MCB and 63A RCD. That's the easy bit.

Question - Instead of laying a new 5core cable is there anything wrong with using the existing two 3 Core to provide the 3P supply. Assuming the calcs where correct and everything was correctly labelled. A bit unorthodox but does it comply? All comments suggestions welcome.

And welcome back

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Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8814 Total Thanks: 109 For This Post: 1 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: A 3ph Problem Reply #1 - Mar 1^st, 2015, 8:35pm If you mean use the three core as 3phases and no neutral (if the beds don't require one), then yes. However, I would say a neutral would be required. If so, all lives and neutral need to be contained in the same armoured cable as the armour is magnetic. You cannot put the phases down one cable and the neutral down another.
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get_it_done GDPR opt-out Total Thanks: 109 For This Post: 1	Re: A 3ph Problem Reply #2 - Mar 1^st, 2015, 9:35pm I knew it would not be that easy. Yup a neutral is required. I did look up the big green book and Reg 521.5.1 explains it all. Back to plan A
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get_it_done GDPR opt-out Total Thanks: 109 For This Post: 1	Re: A 3ph Problem Reply #3 - Mar 2^nd, 2015, 1:04pm Is there any sparky available in the Slough area to do a bit of 3p work ASAP?
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