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thank you Plug !! I shall sleep better tonight ! Last question... Was planning to connect all this to a new 45A 1-way Wylex consumer unit, fit a 100A DP connection block, then get the elecy board to fix tails (25mm) from main supply to connection block, and tails from block to old and...

hmm, maybe i used the wrong term .... i meant a reinforced steel joist ... a big metal "I" shaped bar running from one end of the house to the other, holding the floor up i presume !!

.. is that bad then ? i saw the original cabling was going through it (several holes had been drilled togethert to get 6 existing cables through), but there was no room left to get my new cable through. To go over it would have put the cable right under the carpet surface, to go under would...

Okay, so i'm putting in a new circuit (single cable, not ring!) to the old WC at bottom of garden in order to power a ceramics kiln i have. 14M indoor cabling, 16m outdoor. Kiln is 3.75 KW = 16.3A So if i do a Voltage drop calc based on 2.5mm cable: 30M * 16.3A = 8.2V : Drop = 3.62%...