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Thanks RF & securespark also, the consumer fuse has 100 amps written on it (as well as Series 5 type 11b, 415 volt) I take the point about the multi wire having the smaller area, obvious when you think about it.... Looks like TN-C-S, the earth wire goes to an open block right next to the...

hi cozycats, Thanks for the response Yep, incoming tail to the meter is 6.5mm on the outside of the primary insulation, (the red plastic), if the insulation is 1mm thick then the wire is 4.5mm diameter, I make that 15.9sq mm.area cross section It's a 100amp consumer fuse, and a 60 amp fuse...

Hello All, I've looked at the faq, but still not sure, apologies in advance then if this is well covered I'm hoping to get an electric shower in over the bath, and would like to know what it's going to take, (apart from water,10mm2 cable,supplementary bonding, 50 amp pull-switch,and rcd csu )...