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Can someone advise us please? We have to replace our worn out existing shower which is 8kw. Can we put in a 8.5 kw with the existing rating which is 32amp fuse?
securespark said:6mm2 T & E is rated at 46A in the regs, clipped direct. Assuming there are no correction factors like ambient temperature a rewireable fuse (BS3036) or cable runs in loft insulation, 6mm2 is adequate up to 10.8 kW (45A).
Got to watch for voltage drop, but that aint a problem in 99% of cases, cos you have a max of 4% voltage drop on 240 V (ie 9.6V) and you'd have to have a circuit length of well in excess of 25m to achieve that figure loss.
securespark said:sterose
"If a certain method of wiring is dodgy.....do it properly."
Resent this comment. My methods are not dodgy. I have been doing this job professionally for 16 years and never had any problems or comeback etc with any of my work.
Sure, you can go ott on cable sizes, but if you don't have to, why do it?
In some installations, replacing the cable would present many practical problems. It's not just about the cost of a few metres of 10mm2 T & E.
The figures in the regs are worked out to be safe, even if the cable is working at its limit. As long as the other requirements are dealt with correctly ie upgraded MCB , an RCD, making sure the CU isolator is 100A and possibly the main fuse as well, as well as the obvious main and supplementary earth bonding, then the job is a good one.
securespark said:You should even consider linking to earth wires feeding shaver sockets, light fittings etc.
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