Good evening all. Quick question if anyone can help.? We rent our home and have an 8.5kw shower in and would like to replace with 10.5kw. Understand the spur needs to be 10mm wiring with a 40amp fuse at the consumer unit apparently. Can anyone ID this wiring that I've attached please? I was unsure if it's 10mm overall....or if I should be expecting a solid 10mm core of copper inner..? Many thanks Phil
....and then call in a sparks to do the job properly... and get him to check the plumbing as well regarding full bore isolator... RS
Just thought I'd mention it but not applicable in this case since the cable is obviously fairly new (being blue in colour), but "old" 6mm cable also has stranded earth (as it is in my house).
Did it start out as a cooker circuit but has been altered to supply a shower? Lot's of the old cooker circuits from that period (and later) were wired in that cable. Nice cable as was the old 7/029 used for ring finals etc.
If you were to look at the rating plate, very often if gives rated current at two voltages, possibly 230 V and 240 V and if you multiply each by its respective current, generally only the higher voltage achieves rated kW.
Still exceeds 40A though. And at the OP Taking it to be 10.5 kW at 240v the current will be 44 A. Assuming the heating element is purely resistive and remains constant then it will be 5.4857 Ohms. At 230 V that will give 9.65 kW and 42 A consumption which still exceeds the 40A. However, knowing that the UK still provides a lot of the network at 240V the higher figure needs to be considered.
Don't know where my last comment went ... This shows that it will not be a simple change of shower and that wiring and/or CU changes will also be required. You will now be in a better position to discuss this with your landlord and electrician.
Hmmmmm interesting You measure pd and it reads 240v However Uo is always 230v, and is always used in calcs - aye nominal voltage This is not to be confused with u I rest my case