Hi All,
I've got a problem with my shower circuit. Inside my CU there's a 30A terminal block which extends the Neutral connection from the flat T&E coming from pull cord/shower to the neutral bar inside the CU. This terminal block has burnt up and in the late stages of melting..... Before just simply changing it for a new one i've took the cover off the pull cord switch, all connections in there are tight and show no signs of overheating. I've took the front of the shower off and done the same to the connector block connections in there, all sound. Although I did notice the Earth from the T&E isn't sleeved.
Some details:
Shower rating: 8.7-9.5kW, 230-240V
I've done some ohms law (using 230V) based on the showers wattage rating and calculated the current to be between 38-41A(Ib).
Unless my maths is wrong, the terminal block is under-rated for the application. The circuit is protected by a 32A MCB, which is also under-rated, but never tripped? Now looking at the on-site guide (In should be greater or equal to Ib), which makes sense.
The supply cable into the shower looks the same as the (L)internal wiring. I suspect it to be 6mm. Now as the circuit is protected with a 32A circuit breaker, i guess this "sort of" supports my theory of it being 6mm cable (please see pic)?
My other worry (without doing external/de-rating factor calculations) first the supply cable is under-rated too.
Any thoughts?
Many Thanks
I've got a problem with my shower circuit. Inside my CU there's a 30A terminal block which extends the Neutral connection from the flat T&E coming from pull cord/shower to the neutral bar inside the CU. This terminal block has burnt up and in the late stages of melting..... Before just simply changing it for a new one i've took the cover off the pull cord switch, all connections in there are tight and show no signs of overheating. I've took the front of the shower off and done the same to the connector block connections in there, all sound. Although I did notice the Earth from the T&E isn't sleeved.
Some details:
Shower rating: 8.7-9.5kW, 230-240V
I've done some ohms law (using 230V) based on the showers wattage rating and calculated the current to be between 38-41A(Ib).
Unless my maths is wrong, the terminal block is under-rated for the application. The circuit is protected by a 32A MCB, which is also under-rated, but never tripped? Now looking at the on-site guide (In should be greater or equal to Ib), which makes sense.
The supply cable into the shower looks the same as the (L)internal wiring. I suspect it to be 6mm. Now as the circuit is protected with a 32A circuit breaker, i guess this "sort of" supports my theory of it being 6mm cable (please see pic)?
My other worry (without doing external/de-rating factor calculations) first the supply cable is under-rated too.
Any thoughts?
Many Thanks