I need to wire a controller for an electric boiler.
Boiler is currently supplied via a 45amp breaker and a suitably large cable.
Controller needs a 240v supply. Instructions suggest this can come from boiler supply via a 3a fused spur.
Is it acceptable for this cable to be 2.5mm sized and a very short run of about 12inches to the spur. Or should it be equal size as the cable running to the boiler. Not sure if two cables that size would fit so the other option would be taking the power direct from the ccu and a 6amp breaker.
Technically it would not be protected if it were 2.5 coming from the boiler. I think I may have answered my own question but wanted to see what everyone else thinks
Thanks
Boiler is currently supplied via a 45amp breaker and a suitably large cable.
Controller needs a 240v supply. Instructions suggest this can come from boiler supply via a 3a fused spur.
Is it acceptable for this cable to be 2.5mm sized and a very short run of about 12inches to the spur. Or should it be equal size as the cable running to the boiler. Not sure if two cables that size would fit so the other option would be taking the power direct from the ccu and a 6amp breaker.
Technically it would not be protected if it were 2.5 coming from the boiler. I think I may have answered my own question but wanted to see what everyone else thinks
Thanks