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Two high-power appliances on a single 40A RCD
Former Community Member
I have an electric shower installed on a 40A RCD, in a room adjacent to my kitchen. The shower is only used in an emergency - i.e. when our gas boiler is unable to provide hot water to our main bathroom. I would like to take a spur from this 40A connection to use for a new double oven, which is rated at 32A. Can anyone advise on a safe and legal way to do this, ensuring that only one of the two appliances can be connected at any one time?
I think there's a big difference between e.g. an under-specced 16A kitchen circuit tripping every other day because whenever you turn on more than one or two of kettle, washing machine, toaster etc it exceeds the design current; and a shower+cooker circuit tripping once per year.
If we are to follow the literal letter of the "law", then we shouldn't install both a cooker and a shower in the same house which is protected by only a 60A cut-out fuse. We should become po-faced and tell the customer that they must contact the DNO to get their supply upgraded to 80A plus before we install the shower.
I think there's a big difference between e.g. an under-specced 16A kitchen circuit tripping every other day because whenever you turn on more than one or two of kettle, washing machine, toaster etc it exceeds the design current; and a shower+cooker circuit tripping once per year.
If we are to follow the literal letter of the "law", then we shouldn't install both a cooker and a shower in the same house which is protected by only a 60A cut-out fuse. We should become po-faced and tell the customer that they must contact the DNO to get their supply upgraded to 80A plus before we install the shower.
