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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?
That sounds like an extremely high estimate of the cost of installing a new cooker circuit.
However it’s not actually the kitchen fitters fault or problem, it is more than reasonable for the kitchen fitter to say no leaving you arrange for a new connection to be provided for the appliance.
As of yet you have not actually said what size the shower cable is, it could easily be 6.0 mm twin and earth with a 8.5 kW shower connected to it.
So actually loading the cable with 40 amps could easily overload it and potentially the cable insulation could fail.
It is quite permissible to have a shower that cannot possibly overload a cable protected by a circuit protective device that is rated at more than the design current of the cable.
Just because it has a 40 amp MCB protecting the cable doesn’t mean that you can rely on the circuit breaker to stop the cable from melting, particularly with over sixty amps on it.
Get a new circuit installed or installed a changeover switch at the load end.
That sounds like an extremely high estimate of the cost of installing a new cooker circuit.
However it’s not actually the kitchen fitters fault or problem, it is more than reasonable for the kitchen fitter to say no leaving you arrange for a new connection to be provided for the appliance.
As of yet you have not actually said what size the shower cable is, it could easily be 6.0 mm twin and earth with a 8.5 kW shower connected to it.
So actually loading the cable with 40 amps could easily overload it and potentially the cable insulation could fail.
It is quite permissible to have a shower that cannot possibly overload a cable protected by a circuit protective device that is rated at more than the design current of the cable.
Just because it has a 40 amp MCB protecting the cable doesn’t mean that you can rely on the circuit breaker to stop the cable from melting, particularly with over sixty amps on it.
Get a new circuit installed or installed a changeover switch at the load end.
