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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?
No it is not what you say, it is the fact that this is perfectly permitted, and as I commented the same as any domestic power final circuit where one has no idea what loads may be presented. The customer has told you the conditions of use which are clear and the chance of a trip very small. No problem. The problem is the attitude which you present, "I know this is not ideal so I will prevent it without any valid reason". That is the problem which you do not see. If you examined many other installations you would know that this kind of circuit is common (not domestic I grant you) and is not in any way risky or anything else. The question is as I first posed, what is wrong with it? The regulations answer "nothing". So why the fuss. You say I besmirch the integrity of professional electricians, well if you are wrong that is your problem, you are wrong!!! I would happily wire another 100kW motor in parallel with the one I discussed, but if you try to use it you will trip the CPD. Your problem. Obviously I would not do so if they are both required together, but that is up to the user to define as in the OP. As long as my OPD was set correctly the design is perfectly fine.
No it is not what you say, it is the fact that this is perfectly permitted, and as I commented the same as any domestic power final circuit where one has no idea what loads may be presented. The customer has told you the conditions of use which are clear and the chance of a trip very small. No problem. The problem is the attitude which you present, "I know this is not ideal so I will prevent it without any valid reason". That is the problem which you do not see. If you examined many other installations you would know that this kind of circuit is common (not domestic I grant you) and is not in any way risky or anything else. The question is as I first posed, what is wrong with it? The regulations answer "nothing". So why the fuss. You say I besmirch the integrity of professional electricians, well if you are wrong that is your problem, you are wrong!!! I would happily wire another 100kW motor in parallel with the one I discussed, but if you try to use it you will trip the CPD. Your problem. Obviously I would not do so if they are both required together, but that is up to the user to define as in the OP. As long as my OPD was set correctly the design is perfectly fine.
