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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?
None of you have yet found a regulation number which is in opposition to my suggestion. BOD is being BAD because he doesn't have one either. However I will continue the discussion. Say I have a large motor circuit say 100 kW which is designed to start a few times per hour. I use a type D (MCCB but this is to help you) CPD. Do the cables need to be rated at 6 times the running current? If so which regulation are you quoting? Just some background this motor may take a minute (60 seconds) to reach FLC due to the load inertia. What size cables should I use? How do I control the number of starts per hour? How is this different to the example I gave or the OP?
And this may be a valuable training exercise. I will discuss further tomorrow.
None of you have yet found a regulation number which is in opposition to my suggestion. BOD is being BAD because he doesn't have one either. However I will continue the discussion. Say I have a large motor circuit say 100 kW which is designed to start a few times per hour. I use a type D (MCCB but this is to help you) CPD. Do the cables need to be rated at 6 times the running current? If so which regulation are you quoting? Just some background this motor may take a minute (60 seconds) to reach FLC due to the load inertia. What size cables should I use? How do I control the number of starts per hour? How is this different to the example I gave or the OP?
And this may be a valuable training exercise. I will discuss further tomorrow.
