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3) With a passive RCD one must ensure if the load is high enough to reduce the voltage to below what the RCD will operate at either that voltage is safe or some other device will trip. One would hope that voltage would be 50 volt or less it seems RCBO's to BS EN 61009 do but I know I had problems trying to use an RCD designed for 230 volt on a 55 – 0 – 55 volt supply. However one hopes that where the loop impedance satisfies the required limits then the fuse or MCB will trip where the load is high enough to reduce the voltage to below what the RCD will work at?
5) With TT there should already be a RCD. With TN if the item is correctly bonded then the fuse/MCB should be enough to protect against direct contact. I would agree a water leak could result in a fault being transmitted outside the protective cage formed by the metal casing of the washing machine.
I will agree a RCD can become faulty. But in the past I have found with a new RCD when they fail often taking the tension out of the cables will then mean they work. The casing it seems can warp and cause them to fail. However with a plug in unit the unit is in general more robust so less likely to be warped to a point where it will fail.
I don’t say don’t use a RCD but a plug in RCD starts at £5 but a RCD socket at around £15 so why spend three times over what is required? The guy says he’s short of money so it seems daft to spend 3 times the money with the only gain being it could comply with regulations but without a minor works certificate then it will not comply any way so why bother fitting a RCD socket rather than a simple plug in RCD?
5) With TT there should already be a RCD. With TN if the item is correctly bonded then the fuse/MCB should be enough to protect against direct contact. I would agree a water leak could result in a fault being transmitted outside the protective cage formed by the metal casing of the washing machine.
I will agree a RCD can become faulty. But in the past I have found with a new RCD when they fail often taking the tension out of the cables will then mean they work. The casing it seems can warp and cause them to fail. However with a plug in unit the unit is in general more robust so less likely to be warped to a point where it will fail.
I don’t say don’t use a RCD but a plug in RCD starts at £5 but a RCD socket at around £15 so why spend three times over what is required? The guy says he’s short of money so it seems daft to spend 3 times the money with the only gain being it could comply with regulations but without a minor works certificate then it will not comply any way so why bother fitting a RCD socket rather than a simple plug in RCD?