Why does the circuit breaker knock after replacing the fan in the bathroom?
Hello! There was an exhaust fan in the bathroom without a timer, connected through a light switch. We decided to set it with a timer to turn off some time after turning off the light. There are three terminals. I took zero and phase those that connected to a simple fan and extended one phase wire from the machine to the washing machine. Cut down the machine. Is there any difference from which machine to pull the phase? Do you need to take zero either different or the one from the old fan?
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Hello! It does not matter where to get the zero or phase. Knocks out constantly or only when the washing machine is on? It’s not entirely clear, where does the washing machine go to the fan? Have you been powered from this line? If yes, then I advise you to check the fan separately by supplying power to it, for example, from an outlet from another machine. So you eliminate the problems with the wires, and if knocked out again - most likely the matter is in the fan.
If you connected the phase from the washer to the third terminal, then you are clearly making a short circuit, the third terminal is needed for grounding. If we have not fully answered your question, send details based on our answer.
Hello! According to the connection diagram of the fan with a humidity sensor and a timer, you need to pull a separate additional phase, so I have three terminals (L, LT, N). I took this separate phase from the machine to the washing machine, it was just more convenient to pull the wire from there. I connected a separate phase to terminal L. On LT, I connected the terminal from the light switch and to N zero. In this case, the third terminal is not for grounding. The fan works without a timer and light sensor if you do not connect an additional phase. But everything seems to be correct according to the scheme. I don’t understand what the problem is
Do you have single phase input? If three-phase, then the machine and the light there are sitting on the same phase or on different? This is one of the options for the problem. You did not answer, did you check from a single phase, from an outlet, for example? According to the standard scheme, the phase is taken from the wire BEFORE the switch. And does the thermal release or electromagnetic trip? (instantly or through time?)