The circuit breaker of the lighting system has tripped; help needed
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Hello everyone. There are around 40 lights in the on-site lighting system, each with a power rating of 36W. These lights are divided into two circuits: one circuit has 23 lights, and the other has around 17 lights. After all the lights were turned on for about 10 minutes, the main circuit breaker on the control panel (a Schneider 32A breaker) tripped. When measured with a meter, the current entering the main switch was only around 15A. What could be the reason for this? Please explain
With 40 lights of 36W each, the total power is just over 1 kilowatt, and the current does not exceed 10A. The main circuit breaker (32A) is far larger than the current in use, yet it still trips. In my opinion, possible reasons for this include a short circuit in the wiring, other electrical devices connected to that circuit, or poor performance of the main circuit breaker. The test current is 15A, indicating that there are other electrical devices on the circuit.
Personally, I think there are no other issues; just replacing the circuit breaker will do. Due to different usage environments, the items inside the riot control operation box have become vulnerable components.
I personally also think it’s a quality issue with the circuit breaker. As you said: there is a short circuit in the circuit; under such conditions the breaker should trip quickly. It took over 10 minutes at the scene before the breaker tripped
Well, I’ll check on the spot and try using a different circuit breaker
Not yet; I’ve been busy with other things on site these past few days
Current circuit breakers are quite mature, but I think the possibility of leakage current is still high; it is recommended to use a megohmmeter to measure the insulation resistance first