220V interference
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Hello everyone. In our facility, there is an old cable connected to a small compressor. There are 4 220VAC LED alarm lights on site; a 30-core control cable is used for these lights, with 2 wires per light, and the remaining wires are not connected. There are also switch signals in the wiring box, which are also at 220V. Currently, the lights turn on on their own even though there is no power supply; a multimeter showed a voltage of over 60 volts, which is likely interference. How should this issue be resolved?
Electrostatic interference is difficult to resolve without shielding.
Add some resistors to the bright light strings. Keep them from lighting up at 60V. If it can be powered on with 220V, then that’s fine.
Try reversing the live and neutral wires; use the shielding layer on the wire – as a simple solution, you can try using aluminum foil for grounding
Try twisting all the spare cores together into a single end-grounded wire.
Agree to connect a resistor or (connect a capacitor between the negative terminal and ground)
That’s a good idea. I’m not sure if using series resistors is safe, or if it might cause a fire or something.
Now it’s all UPS power; both ends are at 110V with respect to ground, and there are no live and neutral wires anymore. I haven’t tried the shielding layer yet
The leaders tried it earlier, but it didn’t work.
Try using a series resistor next time to see if it works; what value is generally suitable?