Strange things
Thread Content
Today, Schenk from the company said that the control power supply suddenly lost power. Upon on-site inspection, it was found that both the live wire and the neutral wire of the control power supply’s contactor were carrying electricity. A voltage measurement was taken using a multimeter on the live wire and neutral wire at the terminal block, but this caused the circuit to trip. Why does tripping occur when measuring voltage with the voltage range setting? I can guarantee there is no short circuit, as the live wire and the neutral wire are separated by several terminals. Later, after closing the circuit breaker, the power supply returned to normal. What’s going on here? Please help explain
Since both the live wire and the neutral wire are charged, it indicates that the grounding of the neutral wire is poor, or the grounding of the panel/cabinet is inadequate; the tripping that occurs when measuring voltage is purely coincidental.