In the hotel's three-phase four-wire power supply system, the voltage of each phase is 1 10 measured with a pencil. When the fluorescent lamp flashes and the motor vibrates, it is normal to close the

In the hotel's three-phase four-wire power supply system, the voltage of each phase is 1 10 measured with a pencil. When the fluorescent lamp flashes and the motor vibrates, it is normal to close the main brake and then open it. It may be a different phase of the switch. Touch the switch by hand after a period of time. If it is hot, replace it. Lack of phase is easy to burn out the motor. Look at what you wrote, it seems that all your motors have no open-phase protection.

The voltage is 1 10V. You must have measured it with an induction pen. Sometimes it misleads you. It is better to have a multimeter.