Why must the enclosure of explosion-proof motors be grounded, and why are some that are not grounded not required to have corrective actions taken?

Enclosure grounding is a type of protective grounding that must be implemented; it applies not only to explosion-proof motors. If no action is required for correction, it’s likely that the inspection didn’t pay enough attention to this aspect.

Grounding is required for all of them. Reasons for not proposing corrective actions: 1. It may have been overlooked; negligence. 2. Although not grounded separately, the equipment foundation is connected to the grounding bus. 3. The motor is located in different positions.

The casing grounding is protective grounding; it must be connected in all cases

1. The grounding of the motor casing has nothing to do with whether it is explosion-proof; it serves to prevent short circuits and electric leakage. I have indeed seen this in the field – touching the motor’s casing gave a feeling of electricity. 2. Why haven’t some cases that are not grounded been subject to corrective actions? ——This is a matter related to enterprise management; to be honest, the probability of motor leakage is extremely low, so it isn’t given much attention, and our company is no exception. 3. It depends on the awareness of the employees and corporate leaders. Ground-level defects might go unnoticed for a long time, but once someone brings them to attention, corrective actions must be taken. However, the speed at which these actions are carried out is far from what’s required immediately – there’s need to submit plans, wait for approval, obtain the necessary materials, and wait for the construction team to arrive……

Both explosion-proof grounding and motor operation grounding are necessary; failing to provide such grounding is a violation of regulations. Grounding of explosion-proof motors is intended to eliminate current discharge phenomena caused by electromagnetic induction.

The grounding of the motor housing has nothing to do with explosion protection; it is a protective grounding measure to prevent leakage current from the housing.

Motors use three-phase electricity and all require protective grounding.

All industrial electrical equipment needs to be grounded, right?

It needs to be grounded; surely the person who checked didn’t look carefully. Those conducting the inspection generally focus on the safety control of your key process equipment

The anchor bolts of the motor are generally buried underground; does this count as grounding?