Issue of secondary grounding of the motor enclosure
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In accordance with relevant regulatory requirements, we stipulate that all motors in the hazardous chemicals workshop must be grounded a second time on-site. However, the director of the electrical and instrumentation workshop said that this is not necessary, as there is already grounding in the power distribution room (within the motor terminals). We would appreciate it if experts could share their views on this matter for our learning!
The enclosures of all equipment in the hazardous chemicals workshop must be grounded to prevent accidents caused by static electricity
The motor’s casing is grounded as an anti-static bonding and equipotential connection.
It should be grounded, although there is grounding in the power distribution room.
Grounding the enclosure constitutes repeated grounding, which is more effective in preventing electric shock accidents
They are asking about which specific standard it is, not whatever you say
We have encountered this situation as well; the evaluation experts require that motors be grounded separately, especially larger ones, and grounding protection must be provided on the motor’s casing.
Yes, it’s necessary to ensure grounding; there are standards for this, such as the \"Electrostatic Grounding Regulations\".
It mainly depends on what type of power supply system is used; in TN-S and TN-C-S systems, the motor enclosure must be grounded, and its primary function is to provide protective grounding to prevent electric shock accidents. The power supply systems in general hazardous chemicals manufacturing enterprises are TN-S or TN-C-S systems.