dmulhol925
Member
Is it required to ground a hinged control panel door with electical devices installed on door.
Control Panel Door
- Thread starter dmulhol925
- Start date
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petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
If it is a UL508a listed panel, yes.
66.3.4 An internal bonding conductor shall be provided between a metal cover or a door on which
electrical components are mounted, and the enclosure or the equipment grounding terminal. The bonding
conductor shall have an ampacity not less than the largest circuit conductor used to connect the cover or
door-mounted components.
Exception: When all electrical components mounted to a metal cover or door are connected to a control
circuit rated 30V rms or less the bonding conductor is not required.
I am not entirely convinced it always has to be bonded with a wire though. The old style continuous hinge doors were listed as bonded by the hinge pins IIRC.
The new style boxes do not appear to be very well bonded thru the hinges.
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