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Thru-Door Disconnect

Thru-Door Disconnect

Thru-Door Disconnect

(OP)
On Industrial control enclosures (PLC-type enclosures) IF the power supply to the enclosure is 120VAC (or below) single phase, IS THRU-DOOR INTERLOCK REQUIRED?  Commonly door-interlocked breakers are only available in 3-pole configuration.

RE: Thru-Door Disconnect

It depend is it is a standalone box or part of machinery.  If it's by itself then...

60.2 An industrial control panel provided with a separately supplied control circuit where the
disconnecting means and/or branch circuit protection is omitted shall be marked to indicate that these
devices shall be provided by the installer.

If it's part of machineery then I don't think so.  I've seen 120vac boxes with disconnects where they only used 2 of the three poles.

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