430.74

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Switching the neutral is an easily seen oops,,,,,ie: if the (now neutral) switchleg were to shake loose and go to ground at the switch, the motor could start.

These kinds of things do happen no matter how bazzare.

dick
 
xformer said:
Can anyone give me a few examples of control circuits that do not meet 430.74?
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A remote start switch wired between the starter's contactor coil and grounded control conductor. A ground fault in the wire between switch and coil could start the motor.

All start control switches should be in the non-grounded conductor side of the coil. Manufacturers commonly put overload switches in the grounded side, but that is in the controller, and not under NEC purview.
 
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