Cord and Plug?

[Strahan]

Guys We are currently going through our plant and addressing equipment that currently does not have a disconnect. Alot of our 3phase motors are connected by cord and plug without a disconnect switch. I believe this is accepted by the NEC, but I can't find it. In my opinion I still want to put disconnect switches on these motors with a feedback signal from the disconnect so we can program this signal in our PLC's. The signal would cut off control of the motor so when someone turns the disconnect back on the motor does not start unexpectantly. By having these motors on cord and plug it is possible for someone to plug these in hot and with our wet atmosphere this is not good. Any thoughts maybe I'm wrong with cord and plug being ok not sure

 

[iwire]

IX. Disconnecting Means

430.109 Type. The disconnecting means shall be a type specified in 430.109(A), unless otherwise permitted in 430.109(B) through (G), under the conditions specified.

(F) Cord-and-Plug-Connected Motors. For a cord-and-plug- connected motor, a horsepower-rated attachment plug and receptacle having ratings no less than the motor ratings shall be permitted to serve as the disconnecting means. A horsepower-rated attachment plug and receptacle shall not be required for a cord-and-plug-connected appliance in accordance with 422.33, a room air conditioner in accordance with 440.63, or a portable motor rated 1⁄3 hp or less.

You can actually get plugs and connectors with auxiliary switches to provide the feed back you are looking for.

I know I have installed some in hazardous locations, I am not sure if they come in less expensive types.

 

[chris kennedy]

See 430.109(F).

Bobs had more coffee than me.