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Is the following statement true or false? Every motor must have a disconnect, and that disconnect must be installed within sight of the motor.
The statement may sound right, but technically it’s false. The disconnect for the motor controller can serve as the disconnect for the motor [430.102(A) and (C)]. The logic here is that if the controller has a disconnect, it’s effectively disconnecting the motor anyhow so you don’t need a second disconnect at the motor. But the controller has to be within sight of the motor or you’ll need another disconnect for the motor.
Also, there are two conditions for which a disconnect isn’t required.
So if you don’t have a disconnect, how do you isolate the motor for servicing? You do a lockout/tagout on the branch circuit breaker (or fuses).
That covers the main points of the first one-eighth of Article 430, Part IX. The rest of Part IX provides requirements for the disconnect itself; many depend upon the application. In our next issue we’ll start with the disconnect operation requirements.