Where a disconnecting means is required to be lockable open as described in 110.25 of 2014 NEC, when is the provision for the locking means to remain in place not required?

A. Never.

B. When cord-and-plug connections are used

C. Only when installed as a motor disconnecting means

D. For air-conditioner disconnecting means

Answer: B

Per the Exception, when cord-and-plug connections are used as described in 110.25, the provision for the disconnecting means to be lockable open does not apply.

Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at necexpert@aol.com.