Modular laboratory furniture (a work station bench) is furnished with integral 120-volt duplex receptacles and task lights that are prewired to a cord and plug. The plug connects to a NEMA L14-20 125/250V twist-lock receptacle mounted in the ceiling. Does the NEC require a 2-pole circuit breaker to feed the twist-lock receptacle or can two 1-pole circuit breakers with a handle tie be used?
Cord & Plug Connected Laboratory Furniture
- Thread starter jyoung2
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- Massachusetts
That is a multiwire branch circuit and the NEC requires at least handle ties on the disconnecting means.
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- Lockport, IL
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- Semi-Retired Electrical Engineer
I agree. Either one would be acceptable. Welcome to the forum.
- Location
- Mission Viejo, CA
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- Professional Electrical Engineer
I echo the welcome and previous answers.
Since this was posted in the Hazardous Location forum, I need to ask the question whether the receptacles are located in a classified location or not; and, if so, how is it classified since there could be a few additional considerations? In general though, laboratories constructed consistent with NFPA 45 will have very little classified location requirements; so the previous answers are probably all that are necessary.
Since this was posted in the Hazardous Location forum, I need to ask the question whether the receptacles are located in a classified location or not; and, if so, how is it classified since there could be a few additional considerations? In general though, laboratories constructed consistent with NFPA 45 will have very little classified location requirements; so the previous answers are probably all that are necessary.
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