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#195178 - 07/14/10 11:00 PM 15 amp circuits commercial?
watersparkfalls Offline

Registered: 03/08/05
Posts: 210
Loc: Washington...Not DC
I am looking at a plan for an auto parts store, it calls for lighting to be 20A ckts and gen outlets to be 15A, along with exhaust fans, printer ckt. Isn't there a code requiring all commercial lighting and plugs ckts to be 20 Amps? Or is that just how I've always done it?
Thanks guys,

Edited by watersparkfalls (07/14/10 11:00 PM)

2014 / 2011 NEC & Related Books and Study Guides
#195182 - 07/15/10 12:03 PM Re: 15 amp circuits commercial? [Re: watersparkfalls]
HotLine1 Offline


Registered: 04/03/02
Posts: 6791
Loc: Brick, NJ USA
There are no NEC requirements for 'general purpose' comm receptacles, spacing or ampacity.

However, you may have something in your local codes. Otherwise this is a design issue.

Now, talking about what I call "normal trade practices" comm work would be all #12 & 20 amp circuits; that's how I did it, but that's not NEC for GP circuits.

#195184 - 07/15/10 02:47 PM Re: 15 amp circuits commercial? [Re: HotLine1]
George Little Offline

Registered: 01/18/04
Posts: 1492
Loc: Michigan USA
I would add to what John has said that using 15a. circuits for receptacles you will be looking at no more than 10 receptacles on a circuit (assume non-continuous), continuous load would only allow 8 receptacles on a 15a. circuit.
George Little

#195214 - 07/18/10 04:27 PM Re: 15 amp circuits commercial? [Re: George Little]
Tesla Offline

Registered: 06/16/04
Posts: 1280
Loc: Sacramento, CA
With my AHJ...

#12 is the smallest conductor permitted in Commercial Construction -- to include Romex -- and to include motor loads.

With such a local rule -- no commercial design uses 15 Amp breakers normally. No cost savings are to be had -- instead you end up using more breakers and circuits to handle the total load.


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