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Joined: Sep 2013
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Personally from a safety point of view I don't see a problem with putting 1 upstream from 9 or so .. they usually have a 280 Watt rule per receptacle as far as a multiple, but that's just a generic wattage calc..

Last edited by MarkC10; 09/24/13 03:12 AM.

Anyone claiming to know everything about Electrical, is wrong.
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Originally Posted by MarkC10
Personally from a safety point of view I don't see a problem with putting 1 upstream from 9 or so .. they usually have a 280 Watt rule per receptacle as far as a multiple, but that's just a generic wattage calc..


It is 180va per.

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It should be noted the 180va is a commercial requirement, not residential.
In residential, receptacles are placed per 210.52 and you use 220.12 to compute the load based on square footage with those receptacles and 210.11(B) says you distribute them evenly across the required number of circuits.


Greg Fretwell
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Isn't 180 VA 1.5 Amps .. ? I' may be a little rusty on my calcs. I usually ever use the first 1/4 of the 4 calc groups


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Yes, 180Va is 1.5 amps at 120 volts.



John
Joined: Sep 2013
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thats what I thought john.

divided by 2400w (20A.) = 13 receptacles ...

that's pushing it .. for a lighting circuit.

I think the 280w rule was a school spec. at the time


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At best it is just an arbitrary number. They have no way of knowing whether you are going to plug in a 10 watt modem or a 1200w Laser printer.
We used to run into this exact problem in server rooms with a big modem or data switch rack. Occasionally we would have a fire inspector who would say flatly "no outlet strips" but if you had the electrician put in receptacles, you needed a half dozen or more 20a circuits to get enough receptacles for a few hundred watts of load.
Finally they came up with a U/L listed modem rack with a bunch of receptacles in it. That usually made everyone happy.


Greg Fretwell
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