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#1
01-24-10, 06:05 AM
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Join Date: Jan 2010
Location: CO
Posts: 5

WHere would I find the calculation for the maximum load from a 50A feed to a subpanel in a remodel basement? thanks

#2
01-24-10, 06:19 AM
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Location: VA.
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Without sounding like a smart butt, it would be 50 amps wouldn't it?

#3
01-24-10, 07:10 AM
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Join Date: Jan 2010
Location: CO
Posts: 5
Sorry. I meant how much in face value breakers (15,20A) can go into a sub panel where the subpanel is fed from a 50A from the main panel 30 feet away.

#4
01-24-10, 07:28 AM
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Join Date: Jun 2008
Location: VA.
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I think what you would want to do is a load calculation. By doing so, you can see what load is going to be on your panel. The number or sizes of breakers really have no bearing on the actual load. Your main panel may have breakers that add up to 400 amps.

You could have 100 amps worth of breakers but the actual load may be 40.

Go here and open the residential load calculation worksheet and see what the amount of load you're adding.

Mike Holt

#5
01-24-10, 07:41 AM
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Join Date: Jan 2010
Location: CO
Posts: 5
OK thanks. It is just a couple dozen convenience plugs, 20 can lights and a steam room unit (29Amp). So at .625A per canlight, I think it's OK. The problem is I'm not certain of the exact wire spec on the line between the main and the sub, so am hesitant to change anything. If breakers in the sub trip in service, I'll have to dig deeper into the feed to the sub, and call a pro.

#6
01-26-10, 08:25 AM
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Join Date: Feb 2005
Location: Near Lansing, Michigan
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Here's how I would break it down:

general-purpose receptacles @ 3W/ft^2 (guessing 1000 ft^2): 3000W
can lights: 20 @ 65W = 1300W
steam unit (you didn't say 240V or 120V. I'm guessing 240V) 29A * 240V = 7000W

total: 11300W

A 50A panel can supply (50A * 240V) 12000 watts. That means you're just within the range of this panel.

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