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I have a clothes dryer that runs sometimes and other times bypasses the 30a breaker it is on and trips out the main. The dryer comes from a breaker in a feed through outdoor panel. Everything seems tight on both ends, it doesn't seem to pull more than expected with an amp meter on it. Not sure what else to do? The only other thing that looks weird is: the line coming in from the meter goes to the lugs on bottom of panel, then feeds through breakers, then main is bolted on, then it feeds the house. Does this seem right?
 

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Electrical Contractor
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3,368 Posts
I sounds like you have a reverse-fed feed-thru panel.

As long as there are less than 6 total breakers out there, it should qualify as proper service equipment.

You have said that it trips the main, yet the dryer continues to operate once that main is tripped? Is that correct? Does it ever trip its own breaker?

Does that main breaker feel warm to the touch when it trips out?
 

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I=E/R
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2,052 Posts
You didn't tell us what size main you have. To help you understand what may be happening, let's assume you have a 100 amp main breaker. With the dryer off, let us also assume your panel load from everything in the house is 80 amps. You now turn on the dryer and add another 25 amp load to the panel. The dryer breaker won't trip but now the main has 105 amps against it...
There is also a possibility that one side of the panel has a much higher load than the other side.
 
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