Reply by HokieKen

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Posted on Is it possible to run a 2hp Dust Collector and Saw on a single 240v/30amp dryer circuit?

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19910 posts in 2426 days

#1 posted 03-30-2021 04:06 PM

It is magic. Among engineers, Electrical Engineers are known as “black magicians” or “masters of the dark arts” ;-P And those are in no way meant as insults. Just a little playful banter to acknowledge that anyone that understands electricity is far smarter than us lowly mechanical guys.

I imagine that the NEC rules for what size plugs can go to what circuits/receptacles have a lot to do with total wattage and the derating of the materials used for said plugs. The total wattage jump from a 15 to 20 amp circuit at 115V is only 575W. But the jump from a 20 to 30A circuit at 230V is 2300W. And like ibewjon said, some portions of the code are based on empirical data rather than actual calculations so that makes it even more confusing. Personally, I just go with. I have no doubt there are good reasons behind it, even that parts that strike me as not making any sense ;-)

-- I collect hobbies. There is no sense in limiting yourself (Don W) - - - - - - - - Kenny in SW VA

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