Reply by TopamaxSurvivor

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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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22827 posts in 4961 days

#1 posted 03-30-2021 01:27 AM

I am IBEW too. ;-)) I use the same data Square D publishes based on the National Electrical Code requirements. Power is basically Amps x Volts with lots of other minor factors for AC vs DC. Like ibewjon points out a Sears Craftsman shop vac rated at 5 hp can’t run on 15 amp 120 volt circuit. 5hp at 120 volts draws 56 amps and 28 on 240. When my Sears 5 hp-peak vacuum started on my 15 amp circuit remodeling the bath last year it dimmed the lights slightly starting. My electrical panel is Cutler Hammer. They have thermal (as most do) and magnetic (most don’t expect Square D) overload protection. Square D and CH breakers trip so quickly on overload you cannot see a spark with a dead short most of the time. There is no way that vacuum will run drawing 5 hp worth of amps (56) on 120 v. I did not measure it, but I doubt it is drawing more than 9 or 10, a 1/2 hp worth on 120 v.

Your 2HP/12amp dust collector should be 2 old-fashioned hp at 240 v. or 3/4 at 120v. The 2HP/7.5amp table saw could be 1 old-fashioned hp at 230 volts or a 1/3 old-fashioned hp at 120 v.

I have no idea how they claim a 5 hp vac can run on a 15 amp circuit. I suppose they use lock roto amps or may peak staring amp, but those are not really measurment so of horse power produced.

Edit: Many many moons ago a customer had a 5n hp compressor I wired. There is not enough room in the top of my Sears Craftsman shop vac for a 5 hp motor ;-))

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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