Reply by Catspaw

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Posted on Power Tool voltage\amp question (Bandsaw)

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236 posts in 3812 days

#1 posted 01-01-2008 01:30 AM

o.k. I’m going to see how much trouble I can get into here.

110V/10A = 220V/5A. (Refer to mski Ohm’s law….thanks decou i’m trying to read all that’s there) No energy saving…..except at start up nominally.

220 will save your motor since it starts easier.

Heat is a motors worst enemy. Less amps = less heat = longer life.

Every residential panel has two phases. That’s why one set of breakers is on one side and the other set is on the other side. A 220v breaker is clipped in to contact both of these phases. Each phase is 60 Hz but 180 degs out of phase with each other (refer to BroDave). Each phase is 60 cycles but there are twice as many peaks and valleys. My analogy is….you push a tire [upright], you run after it, push it again. 1 man 1 energy. Or you push, then your friend pushes while you run. You push while your friend runs. It’s easier for both of you but, you use 1/2 the energy as does your friend. Same amount of energy. Just split. And you last longer ‘cause you’re not as tired (....get it….”tired”)

Voltage drop is nominal as most wire is derated for that very reason. Hence, code spec.s for wire. You go up a gauge after about 100’. 40’ or 50’ in a house or garage is usually not enough to signifcantly effect the machine. If your lights are dimming when you turn something on then there are other issues that could be addressed. It may be that with everything else that is turned on, the service to your establishment may have an effect. A 10A draw on 100A service is twice as heavy, in proportion, as the same draw on 200A service.

But don’t let that fool you. Too many outlets have been wired with 14awg on a 15A breaker. There’s a little quirk in the building codes that allows you to put an outlet rated for 15A on a 20A circuit (or 15A). You may have something that needs a 20A circuit that’s wired for 15A. I think people assume their outlets are rated for 20A. That doesn’t quite make sense. But…well….it does to me….maybe it’s not relevant.

uh….my brain is empty now. time for celebration. ( my tag should probably be ‘I talk…..what I say is either right or it’s not….yer choice.)

-- arborial reconfiguration specialist

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