Reply by Bill Davis

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Posted on Power Tool voltage\amp question (Bandsaw)

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Bill Davis

226 posts in 3948 days

#1 posted 12-30-2007 04:40 PM

I take technical issue on a couple of replies – sorry guys.

1. “2 lines to draw power” – that is no advantage nor is it unique to 220 circuits. Just try hooking up a 120 volt motor with one wire and see how it works. Every circuit has two wires to carry the power. One carrying electrons to and the other carrying electrons away. It doesn’t make even one bit of sense.

2. “You get two power cycles in the same 60 cycles power. basicly 120 cycles. 60 on each line. Where as the 120 has just 60 cycles.” Balderdash! They are 60 cycles of power each second and both halves of each cycle produce power whether its 120 or 240 volts.

And I doubt (but dont know for sure) that a given motor that can be wired for either 120 or 240 would run at a different efficiency when wired for one voltage or the other if supplied with the same amount of electrical power.

The main advantage of 240 as opposed to 120 is that at twice the voltage the current in the circuit is half that if run at 120 volts. That would result in less voltage drop in the wires supplying current to the motor. That could mean a bit more power actually supplied to the motor due to less voltage loss if all other factors are equal. That same result could be achieved by using correspondingly larger or shorter wire to the motor when run at 120 volts. And running on 240 might be more expensive if you have to pay an electrician to run the 240 volt circuit you don’t have. It would take a lot of motor running time at 240 to pay that bill. False ecomomy.

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