"Tom B" wrote in message
...
On Fri, 04 May 2007 16:40:19 GMT, "Toller" wrote:



Better do a slower calc. Probably about 23a.



Don't doubt you're right as I just used:

E=IR or I=E/R

W=I^2R or I*(E/R)*R

therefore
W=EI

so 220V*20A = 4400 watts (avaialble)

1HP (electrical) = .746KW (source IEEE handbook circa 1968)
4.5HP= 4.5*746 = 3357 watts (required)

Obviously I missed something like adjusting for efficiency.

Don't have the saw yet so I can't read the plate on the motor.

In any case, thanks for the input.

Regards.

Those are calcs based on Ohm's law which is for DC. This AC. You have to
include Power Factor. There's also efficiency. Both will yield a higher
current than your calcs.

Bob