On Saturday, July 18, 2009 at 8:54:36 AM UTC-5, Me Name wrote:
On Jul 18, 9:38Â*am, (Doug Miller) wrote:
In article , wrote:
On Fri, 17 Jul 2009 17:51:50 -0700 (PDT), stan
wrote:
[...]
There were also IIRC some scrapped three pole breakers.
Just trying to recall the voltage ratios between our domestic 115/230
volts and three phase voltages. Can anybody help with a quick
tutorial? Such as; 345 volts is to say 208 volts as 115 is to ????

Sounds like a 600 volt nominal 3 phase system

If we use 208 and 117, the ratio is 1.77, and 1.77X345 = 613.

Actually, the ratio for three-phase voltage is the square root of three =
1.73205...

208 / sqrt(3) = 120.09
345 * sqrt(3) = 597.6

Yup that sounds about right. Was too lazy at that time of night (here)
to pull out a text-book!
S.Market would likely have had the approx 600v phase to phase with 345
phase to neutral.
Cheer




If the motor is single phase need to check the following. Is the motor three phase or single phase? If single phase change the motor to one that requires 220 volts.