power calculation

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robdols

Member
When calculating VA(volt amps) what voltage would I multiply amperage by when using a 3 phase 120/240 volt high leg source?
This is derived from single phase power, I believe, with 120/240 with an added 208volt + or - high leg. Is this just 120/240 delta?
Does this make sense?
I know with 3 phase wye I use 360 for 120/208 or 830 for 277/480.
I hope I'm making sense. Thank you.
 

jtester

Senior Member
Location
Las Cruces N.M.
Re: power calculation

When calculating 3 phase loads on a high leg delta, the multiplier is (240x1.732) or 415.68.

For example 100 amps of 3 phase load would give
240 volts x 100 amps x 1.732 = 41,568va
 

eric stromberg

Senior Member
Location
Texas
For three phase circuits:

P = V (line to neutral) * I * 3
P = V (line to line) * I * sqrt(3)

Eric Stromberg, P.E.
Lake Jackson, Texas
 
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