KVA Calculation

[nkalghatgi]

I have 4 light poles (each with 0.513A) on circuit #1 phase A of a 277/480V panelboard. How do I calculate KVA of circuit 1 phase A of this panleboard.

Is it (0.513x4)x277/1000 = 0.142 KVA

 

[waedwards87]

You have the calculation correct but it looks like you've computed it incorrectly.

(0.513A * 3) = 2.052A

* 277V = 568.404VA == .568KVA

That only represents that single phase load.

 

[nkalghatgi]

Thanks for the reply and thank you for the correction.

 

[bob]

You have the calculation correct but it looks like you've computed it incorrectly.

(0.513A * 3) = 2.052A

* 277V = 568.404VA == .568KVA

That only represents that single phase load.

You have the concept correct but it looks like you've computed it incorrectly.
(0.513A * 3) = 1.54A (0.513A * 4) = 2.052A * 277 = 0.568 kva.

 

[waedwards87]

Ha! yes, a typo. Thanks for the correction to my correction!