11kVA 3 phase supply

[Guest123]

It's there or there abouts.

11000/(400 x 1.732 x PF (unknown)) = 15.88A.

 

[ian.settle1]

its the single phase voltage times the number of phases.

I got this formula off one of the forum pages. I didnt know if it was correct thats why i asked about it. Ive since talked to an industrial electrician who told me its the correct formula to use.

to find the 3 phase voltage from single phase you multiple the single phase voltage by the square root of 3 (1.732) not by 3.

 

[Engineer54]

It's there or there abouts.

11000/(400 x 1.732 x PF (unknown)) = 15.88A.

That's the correct calculation to use Lenny... root 3 rules!! lol!!

 

[ian.settle1]

It's there or there abouts.

11000/(400 x 1.732 x PF (unknown)) = 15.88A.

Confused by your answer Lenny as

400 x 1.732 = 692.8

400/1.732 = 230

230 is single phase voltage if your 3 phase voltage is 400

 

[Guest123]

Confused by your answer Lenny as

400 x 1.732 = 692.8

400/1.732 = 230

230 is single phase voltage if your 3 phase voltage is 400

Sorry Ian, what are you confused by??

The calc is correct the sum is 15.88A per phase.

 

[ian.settle1]

Sorry Ian, what are you confused by??

The calc is correct the sum is 15.88A per phase.

So what you are saying that he has a single phase voltage off 400 and a 3 phase voltage of 692 that is what I am saying from your calculation.

 

[snowman]

to find the 3 phase voltage from single phase you multiple the single phase voltage by the square root of 3 (1.732) not by 3.

ian it was the max current per phase i was after not the phase to phase voltage but thanks anyway.
The formula i found must be a rule of thumb or something cos it works out just about the same as the formula lenny gave.
thanks for the input.