Power Load Question
Power Load Question
(OP)
I have a 480V 50A Breaker, with a transformer 480V/120V that's 25kVA, and a power panel pulling 15A.
Can I add another power panel to the transformer pulling 50A if I increase the main breaker to 100A?
If not, then what's my limiting factor the transformer or the breaker?
Can I add another power panel to the transformer pulling 50A if I increase the main breaker to 100A?
If not, then what's my limiting factor the transformer or the breaker?






RE: Power Load Question
RE: Power Load Question
From your description, I strongly suspect that your present installation is not in compliance.
Bill
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"Why not the best?"
Jimmy Carter
RE: Power Load Question
RE: Power Load Question
RE: Power Load Question
I suspect the max CB allowable for your TX is 50A. i doubt you can increase it to 100A. You might have to increase the TX size, but again, that depends on your calc/studies. If you do, remember you need to make sure your Panel and your cables are rated for the new ampacity of 100A.
RE: Power Load Question
RE: Power Load Question
Let's get a little bit clearer on the system: We got "480/120", "3 phase", "25kVA".
I've never seen a 25kva, 3ph transformer. That is a single phase size. 3ph would be 30kva.
If the system (transformer and panel, not the 480V feeder) is 1ph, then I would expect 480/240/120
If 3ph, then 480/208/120.
Of course you could have 1ph, 480/120. Not very common, but there are some.
So, what is the system?
iceworm
Harmless flakes working together can unleash an avalanche of destruction