transformer

D

DoggedLeg

Member
Location
Austin, Tx
Occupation
Journeyman
A friend of mine has a little industrial shop currently powered with 120/208 that now needs 240 and 480 to test big steamers, the biggest being a 54A 480v. The tests last about 1 minute just to ensure they're working.
The current panel is a 200 A being fed by 3/0 with a few 20 and 30a breakers feeding lighting and a couple fridges.
My question is, can i come out of a 125A breaker with 2 AWG to a the transformer (being installed 10 feet away in sight) through and to a 60A load size main?
There will be a few drop down plugs for testing but never be testing more than one at a time.

my math tells me that if i want to get 55 A out of the load side I need to send about 125A to the line, does this sound correct? thats how im sizing the breaker and the wire on line side.


for the 208-240v, i was going to order a 15kva 240-208 and flip the leads.

Does this all jive to yall?
 
If we are talking 3 phase, 54 amps would be a 45 kva trasnformer.
You would to make sure a 125 amp 3 phase breaker is available for your panel.
If you proceed I strongly suggest you get a step-up transformer (208-480Y277) rather than "reverse feed"
 
augie47 said:
If we are talking 3 phase, 54 amps would be a 45 kva trasnformer.
You would to make sure a 125 amp 3 phase breaker is available for your panel.
If you proceed I strongly suggest you get a step-up transformer (208-480Y277) rather than "reverse feed"
Click to expand...
Yes 3 phase 208 up to 480. I found another thread that mentioned the same thing, I’ll look into a 45kva step up. Thanks a lot.
If the existing panel doesn’t have the ability to host a 125a then a fused disconnect would suffice wouldn’t it?
 
You must log in or register to reply here.
Top