50 kVa XFRM

[Hfalz1]

I have a 50 kVa dry type XFRM single phase voltage says 240 x 480 - 120/240 60Hz. Can i use this xfrm if i am coming from a 480v 3phase panel into a single phase 120/240v 100A panel?

 

[Hfalz1]

Or what if same XFRM with a 200A 1 phase 120/240V panel?

 

[Jraef]

Regardless of the size of the panel, it’s still a 50kVA transformer. That’s your limit.

And yes, of course you can feed it with 2 phases of a 3 phase service.

This is pretty basic stuff and you have now asked basically this same question twice in different threads. Are you really an electrician?

 

[petersonra]

It appears to be a single phase transformer. as long as you feed it that way and protect it appropriately you are fine. You can feed it into any size panel you want. You might not be able to use the main in that panel as protection for the secondary or secondary conductors depedning on the xfmr rating and the mains rating, but you could always put fuse

 

[JFletcher]

Regardless of the size of the panel, it’s still a 50kVA transformer. That’s your limit.

And yes, of course you can feed it with 2 phases of a 3 phase service.

This is pretty basic stuff and you have now asked basically this same question twice in different threads. Are you really an electrician?

Once you're exposed to it, yes it is pretty basic. Then again, it's possible that a residential sparky has never wired one in his career, never dealt with 3 phase, whereas more of commercial or industrial electrician has wired a transformer like the OP describes maybe once a week for years and could do it in his sleep.

I'm giving the OP the benefit of the doubt here. The first time I wired in a 45kva 480 - 120/208V, I was bit apprehensive and unsure. and I recall a topic here a while ago of a lifetime industrial electrician who was pretty clueless in using NM - he'd never held a piece of it in his career.

50kva/240V = 208A secondary side, fine for a 200A 120/240V panel. What wire sizes and OCPD are needed, bonding, grounding, etc. are up to the OP or his supervisor, what code cycle he is on, etc.

 

[Jraef]

Once you're exposed to it, yes it is pretty basic. Then again, it's possible that a residential sparky has never wired one in his career, never dealt with 3 phase, whereas more of commercial or industrial electrician has wired a transformer like the OP describes maybe once a week for years and could do it in his sleep.

I'm giving the OP the benefit of the doubt here. The first time I wired in a 45kva 480 - 120/208V, I was bit apprehensive and unsure. and I recall a topic here a while ago of a lifetime industrial electrician who was pretty clueless in using NM - he'd never held a piece of it in his career.

50kva/240V = 208A secondary side, fine for a 200A 120/240V panel. What wire sizes and OCPD are needed, bonding, grounding, etc. are up to the OP or his supervisor, what code cycle he is on, etc.

Point taken...