SquareD xfmr

[anbm]

Does anyone know what this xfmr secondary wiring configuration? can it feed a panel need 208V (both single and three phase) and 120V circuits?

 

[infinity]

Looks like a 3 phase, 4-wire, 240/120 volt Delta secondary so no 208 unless you try to use the high leg.

 

[jim dungar]

That transformer has a 240V delta secondary with a center tap.
You cannot get 208V 3-phase from it.

 

[anbm]

Looks like a 3 phase, 4-wire, 240/120 volt Delta secondary so no 208 unless you try to use the high leg.

Do you have a wiring configuration, try to see which phases has 240V and which one had 120V, a 208/120V panel was connected to it.

 

[augie47]

The nameplate basically shows you the wiring configuration.
240v, X1 to X2, X2 to X3, X1 to X3
208v, X4 to X3
120v, X1 to X4, 120v X2 to X4

If you need 75kva a 753TH SquareD would give you 208Y/120

 

[anbm]

The nameplate basically shows you the wiring configuration.
240v, X1 to X2, X2 to X3, X1 to X3
208v, X4 to X3
120v, X1 to X4, 120v X2 to X4

If you need 75kva a 753TH SquareD would give you 208Y/120

Got it, how's about 240V/3PH load connect to this xfmr, will be X1, X2, X3?

 

[augie47]

 

[anbm]

There are any rules that X1 and X2 cannot exceed certain amp. rating vs. X3?

 

[Tulsa Electrician]

The secondary can be a:
High leg 3-phase 4 wire.
Corner grounded 3- phase 3-wire
Ungrounded delta 3- phase 3- wire

Depending on your three phase load (s) you may want to run a GEC to X-4 with a SBJ in the transformer.
With only three wires and an SSBJ secondary.

The netural rating for these usually around 5 to 8 % of it kva rating.

Should be listed some where on the trans.

 

[Tulsa Electrician]

The netural rating for these usually around 5 to 8 % of it kva rating.

I can not find the information to support this. At least not yet

I'll keep looking.

 

[Tulsa Electrician]

Did find this