Want to confirm 600/120 VAC single phase step down transformer wiring

[Installer]

Saw this in the field, just want to confirm its correct. Acme part number T-2-53113-1S (3KVA transformer)

H1 and H4 are at 600 VAC. X3 and X1 are not used--wire nuts on them
Will X3 and X1 both be at 120 VAC? In other words will X3 to ground=120 and will X1 to ground=120?
By the way why are X and X3 tied together? To increase Ampacity at load?

Out of curiosity, how would I get 240? Would I ground X4 and X1 = 600 VAC, with X2 and X3 not used?
Thanks in advance

Any comments about Neutral, because I don't see it

 

[iceworm]

Assumption: This transformer is the same as every other normal small 600/240/120 transformer

I think the artist left the jumper off of X1-X3. If you measure between X1 - X3, the voltage should be near zero.
For 120V output:

x2-x4 is the neutral
x1-x3 is the 120V​

For 240V output:
Jumper x2-x3, this is the neutral - normally grounded

x1 will be L1, 120 to neutral
x4 will be L2, 120 to neutral
x1 to x4 will be 240V​

And I'm thinking you already likely knew this - the xfm is something really screwie.

the worm

 

[Installer]

Assumption: This transformer is the same as every other normal small 600/240/120 transformer

I think the artist left the jumper off of X1-X3. If you measure between X1 - X3, the voltage should be near zero.
For 120V output:

x2-x4 is the neutral
x1-x3 is the 120V​

For 240V output:
Jumper x2-x3, this is the neutral - normally grounded

x1 will be L1, 120 to neutral
x4 will be L2, 120 to neutral
x1 to x4 will be 240V​

And I'm thinking you already likely knew this - the xfm is something really screwie.

the worm

Thank you--it makes sense and I fixed the drawing. Because I metered X3 and X1 at 120 VAC when i was there.
One last questiion--X2 and X4 are now the neutral?

 

[iceworm]

... One last questiion--X2 and X4 are now the neutral?

View attachment 22701

Well, the output is 120V. So you could call x2-x4 "the neutral" or "the grounded conductor"

 

[LarryFine]

Look at each secondary as a 120v source (which it is). Place them in series and you have 240v with a center tap, just like the POCO transformer feeding your house.

Place them in parallel and you have 120v at twice the current of either one, just like POCO does when they make a bank of transformers to supply 208Y/120 3 phase.

Either connection allows for full power of the transformer, unlike you would have if you used only one secondary to supply 120v and left the second secondary unused.

 

[Jraef]

That is not the standard wiring diagram for that transformer, someone made that up.
Here is Acme's diagram;


So what they had done was make the X2-X4 connection a Neutral, giving them two parallel 120V circuits from X1-N and X3-N, but that would NOT be 240V from X1 to X3. Each of the 120V circuits would be at 1/2 of the rated secondary capacity, so that can be really dangerous if using only Primary protection, you MUST have two separate secondary OCPDs to protect those windings.