480v/3P -120v1P transformer wiring confusion

[riverjig87]

Well, like most, I have searched this forum and couldn't really find the answer I was looking for. Either way, here goes

I have a control transformer which has 480v 3 phase primary-120v single phase secondary. For some reason, the wiring diagram doesn't make sense to me. Being that it is a transformer, it is a separately derived system. I have always derived my grounded conductor from the XO bond to my GE.
Not to mention the wiring diagram doesnt make any sense. I havent had to deal with a tx like this before and would appreciate a way to understand it. Thanks

Please see the attachments

 

[petersonra]

It is not a 3 phase transformer. It is a single phase transformer that has 2 fuses on the primary and one on the secondary the way that control transformers of this type often are.

It is a small enough transformer that it does not require a direct GE connection. You can tie X2 to the EGC.

L1 and L2 are the 480 hots going into the fuse blocks and then into the primary.

X1 and X2 are the secondary. X1 goes to the 3rd fuse.

Usually the two fuses on the primary are class CC such as FNQ-R. The secondary is usually something like an FNM.

 

[riverjig87]

ok. I might have been VERY confused. So x2 is where I can tie X2 to my EGC and derive my grounded conductor. I was also mistaken by the third fuse. The designation "1" threw me for a loop as the directional arrow did. I really appreciate your help.