480v grounded 3 phase serving an oil well pump jack

[winnie]

IMHO the question of 'where can the grounded conductor serve as the fault current path' is a side discussion from the OP's issue.

The utility grounded conductor functions as part of the fault current path. The NEC splits this function to a separate EGC. This combined function is still permitted for the emergency disconnect. We can debate it endlessly.

The OP's issue is either the lack of proper bonding between grounded conductor and EGC, or proper ground fault detection.

Jonathan

 

[amerijet]

Ok finally got a look at the source (power pole disconnect) I only have two line fuses so is that corner grounded 480 transformer and if I have three line fuses is that 480 grounded phase? First time I ve seen just two line fuses.

 

[amerijet]

 

[amerijet]

At the pole with main disconnect

 

[jim dungar]

Ok finally got a look at the source (power pole disconnect) I only have two line fuses so is that corner grounded 480 transformer and if I have three line fuses is that 480 grounded phase? First time I ve seen just two line fuses.

The configuration of the utility has little to do with the grounding or ungrounding. At the best you can tell is it is an open delta.

 

[retirede]

The op is describing what I suggest we call a TT system, the NEC obviously does not permit a TT system, in places where TT systems are legal they use RCD's or GF relays extensively.
The term 'TT system' is a easy way to refer to systems like this where the earth is the only fault path back to the utility;
View attachment 2582325

What I’m describing would have a second OCPD/disconnect at the load end.

 

[don_resqcapt19]

Ok finally got a look at the source (power pole disconnect) I only have two line fuses so is that corner grounded 480 transformer and if I have three line fuses is that 480 grounded phase? First time I ve seen just two line fuses.

Those are the primary fuses and have nothing to do with the configuration of the secondary. Might be able to tell if we could see all of the secondary conductors. Given the white conductor and its connection to the case of the transformers, I would guess it is a corner grounded system, but can't tell for sure without seeing the opposite side of the transformers.