480v grounded 3 phase serving an oil well pump jack

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
 
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.
 
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