GFI breaker working across a transformer - 01/25/06 11:22 PM
We've got a 2500A GFI breaker that has tripped several times on a ground fault that we can't find. It happens days apart.
This is one of two main breakers that feeds a 260K sq ft building at 480V. There are several small and large transformers all over the building to provide other voltages.
I called in our electrical contractor since we were stumped and he told us that a GFI can "see" a ground fault even if it's on the secondary side of our transformers.
I'm not sure I believe this and wanted more opinions.
It seems to me that the GFI breaker feeding the transformer can't possible know if there's an imbalance on the secondary side.
This is one of two main breakers that feeds a 260K sq ft building at 480V. There are several small and large transformers all over the building to provide other voltages.
I called in our electrical contractor since we were stumped and he told us that a GFI can "see" a ground fault even if it's on the secondary side of our transformers.
I'm not sure I believe this and wanted more opinions.
It seems to me that the GFI breaker feeding the transformer can't possible know if there's an imbalance on the secondary side.