I encountered an issue at a restaurant. A bunch of small 15-20A single-pole 120V GFCI breakers are tripping, they feed GFCI receptacles. We didn't design the system. There is no load on the circuit (i.e circuit is wired, but nothing is plugged in).
First thought was to check neutral and ground bonding in the main and sub panels. Two techs completed that today and didn't find anything.
Other issues of note:
1. This restaurant is in a high rise building and shares incoming power (downstream of PCC) with others.
2. Very hot in the electrical room (90 degrees with the door open). Main panel is next to a step down XFMR (480 -> 208)
Any insights are appreciated. Thanks
First thought was to check neutral and ground bonding in the main and sub panels. Two techs completed that today and didn't find anything.
Other issues of note:
1. This restaurant is in a high rise building and shares incoming power (downstream of PCC) with others.
2. Very hot in the electrical room (90 degrees with the door open). Main panel is next to a step down XFMR (480 -> 208)
Any insights are appreciated. Thanks