Why does this keep happening

[Therealcrt]

I’m doing some troubleshooting on some parking lot pole lights there are two circuits sharing one neutral going out from the contactor cabinet to the pole light. I disconnected all of the incoming wires to the pole, separating everything when I turn the circuits on and cover the photocell to close the contactor. It blows the contactor and keeps the contactor in a stuck closed position. I’ve replaced two contractors now there is no continuity between any hot and ground or any hot and neutral or any hot and hot when I have one circuit on it holds the breaker, but when both circuits are on it trips, both breakers Again there is no load connected no indicator of a short or fault it’s 277 V to add And the contactor is a three pole 30 amp 277 V coil contactor. The breakers are single pole 20 amp breakers.

 

[infinity]

What kind of contactors are you using. Can you post some photos?

 

[jim dungar]

Duplicate thread. Reply here.

Lighting contactor

tell me why this keeps happening I’m doing some troubleshooting on some parking lot pole lights there are two circuits sharing one neutral going out from the contactor cabinet to the pole light. I disconnected all of the incoming wires to the pole, separating everything when I turn the circuits...

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