Posted by funtwohunt on August 03, 2011 at 19:26:31 from (63.172.252.159):
In Reply to: OT dusk to dawn light posted by Big Irish on August 03, 2011 at 18:53:46:
If you have a HPS light, they can be pretty senitive to voltage changes. It is not quite so bad if you have a Mercury vapor. Your light might be on a seperate breaker but your A/C is probably 240 V therefore the light shares one side of the 240V load with the A/C. They may have seperate breakers but those breakers are attached to the same phase in the breaker box. Same goes with all the rest of the breakers in the panel. They all share the same phase with other breakers in the panel. The light is evidently sensitive to that drop in voltage when the A/C starts. Same thing you see when you are using a arch welder that's turned up. The light flicker a bit when you start to weld. Try switching the light breaker with the breaker directly above or below the one its on. This will put it on the other phase. If this makes a difference then I would get a load (amperage) test on each 120v phase coming into the main and see if one side is loaded a lot more than the other. If it is try balancing the panel out. Good Luck. Funtwohunt
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