I recently installed a monorail lighting kit in my home office; I wanted another spot-light which meant I need to swap out the included transformer to something that would allow more than 100 watts.

I now have the issue of random breakers tripping. When this light is turned on. (I did not have this problem w/ the original transformer)

It seems that when my closet light in my bedroom (on a different circuit) is turned on; and my new office light is turned on, my bedroom circuit is blown 100% of the time.

Here's the weird part. I can have my master bedroom light on or my master bathroom light on and all is well. The instant I turn my master closet light on the whole bedroom circuit fails. Not only that, it will sometimes trip other random breakers, like the washing machine breaker ..or the downstairs kitchenette breaker. I have two breaker boxes, my master bed circuit resides in box 1.. but can somehow trip a breaker in box 2.

As far as my home-office circuit; it's never tripped. But, it is the only common denominator I have. For the time being; I need to ensure that if my wife is getting ready in the bedroom (walk-in) closet that my home-office light is off.

  • 4
    What make and model of breakers do you have, and are these AFCI or GFCI breakers tripping? – ThreePhaseEel May 10 '16 at 11:41
  • 1
    I think you're going to have to call in a professional to investigate. Things like this are difficult to troubleshoot through the internet, especially since you've told us nothing about the wiring. – Tester101 May 10 '16 at 11:54
  • Almost a guarantee that you either miswired hot vs. neutral when installing the transformer, or the transformer itself is bad. – Carl Witthoft May 10 '16 at 13:06
  • I agree with ThreePhaseEel looking at AFCI breakers have a tough time telling an arc from switching powersuplies. Many electronic ballast also will cause this when the circuit is less than 50% loaded but the lights are heavily dimmed or lightly loaded switching supplies. – Ed Beal Aug 29 '17 at 16:34

As mentioned in previous response, I would assume the repl. transformer is miss wired and it sounds like the effected breakers are likes GFCI and/or AFCI which means they are more sensative. Some of the Rail lights use the fixture structure as a conductor on the LV side fo the transformer. If you are not careful to isolate and not cross to ground this would cause similar problems.

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