This is why Electricians don't use Romex in wet environments (TROUBLESHOOTING OUTDOOR LIGHTS)

Before you go pulling that NM cable through some smirf-tube underground, watch this video. Conduits installed in underground environments are considered wet, and NM cable IS NOT A WET-rated conductor.

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This was a quick and easy little troubleshooting job. The customer called and said they had a circuit that kept tripping everytime their timeclock came on, which controlled their outdoor lighting. So I decided to stop by and check it out.

I found all of the bulbs installed were incandescent candelabras, which can break easily and sometimes show as a short circuit while troubleshooting. I found quite a few bulbs that were bad, so we just took all of them out to see if that would clear the fault. It didn't. We flipped the breaker and it still tripped, with no bulbs in the fixtures. I inspected all of the sockets at each fixture, and there were no visible signs of anything shorted out or melted, so I began to think there may be issues with the wires inside the fixtures.

This is less likely to be the case, but I also noticed no weatherproofing at the base of each fixture so the likelihood of moisture getting into the fixtures was pretty. Upon opening all of the light fixtures I verified that the conductors inside the stone were soaked at every location. The problem with this is that Romex (NM cable) is not rated for wet environments. The insulation around the conductors is not made of a material that is rated to withstand moisture, and over time can break down and cause a short circuit to occur.

This is exactly what happened.

#electrical #electricaltroubleshooting #wiring