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Here's one I found on a service call. Got the call for "parking lot lights not working". The customer is a nice guy, but way too busy managing his restaurant to be trusted with anything mechanical.

My boss tells me to go to the location, flip the override for the lighting contactors timer to turn the lights on, and let him know if I find "anything unusual". No problem, especially as he's got more experience with 3ΓΈ installs anyway.

When I got there, the manager said that he'd already flipped the override, and the lights on the outside of the building had come on, but not the lot lights themselves. I opened the contactor panel and did a quick "wiggy" to verify that both sets of contactors were getting (and giving) voltage. They were. I was about to check the neutrals and happened to notice an empty wire nut sitting on the bottom of the box.

[BS alarm going off]

Looking more closely, I saw that it was, in fact, half of the shell of a wire nut, and there were slender nylon filaments leading back up to a cluster of wires. The conductors were in fact broken in several locations in the vicinity of the fault.

The customer stated that the lights had been DNF for about a week. I called my boss and told him that there were bigger issues here than just the timer.

He came out the next day and metered everything. Turns out that the original installer had pulled several doozies:

1) Branch and home run neutrals were sized for load of a single circuit. Would have been fine if he'd put in three conductors - one for each phase - instead, he seemed to have pulled only one.

2) For the run to the first box outside, he pulled 8 hots in one 1/2" EMT, the other 2 hots and the heutral in the other. My boss said that the pipe was warm enough to keep you from touching it for very long.

3) Loads were split among the phases. Only problem being, it was 2.2a on one phase, 18.7a on the next, and 3.8a on the third.

4) Other splices were investigated and several were found to not be securely fastened.

5) Conductors were undersized per the load calcs my boss did.

Needless to say, he and one of the other guys distributed the load a little more evenly, and got everything back in working order. The customer was informed of the inadequacy of the install, and we're waiting for the go ahead to re-pull the circuits.

Not the first issue this customer has had with the original install, and most likely not the last either.

- DougW
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