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At least the plumber didn't plumb the safety relief pipe into one of the panelboard knockouts!
I was on a job once where water started pouring out of a junction box on a fire-alarm riser. Seems that one of the laborers needed to get rid of some pooled water on one of the higher floors and decided to pump the water down the nearest "drain" which happened to be a piece of 1" rigid stubbed through the deck. [Linked Image]

I knew it was asking for trouble using the same pipe thread as the plumbers! [Linked Image] [Linked Image]

-John