Yup, be careful where you put them. I had a near fire just over a year ago when my skimmer overflowed and was splashing outside the sump onto a power bar I had hung on the wall. My sump room is downstairs, and we heard the fire alarm go off down there. I ran down downstairs to see a bunch of smoke, melted plastic and a charred wall. But no fire, luckily. And the breaker didn't even go off.
Needless to say, I have corrected that situation so it can't happen again.
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