In my earlier days I didn't pay attention to things like this and had a tank that would 'splash' a little water out over time. It finally was enough to to spark an extension cord and catch on fire, which also caught the carpet on fire, but that carpet was actually so wet from the 'splash' over time it put itself out.
When I got home from work the house was a little smoky. I went back a redid every cord in the house. I keep the extension cords off the ground. I made sure all the wires went to an up position to plugged in so moisture would not build up on the power strips