The hazard
A live wire looks exactly like a dead one, and your body can become part of the circuit. Electrical contact can cause shock, burns and electrocution, and even a small shock can make you fall from a ladder. How badly you are hurt depends on how much current flows, the path it takes through your body and how long the contact lasts.
The action
Do not plug in or unplug energized equipment with wet hands. Keep cords and connections out of puddles, and use cords and tools approved for wet locations when the work is wet. Take off rings, watches and metal chains when you could contact exposed live parts. (29 CFR 1910.334(a)(5)(i))
ASK THE CREW
What do you look for on a cord or tool before you plug it in?
From the talk: Electrical safety. Read it in full, free, with the questions and the sign-in sheet.