i AGREE WITH CELTIC. My only time I was ever shocked was with 120. Hooking up a fixture in a bathroom. With the switch off it should be dead right. I even stuck the tick tester on it. Well some one had cross polorized the leg before it got to the bathroom. I hooked up the ground and when I connected what I thought was the neutral i got locked on. If it was not for the painter I may not still be here.Next time ill check both the black and the white wires. All the time in the navy, around rocket launchers,gun mounts and high voltage nothing. With a lousy fixture I almost got hurt. Check everything and I do mean everything.I may no longer be in the field, but im sure some of my experiances can help.