Originally Posted by David Tilston
Raz, DC loads are much more difficult to break. They never cross zero, so the current interrupting capacity must be de-rated for a switch that is designed for AC. As noted by others, there are switches that work for both, but are typically rated lower in a DC service.
And in the same vein, is the effect of getting shocks. (I know, going off track here
) I have had lots of shocks from 120 AC, and though it hurts a bit, it is easy to pull away from as the current alternates past zero. I have had a couple shocks from 130 DC (used as control voltage for equipment in electrical
substations), and holy crap does that hurt, it feels like getting hit in your whole arm at one time, and being a constant current, it does not let go as easily.
Anyhoo, back to your normal programming.