This drill has a two-wire cord, and the drill states that it is "double insulated". I have yet to really understand this concept.
Basically, anything and everything which
could result in a short causing a metal casing to become energized. For example, where the wiring connects to the motor terminals a broken conductor moving around enough could contact the case. So the whole lot gets put under another insulating cover, hence the
double insulation. It's then considered unnecessary to ground the casing since the chances of any internal short causing it to become are energized are extremely small.
I don't like the idea of metal cased cordless tools where the bit or blade could have continuity to the metal case.
A good point. If I'm going to accidentally hit an energized conductor with a drill bit, I'd much prefer the whole case to be grounded in the old style than to be "double insulated" but with continuity to the chuck.
