"Harry Pye" wrote in message
roups.com...
I have heard that you
shouldn't run 20 amp tools on a 30 amp circuit.

You have it bass akwards. You shouldn't run a 30 amp tool on a 20 amp
circuit. A short in a 20 amp tool will draw well over 30 amps and take the
breaker out like it should.

Which, oddly enough, is the reason they make the plugs different. To
prevent you from doing so.

Clever folks who wrote the NEC, what?