I'm in the process of adding a lot of additional receptacles in my basement workshop. I've got 2 220 circuits for power tools, one is 20 amps and one is 30 amps. #12 for the 20 amp circuit and #10 on the 30. So the question, is it acceptable to use a 15 or 20 amp receptacle on the 30 amp circuit? I'm using the L6-30R types on most of the 30 amp circuit but in one spot I'd like an alterate location for one of the lesser tools. I've tried it and the 10 gauge wire can be formed and screwed down tightly, it's a chore but it can be done. Or maybe I should just bite the bullet and replace everything with the L6-30R types. The 20 amp circuit currently powers a 3hp table saw, it will never power more than 1 tool at a time. The 30 amp circuit has a 2hp dust collector and may well also power an additional 2hp or perhaps someday 3hp tool at times.