Twist lock plugs are great. The only caveat is that if you use them
anywhere, you will want them everywhere. In my shop I use a lot of the
duplex 110/220 outlets. I realize they are not code everywhere. I find
this setup handy. Virtually all my stationary tools are 220. They're
mostly on casters so I do move them around (except the table saw).
Sometimes I run on extension cords. Twist lock would be handy with the
extension cords because one does sometimes tend to pull on them.

bob g.

wrote:

I think twist lock plugs work best. They don't tend to "walk" out of the socket.

This gives you better reliability. IMHO
Frank

Dave wrote:


I'm doing home renovations downstair, and decided that at the same time
I would bring 220 volt power to the shop (by doing it now I save the cost of
a repeat electrical inspection). My shop isn't ready for that yet but I hope
to build a woodworking shop over the next few years. I've already wired in
#6/3 loomex wire to a 70 amp subpanel on a 50 amp feeder fuse, just so I
don't have to worry about being underserviced later. 120 volt service is
excellent already.

Not yet having the tools to compare plug configuration, I am a little
unsure which 220 volt plug would get the most general use. Early candidates
for 220 volt service would be a planer, 8" jointer, maybe a dust system.
Would it be reasonable to wire in a small 20 amp plug, with the expectation
that I would use that one the most? Ideally I should wait until I get the
device before completing the wiring, but I fear that the electrical
inspector will not approve the new wiring job unless there is at least one
circuit completed.

Dave