I am updating the electrical in my garage. Right now, it has two GFCI 120v outlets, one on the outdoor outlets circuit and the other on the garage opener circuit. I am looking to add locking 240v outlets, and have two questions about it.
1. Can I install a NEMA 6-20 outlet, and connect a device shipped with a NEMA 6-15 connector, provided I change the connector to 6-20?
2. Can I install NEMA 14-20 outlets, and disregard the unused leg for different voltages? i.e. connect a plug to the outlet, and not wire the neutral to anything for 240, not wire anything to the second hot for 120.
Item 1 would be convenient because I wouldn't have to install both NEMA 6-15 and NEMA 6-20 outlets, and item 2 would be nice because I could wire 120v devices as locking with existing outlets.
EDIT: I'm talking about locking versions of these outlets.