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.


Locking or not, it makes no difference.

  1. Most likely yes you can. Provided the item does not stipulate that it must be on a 15A circuit.

  2. No, you cannot install 14-20R receptacles and only wire some of the terminals, if that's what you mean. Re-reading it I think you want to install the 14-20's normally and only use what you need as per each item. This would be OK.

  • Your assumption is true. But just to clarify, I would wire the receptacle normally, and use only the correct wires off the plug, right? – kewltek Jul 19 '14 at 1:43
  • Yes, you can do that. As long as you wire the receptacle properly. – Speedy Petey Jul 19 '14 at 2:25

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