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If such a receptacle exists, what is the (US) NEMA designation for a 250V receptacle with a terminal on the back for hot#1, and one for hot#2, a ground terminal, and also a place to attach neutral, where the receptacle is prong-compatible with an L6-20P plug? And are such receptacles available with GFCI protection? Or is neutral not needed/available?

mr blint
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NEMA type 6 is for hot, hot, ground. Used for welders, heaters that do not require neutral.

If the device(comes with NEMA 6 plug) and you have a three wire cable plus ground, then you just cap/wire nut the neutral wire.

You want to look for NEMA L6-20R receptacle.

For devices using two hots, neutral and ground you look for NEMA type 14 plugs/receptacles.

crip659
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If such a receptacle exists, what is the (US) NEMA designation for a 250V receptacle with a terminal on the back for hot#1, and one for hot#2, a ground terminal, and also a place to attach neutral, where the receptacle is prong-compatible with an L6-20P plug?

No such thing exists. The NEMA L6-20 plug/socket specification excludes neutral. Many 240V loads do not need neutral. (A/C, water heater, EV charging, well, compressor, welder). If you ran cable w/ neutral to the socket box, then just cap off neutral when you wire the socket.

If you have an application that needs neutral (dryer, range, RV) ... then you need to use the NEMA 14 family sockets.

And are such receptacles available with GFCI protection?

Absolutely not. There is no 240V GFCI receptacle anywhere on the market*. If you need to provide GFCI protection to one, you'll have to learn more about how GFCI works (hint: it's NOT a receptacle, that's just a way that some GFCIs are packaged). You use a GFCI breaker for that, they're around US$100.

* Except for the Tesla or J1772 "Fetch" connector used for EV charging. The EV wall unit contains a smart GFCI. As such, a second dumb GFCI should not be used on hard-wired EV connections.

Harper - Reinstate Monica
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To answer the second part of the question I've never seen a 250V in-wall GFCI receptacle. Pretty sure they're not made. You need to use a GFCI Breaker or an expensive portable plug-in GFCI outlet.

jay613
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