High Leg

[mivey]

It's not a twist-lock unless there's an L in the number, such as L6-20R.

http://www.systemconnection.com/downloads/PDFs/NEMAPlugReceptacleConfigurations.pdf

http://www.nooutage.com/nema_configurations.htm

The actual spec was for a "P", not "R", if you want to be picky. It was a plug so 6-20P ("P" for plug). Either way, it was not specifying line-neutral.

P is for plug, R for receptacle, L for locking, ML for midget locking, FSL (?Frequency-differentiated Special Locking?), SS for ship-to-shore, TT for travel trailer

You can download the NEMA WD-6 for free here:
http://www.nema.org/stds/wd6.cfm#download

 

[infinity]

The spec sheet also says it can operate at 220V so he may just want to use a 2-pole breaker across legs A-C if all he has available is a wild leg system.

Are you saying that it would make a difference if you used any two phases?

A-B,or B-C, or A-C

 

[Mr. Bill]

Practically, no it would not make a difference which two phases were connected. But since a wild leg has a larger Utility transformer capacity on the A & C legs I just prefer to add load to these legs if I have a choice and the load is not 3-phase.