Re: L5-30 wire for 220V?
The 208 wye makes sense. Thanks Marlow
This might help...
View attachment 1347View attachment 1348
And to answer your question which I failed to above - with two hots and a ground you can safely get 240/208. With one hot, neutral and ground you can safely get 120. With two hots, one ground and one neutral, you can get both 240/208 and 120. Range plugs do this because the oven element is 240 but the top elements and electronics are 120, so both are needed. They are also useful for power distribution (ie CS/L14-30/etc) because you can have either. In short, with no neutral, there is no safe way to get 120.
The 208 wye makes sense. Thanks Marlow