I have to put in two 240v 30a outlets, and plugs.
Is there a difference between 10-30 and 6-30? My limited understanding is
that 10-30 has a neutral and 6-30 has a ground, and since my application has
a ground, 6-30 should be correct, but does it really matter since I am doing
it all from scratch? HD has the 10-30 cheaper, and they don't even have
6-30 plugs. (my dryer circuit has an "uninsulated neutral", which I would
have called a ground...)
If these are dedicated outlets, I think you can use whatever you want. Go
crazy and use a 30A twistlock. If they are branch circuit outlets that
anything might get plugged into (unusual > 20A), use the right NEMA pattern
-- you can buy the right ones at a better hardware store, or an electrical
supply house, or maybe at Fleet farm near the welders.
If you have the equipment that will be plugged into the receptacles, then
just match the plug. If you will be making up your own I suggest a four
wire outlet (14-30R or the L14-30R twistlock) as that will provide you with
a neutral and a grounding conductor giving you versatility for the future.
Of course you will need four wires for this (2 hots, 1 neutral, and one
The 10-30 is an outdated receptacle for retrofits. All new receptacles
require a ground.
If you only have 3 wires to a dryer plug it is a neutral, using the
WWII era exception. In 1996 the NFPA dercided "the war was over" (Phil
Simmonds exact language in the ROP) and you need 4 wires from then on.
Old installations are grandfathered but be sure your dryer is set up 3
wire (frame and neutral bonded)
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