On Sun, 25 Jul 2010 08:30:42 -0500, Steve Barker
wrote:

On 7/25/2010 1:06 AM, Elmo wrote:
I just want advice for the conversion I just did before I plug it all in.

Details:
1. I have a two-phase 220V Sears Craftsman compressor which uses a 220 volt
plug with one blade sideways (otherwise it looks like a normal 120V
grounded plug).

2. I have no sockets in the house which fit that 220 volt plug.

3. I have a three-pronged dryer socket in the garage with 220 volts (two
hots and a neutral).

4. I just attached a new 3-pronged male dryer cord to a female 220 volt
plug with the one blade sideways.

Before I plug in the compressor to the recepticle to the dryer cord to the
recepticle, would you have any concerns about safety or other?

I assumed the neutral in the compressor plug was the center wire (looks
like a ground pin) while I assumed the neutral on the 3-pronged dryer cord
is the L-shaped center pin. Is that the correct assumption for the shared
neutral?

I'm suspecting that out of all these replies, NONE are correct. What i
suspect is that you have a 20a plug on a 120V compressor and you just
don't have any 20a 120v outlets in your house. Better look a little
closer at everything before you feed that unit 240v.
HOLD ON - I think Steve caught something I missed - you did say ONE
blare is crosswise, not 2 - right? That COULD BE a NEMA 5-20 plug. oR
IT COULD BE A 6-20.
BOTH crosswise would be a 6-15.

WHEN YOU HOLD THE PLUG WITH THE PINS FACING YOU AND THE "U" GROUND
DOWN, WHICH SIDE HAS THE "ROTATED" BLADE??
Rotated blade on the right os a 5-20 - 115 volt 20 amp. (nominal)
Rotated blade on the left is a 6-20 - 230 volt 20 amp (nominal).

If it is a Nema 6-20, go ahead you are OK (and I think you DID say it
was a 6-20R that you were using - which would not let a 5-20P fit)