Ruh roh...  Ignore my previous.  A quick google revealed that perhaps you do have hot/hot/neutral with no ground.  I guess they did this a while back...





>
> From: David Hawkins <david.hawkins@STALWORTH.COM>
> Date: 2004/08/25 Wed PM 06:52:50 GMT
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [OT:] Wiring detached garage (reprise)
>
> Stealing your thread for a somewhat related question. I want to
> use a 220V 30A dryer outlet (no longer used since we have a gas
> dryer) for a subpanel in an _attached_ garage. I want 2x 120V 20A
> circuts for a table saw, air compressor, etc.  After turning off
> the breaker I removed the outlet and found H-H-N (no ground).
> Sounds like I might be outta luck.
>
> But my house is built on a concrete slab. I'm fairly certain
> that the wiring for this circuit in in conduit as opposed to
> UG type cable. I will verify this when I cut out the sheetrock.
> Would it be a bad idea and therefore unsafe to use the conduit
> for ground? Any idea if it would have been code in Southern
> California in 1964 to require that the conduit be a reliable
> (low impedance) ground?
>
> Thanks,
> David
>
> > The point is, NEVER use the ground circuit for normal return
> > currents in place of the neutral circuit, which is what the
> > improper installation in effect does.   Ground circuits ideally
> > have low impedance to the system ground, but little to no normal
> > return current  flow (what should be neutral current in single
> > phase power circuit).
>
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