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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