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philo

On 11/15/2016 08:14 AM, wrote:
On Tue, 15 Nov 2016 05:23:07 -0800 (PST), wrote:

If the old wiring is in conduit(metal), I
have seen the conduit itself used as
the ground for the new three-holers.

I'm not sure what code has to say about
that.

Conduit has always been legal for grounding, but it has to be connected
properly.

Correct. It is legal and code to due so, but I have seen so many
instances where the fittings come apart...usually due to jarring....that
when I wire anything with conduit I also use a bare copper wire inside
as an additional ground.

I had one connection where the conduit was physically intact but through
the years oxidized and gave a less than satisfactory ground of several
ohms. It might still have been safe but obviously I re-did it and made
sure all the grounds in my house were approx .1 ohms or so