Hi Dave,

Can you point me to a reference for that? I just looked at my copy of
the US National Electrical Code (2005 version) and I can't find any
prohibition on multiple connections between the building grounding
system and earth ground. Perhaps you are thinking of connections
between neutral and ground, in which case I definitely agree that
there should be only one of those connections. I think that the poster
was suggesting merely that the oven case be connected to BOTH the
green wire from the outlet AND an earth ground rod directly. I don't
think this really does anything useful in this case (i.e., it is not
really an adequate protection against shock), I don't think it would
be harmful, either. If what you were saying were true, then RF
transmitting equipment which had a separate RF earth ground would have
to be chassis isolated from the building AC ground, which it usually
isn't in my experience.

Sean


On Fri, Dec 11, 2009 at 3:33 PM, Dave Tweed <pic@dtweed.com> wrote:
> YES NOPE9 wrote:
>> However you choose to use the oven, you may want to ground the metal
>> frame work to earth ground as well as to electrical ground.
>
> No! That would be a code violation! At least, in the US.
>
> Electrical ground is supposed to be bonded to earth ground at exactly one
> point, usually at the service entrance or the first distribution panel.
>
> -- Dave Tweed
> --
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist