As I'm sure you are aware, this has been pointed out by numerous people
in numerous threads. It is incredible how someone could be so stupid to
say water pipe is not required to be an electrode. The code, as you
quote it, is absolutely clear.
You can use a single equipment grounding conductor for several
circuits as long as it is sized to the biggest one.
I have seen people run one #8 solid as a bus and use split bolts to
pick up grounding pigtails from the various circuits along the way.
The code is really pretty ambiguous about wiring methods when you are
adding an EGC to a circuit that doesn't have one. As long as you are
getting back to the main bonding jumper with your ground (the bus in
the panel) in a solidly connected way you should be OK.
I was more concerned with the possibility of having the grounds run to
to a junction box, then have a single ground come out of that and then
have THAT connect to the panel. I saw someone say that the NEC for
this type of retrofit implies that each ground has to make a home run?
The other thing is that someone brought up something about creating a
magnetic loop (not sure if that is correct term) and implied that
could be a big problem in that it would raise resistance in the
You can run one EGC to several boxes and it can be a long bus, a star
configuration or any combination. You only have to be sure the ground
wire is big enough to serve the biggest circuit you are dealing with
and that it is protected from physical damage.
I would not get to worried about ground loops and such in a
residential equipment grounding system.. It is mostly hype anyway. We
fixed most surge problems by adding more bonding, possibly creating
loops and never fixed anything by getting anal with "star grounding".
(based on 20 years of computer and lightning protection experience in
On Sun, 23 Sep 2007 23:00:01 -0400, email@example.com wrote:
One way you can accopmplish this would be to run a 12-2/wg to the new
dedicated computer circuit, put a J box in this circuit in the
crawlspace and tap off that 12ga grounding conductor to ground any
other 15 or 20a circuit you want.
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