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I think 690.47 C 3 covers this in the new 2011 code. The info notes
1 & 2 also yield more clarification. As always confusion reins
until we get some actual interpretation from Bill Brooks or John
Wiles, as all of this was completely rewritten. Feel free to correct
me, any and everyone, but this is my humble interpretation:<br>
The E-panel provides the required combined AC & DC grounding
busbar (in note 1) Note 2 says you can use the existing premises
grounding system, and C(3) says the AC EGC can be combined with the
DC GEC and run back to the premises AC grounding busbar in the same
conduit as your AC conductors. <br>
I think the main thing to check here is that you have properly sized
the single combined conductor (AC EGC/ DC GEC) and that it is
unspliced from the E panel to the main AC grounding busbar, and
finally, that the existing AC GEC runs directly from that busbar to
the grounding electrode.<br>
Its pretty clear IMHO that you don't need to run a separate GEC all
the way back to the grounding electrode (unless you're not on 2011
code?)<br>
<br>
BTW, I usually sink a supplemental ground rod direct from the
E-panel for lightning protection ( and to satisfy 2008 code) but my
read is that is no longer required by 2011 code as 690.47 D was
deleted.<br>
I love how some folks act like you're going to burn the place down
if you don't absolutely follow current code, and a couple of years
later the code completely changes its mind, again, and again.....:)<br>
<br>
Ray Walters<br>
<br>
<br>
On 9/6/2011 1:59 PM, Aaron Mandelkorn wrote:
<blockquote
cite="mid:5BA4AEA5-DD2E-40B8-BADD-86F58E96C61A@gmail.com"
type="cite">Wrenches,
<div><br>
</div>
<div>Just installed a Magnum MS-PAE battery based system on an
E-Panel distribution box and my inspector seems to have an issue
with the grounding. He is saying that I must run an additional
GEC down to the ground rod because I am dealing with two
separate grounding systems. The DC and AC side of the grounding
system shares the same ground buss bar in the E-Panel so why
wouldn't a single GEC down to the ground rod suffice? The buss
bar is where the two systems get grounded together rather than
at the rod. The inspector is telling me to either dig up the
rod and run an additional GEC down to it or connect the
additional GEC to the existing with an irreversible splice. Am
I missing something here? This requirement just seem redundant
and wasteful. If I do have to make the correction I will be
going with the splicing option. Some advise on irreversible
splices would also be greatly appreciated. I can't seem to
source them locally and have never used them before. Thanks for
any help.
<div><br>
</div>
<div><br>
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