<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML xmlns="http://www.w3.org/TR/REC-html40" xmlns:v =
"urn:schemas-microsoft-com:vml" xmlns:o =
"urn:schemas-microsoft-com:office:office" xmlns:w =
"urn:schemas-microsoft-com:office:word" xmlns:m =
"http://schemas.microsoft.com/office/2004/12/omml"><HEAD><TITLE>Two Buildings, Two Services, One Roof</TITLE>
<META http-equiv=Content-Type content="text/html; charset=us-ascii">
<META content="MSHTML 6.00.6000.17095" name=GENERATOR>
<STYLE>@font-face {
font-family: Calibri;
}
@font-face {
font-family: Tahoma;
}
@font-face {
font-family: Century Gothic;
}
@page WordSection1 {size: 8.5in 11.0in; margin: 1.0in 1.0in 1.0in 1.0in; }
P.MsoNormal {
FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman","serif"
}
LI.MsoNormal {
FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman","serif"
}
DIV.MsoNormal {
FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman","serif"
}
A:link {
COLOR: blue; TEXT-DECORATION: underline; mso-style-priority: 99
}
SPAN.MsoHyperlink {
COLOR: blue; TEXT-DECORATION: underline; mso-style-priority: 99
}
A:visited {
COLOR: purple; TEXT-DECORATION: underline; mso-style-priority: 99
}
SPAN.MsoHyperlinkFollowed {
COLOR: purple; TEXT-DECORATION: underline; mso-style-priority: 99
}
P {
FONT-SIZE: 12pt; MARGIN-LEFT: 0in; MARGIN-RIGHT: 0in; FONT-FAMILY: "Times New Roman","serif"; mso-style-priority: 99; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto
}
SPAN.EmailStyle18 {
COLOR: #1f497d; FONT-FAMILY: "Calibri","sans-serif"; mso-style-type: personal
}
SPAN.EmailStyle19 {
FONT-WEIGHT: normal; COLOR: windowtext; FONT-STYLE: normal; FONT-FAMILY: "Century Gothic","sans-serif"; TEXT-DECORATION: none; mso-style-type: personal-reply
}
.MsoChpDefault {
FONT-SIZE: 10pt; mso-style-type: export-only
}
DIV.WordSection1 {
page: WordSection1
}
</STYLE>
<!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></HEAD>
<BODY lang=EN-US vLink=purple link=blue>
<DIV dir=ltr align=left><SPAN class=702225021-18042011><FONT face=Arial
color=#0000ff size=2>I don't think you'll find anything in the NEC to prohibit
that. NEC 250.52(A)(1) requires you to bond a metal underground water pipe (if
it exists) to the grounding electrode system. In older neighborhoods with
metal water pipes, the grounding electrode systems for all the houses are bonded
together (through the metal water pipe). The only potential problem I know of
with the GECs for multiple services bonded together in this way is that if a bad
connection develops on the incoming grounded service conductor (neutral),
unbalanced (neutral) current can start flowing through the pipes to
neighboring services and back to the transformer through their neutral wires.
Bottom line: call your AHJ, tell them what you plan to do, and ask them if they
have a problem with it. You should also check with the
utility.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=702225021-18042011><FONT face=Arial
color=#0000ff size=2></FONT></SPAN><SPAN class=702225021-18042011><FONT
face=Arial color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=702225021-18042011><FONT face=Arial
color=#0000ff size=2>Regards,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=702225021-18042011><FONT face=Arial
color=#0000ff size=2>-Hans</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=702225021-18042011><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV><FONT face=Arial color=#0000ff
size=2></FONT><FONT face=Arial color=#0000ff size=2></FONT><FONT face=Arial
color=#0000ff size=2></FONT><FONT face=Arial color=#0000ff size=2></FONT><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <B>On Behalf Of </B>Mark
Frye<BR><B>Sent:</B> Monday, April 18, 2011 2:05 PM<BR><B>To:</B>
'RE-wrenches'<BR><B>Subject:</B> Re: [RE-wrenches] Two Buildings, Two Services,
One Roof<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=937200321-18042011>Or another way to illustrate this
problem:</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=937200321-18042011></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=937200321-18042011>There is nothing in the Code that would stop me from
hauling out the old #6 and bonding my GEC to my next door neighbors GEC, if I
wanted to?</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=937200321-18042011></SPAN></FONT><BR><SPAN lang=en-us><FONT face=Arial
size=2>Mark Frye</FONT></SPAN> <BR><SPAN lang=en-us><FONT face=Arial
size=2>Berkeley Solar Electric Systems</FONT></SPAN> <BR><SPAN lang=en-us><FONT
face=Arial size=2>303 Redbud Way</FONT></SPAN> <BR><SPAN lang=en-us><FONT
face=Arial size=2>Nevada City, CA 95959</FONT></SPAN> <BR><SPAN
lang=en-us><FONT face=Arial size=2>(530) 401-8024</FONT></SPAN> <BR><SPAN
lang=en-us></SPAN><A href="http://www.berkeleysolar.com/"><SPAN
lang=en-us><U><FONT face=Arial color=#0000ff
size=2>www.berkeleysolar.com</FONT></U></SPAN></A><SPAN lang=en-us><FONT
face=Arial size=2> </FONT></SPAN> </DIV>
<DIV> </DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <B>On Behalf Of </B>Mark
Frye<BR><B>Sent:</B> Monday, April 18, 2011 2:00 PM<BR><B>To:</B>
'RE-wrenches'<BR><B>Subject:</B> Re: [RE-wrenches] Two Buildings, Two Services,
One Roof<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=406425420-18042011>Dana,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=406425420-18042011></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=406425420-18042011>Exactly, why not? I can't find anything in the Code
that says 'Thou shalt not make a connection between the grounding system of
two seperate services located on two seperate buildings."</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=406425420-18042011></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=406425420-18042011>But re your example in this case the PV for both
building will be located on only one of the two. </SPAN></FONT></DIV>
<DIV><SPAN lang=en-us><FONT face=Arial size=2></FONT></SPAN> </DIV>
<DIV><SPAN lang=en-us><FONT face=Arial size=2>Mark Frye</FONT></SPAN> <BR><SPAN
lang=en-us><FONT face=Arial size=2>Berkeley Solar Electric Systems</FONT></SPAN>
<BR><SPAN lang=en-us><FONT face=Arial size=2>303 Redbud Way</FONT></SPAN>
<BR><SPAN lang=en-us><FONT face=Arial size=2>Nevada City, CA
95959</FONT></SPAN> <BR><SPAN lang=en-us><FONT face=Arial size=2>(530)
401-8024</FONT></SPAN> <BR><SPAN lang=en-us></SPAN><A
href="http://www.berkeleysolar.com/"><SPAN lang=en-us><U><FONT face=Arial
color=#0000ff size=2>www.berkeleysolar.com</FONT></U></SPAN></A><SPAN
lang=en-us><FONT face=Arial size=2> </FONT></SPAN></DIV></BODY></HTML>