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<div><font size="2" face="Tahoma">Hi All,</font></div>
<div><font size="2"></font> </div>
<div><font size="2">I think it is clear that a fused disconnect is required next to the service tap. But I have one other thought. </font></div>
<div><font size="2"></font> </div>
<div><font size="2">When we install line side taps we always run the wire between the disconnect and service panel in rigid conduit and bond both sides of the conduit just like we would do with service wires. This is a requirement in San Francisco and come
to think of it I haven't looked deep enough into the code to see if it is an actual NEC requirement or not. Thoughts?</font></div>
<div><font size="2"></font> </div>
<div><font size="2">-August</font></div>
<div><font size="2" face="Tahoma"></font> </div>
<div><font size="2" face="Tahoma">August Goers</font></div>
<div><font size="2" face="tahoma"></font> </div>
<div><font size="2" face="tahoma"></font> </div>
<div><font size="2" face="tahoma">Luminalt Energy Corporation</font></div>
<div><font size="2" face="tahoma">O: 415.564.7652</font></div>
<div><font size="2" face="tahoma">M: 415.559.1525</font></div>
<div><font size="2" face="tahoma">F: 650.244.9167</font></div>
<div><font size="2" face="tahoma"><a href="http://www.luminalt.com/">www.luminalt.com</a></font></div>
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<font color="#000000" size="2" face="Tahoma"><b>From:</b> re-wrenches-bounces@lists.re-wrenches.org [re-wrenches-bounces@lists.re-wrenches.org] On Behalf Of Bill Brooks [billbrooks7@yahoo.com]<br>
<b>Sent:</b> Sunday, March 28, 2010 10:04 PM<br>
<b>To:</b> 'RE-wrenches'<br>
<b>Subject:</b> Re: [RE-wrenches] Supply Side Tap Overcurrent Protection<br>
</font><br>
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<p class="MsoNormal"><span style="COLOR: #1f497d">Dave,</span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d"></span> </p>
<p class="MsoNormal"><span style="COLOR: #1f497d">All line side connections must have overcurrent protection (230.91) at the disconnecting means. Article 230.70 through 230.95 is what generally governs these connections. Without rewriting John Wiles’ articles
on this subject, here are a few quick pointers.</span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d"></span> </p>
<p class="MsoNormal"><span style="COLOR: #1f497d">The basic rule to remember, since you don’t have your code book, is to install a disconnecting means with overcurrent protection adjacent to the existing service. No specific distance is given, but the implication,
and the field experience is as close as physically possible to the existing service disconnecting means. Circuit breakers or fused disconnects are allowed if they are listed as service equipment. Fused disconnects are used more often than circuit breakers
since many utilities require a visible-break switch.</span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d"></span> </p>
<p class="MsoNormal"><span style="COLOR: #1f497d">To give Xantrex the benefit of the doubt, their manual probably was not intended to address line side connections. If it is intended to cover these, there statement may be accepted by some jurisdictions, but
it quite unlikely that a jurisdiction would ever allow it. To have line side conductors, with no disconnecting means, installed into a PV inverter wiring center just doesn’t make sense. Always install a service disconnect with overcurrent protection on every
connection to service conductors—that seems like a logical and simple rule that can never go wrong.</span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d"></span> </p>
<p class="MsoNormal"><span style="COLOR: #1f497d">Bill.</span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d"></span> </p>
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<p class="MsoNormal"><b><span style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">From:</span></b><span style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt"> re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org]
<b>On Behalf Of </b>Dave Palumbo<br>
<b>Sent:</b> Sunday, March 28, 2010 10:53 AM<br>
<b>To:</b> 'Wrench List'<br>
<b>Subject:</b> Re: [RE-wrenches] Supply Side Tap Overcurrent Protection</span></p>
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<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt">Wrenches,</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"></span> </p>
<p class="MsoNormal"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt">I am tasked with reviewing an installation by a licensed electrician in Vermont and would like help with the following:</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"></span> </p>
<p class="MsoNormal"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt">Grid-tied PV system with battery back-up. AC point of connection is a supply side tap (done on customer side of utility meter ) then traveling 5 feet of #2 THHWN in 1”
EMT to the 60 Amp 240vac Lockable Utility Disconnect (unfused) and continuing 15 feet #2 THHWN 1” EMT to Xantrex XW 60 Amp breaker.
</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"></span> </p>
<p class="MsoNormal"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt">I had said that the 60amp 240vac lockable disconnect needed to be fused, and received the following reply from the installing electrician.<i></i></span></p>
<p class="MsoNormal"><i><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"></span></i> </p>
<p class="MsoNormal"><i><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><< “The Xantrex XW Power Distribution Panel contains the required over current protection (60 amp</span></i></p>
<p class="MsoNormal"><i><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt">double pole circuit breaker) negating the need for a redundant fuse at the Utility Disconnect switch.” >></span></i></p>
<p class="MsoNormal"><i><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"></span></i> </p>
<p class="MsoNormal"><span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt">I am on a short trip in Florida and away from my code books. Can someone provide guidance and code reference please? I am concerned about the 20 foot distance of the
un-protected circuit from the supply side tap and also the interrupt rating of the 60 Amp breaker in the Xantrex distribution panel.</span></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">David Palumbo</p>
<p class="MsoNormal">Independent Power LLC</p>
<p class="MsoNormal">Offices in Lamoille and the Champlain Valley</p>
<p class="MsoNormal">802.888.7194 </p>
<p class="MsoNormal">www.independentpowerllc.com </p>
<p class="MsoNormal"> </p>
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