<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Dave,<div>OK, here's my shot at this. Your mileage may vary. I think 240.86(A) applies here. Unless the CB in the Xantrex XW has a higher interrupt ratting (AIC) than the available fault current from that supply side tap and the CB is so marked (240.83(C), a disconnect using appropriate current limiting OCD devices is required. I've never done a supply side tap without the disco being fused with current limiting fuses, nor have I ever heard of one that wasn't current limit protected being approved.</div><div>Good Luck, Bob-O</div><div>ps you travel without your Code book? :)</div><div><br></div><div><br></div><div><div><div>On Mar 28, 2010, at 10:52 AM, Dave Palumbo wrote:</div><br class="Apple-interchange-newline"><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div lang="EN-US" link="blue" vlink="purple"><div class="Section1"><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-size: 12pt; font-family: 'Times New Roman', serif; ">Wrenches,<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-size: 12pt; font-family: 'Times New Roman', serif; ">I am tasked with reviewing an installation by a licensed electrician in Vermont and would like help with the following:<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-size: 12pt; font-family: 'Times New Roman', serif; ">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.<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-size: 12pt; font-family: 'Times New Roman', serif; ">I had said that the 60amp 240vac lockable disconnect needed to be fused, and received the following reply from the installing electrician.<i><o:p></o:p></i></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><i><span style="font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></span></i></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><i><span style="font-size: 12pt; font-family: 'Times New Roman', serif; "><< The Xantrex XW Power Distribution Panel contains the required over current protection (60 amp<o:p></o:p></span></i></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><i><span style="font-size: 12pt; font-family: 'Times New Roman', serif; ">double pole circuit breaker) negating the need for a redundant fuse at the Utility Disconnect switch. >><o:p></o:p></span></i></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><i><span style="font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></span></i></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-size: 12pt; font-family: 'Times New Roman', serif; ">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.<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; ">David Palumbo<o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; ">Independent Power LLC<o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; ">Offices in Lamoille and the Champlain Valley<o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; ">802.888.7194<o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><a href="http://www.independentpowerllc.com/" style="color: blue; text-decoration: underline; ">www.independentpowerllc.com</a><o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><font class="Apple-style-span" face="Helvetica"><span class="Apple-style-span" style="font-size: medium;"><font class="Apple-style-span" face="Calibri, sans-serif" size="4"><span class="Apple-style-span" style="font-size: 15px;"><br></span></font></span></font></div></div></div></span></div></div></body></html>