<div dir="ltr">We use MC4 plugs to splice #10 wire inside j-boxes. You need a slightly larger (or longer) box, but you get a great, watertight connection, simple test points, easy string isolation, etc. And they are UL Listed for 1000 (or 1500) V.<div><br></div><div>I looked for years for UL listed (not just UL recognized) splice terminals, but all of the reasonably-priced DIN rail terminal block options seem to be made to go inside factory-assembled machines, and are UL recognized only. </div><div>Ilsco makes UL Listed PDBs, but they are larger, MUCH more expensive, and really not practical for splicing lots of 1:1 #10 wires. </div><div><br></div><div>(And yes, many inspectors around here are willing to die on the Listed-vs-Recognized hill...)</div><div><br></div><div>Blake</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Tue, Nov 11, 2025 at 1:16 PM William Miller via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto"><div><a href="https://www.grainger.com/product/MERSEN-Power-Distribution-Block-1-25CC04" target="_blank">https://www.grainger.com/product/MERSEN-Power-Distribution-Block-1-25CC04</a></div><div dir="auto"><br></div><div dir="auto"><br></div>I prefer terminals fastened in place and accessible tor testing. One option is above. <br clear="all"><br clear="all"><div><div dir="ltr" class="gmail_signature">Or:</div><div dir="ltr" class="gmail_signature"><br></div><div dir="ltr" class="gmail_signature"><div><a href="https://www.rexelusa.com/p/2986/allen-bradley/terminal-block-150a-1000v-ac-dc-gray-35mm-feed-through/662073058373/1492-j35" target="_blank">https://www.rexelusa.com/p/2986/allen-bradley/terminal-block-150a-1000v-ac-dc-gray-35mm-feed-through/662073058373/1492-j35</a></div><div dir="ltr" class="gmail_signature"><br></div><div dir="ltr" class="gmail_signature"><div><a href="https://www.phoenixcontact.com/en-us/products/multi-level-terminal-block-pttb-4-l-1000v-3062744" target="_blank">https://www.phoenixcontact.com/en-us/products/multi-level-terminal-block-pttb-4-l-1000v-3062744</a></div><br></div><div dir="ltr" class="gmail_signature"><br></div><div dir="ltr" class="gmail_signature">Or McMaster-Carr:</div><div dir="ltr" class="gmail_signature"><br></div><div dir="ltr" class="gmail_signature"><div><a href="https://www.mcmaster.com/product/7641K52" style="text-decoration:underline;font-family:helveticaneueetextpro-roman,arial,sans-serif;font-size:12px;font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;color:rgb(0,86,179)" target="_blank"><p style="margin:0px;font-size:12px;font-weight:400;line-height:18px;font-family:helveticaneueetextpro-roman,arial,sans-serif;color:rgb(102,102,102)">7641K52</p></a></div><br></div><br>William Miller<br>Miller Solar.com<br>805-438-5600<br><a href="http://www.millersolar.com" target="_blank">www.millersolar.com</a><br></div></div></div><div><br></div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Nov 11, 2025 at 10:15 AM Sam Haraldson via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Wrenches,<br><br>On the attached product spec sheet for Ideal Copper Crimps (aka Buchanan crimps) you'll see that max voltage for the crimp is rated at 600V but an asterisk indicates up to 1000V when "in fixtures and signs". In our application this is a 1000v system and we are joining pairs of #10 PV wires. The junctions are made in a rail-mounted, plastic j-box. We could not find the definition of "fixture" as it might pertain to this situation in the NEC and as such are interested to learn more about using Buchanan crimps for 1000V applications.<div><div><br></div><div><img src="cid:ii_mhuw288e1" alt="image.png" style="width: 811px; max-width: 100%;"><br></div><div><br></div><div>Cheers,</div><div>Sam<br> <div><div dir="ltr" class="gmail_signature"><div dir="ltr"><table cellpadding="0" cellspacing="0" style="font-family:Carlito,Tahoma,sans-serif"><tbody style="font-family:Carlito,Tahoma,sans-serif"><tr style="font-family:Carlito,Tahoma,sans-serif"><td style="padding:0px 10px 0px 0px;vertical-align:top;font-family:Carlito,Tahoma,sans-serif"><a href="https://onsiteenergyinc.com/" style="border:medium;font-family:Carlito,Tahoma,sans-serif" target="_blank"><img src="https://cdn.prod.website-files.com/675cb4f269e8da457106c938/67acde8cf274634235411bdd_email-sig-logo-onsite-energy.png" alt="OnSite Energy" align="top" width="95" height="95" style="display: block; font-family: Carlito, Tahoma, sans-serif;"></a></td><td style="padding:0px;vertical-align:top;font-family:Carlito,Tahoma,sans-serif"><table cellpadding="0" cellspacing="0" style="font-family:Carlito,Tahoma,sans-serif"><tbody style="font-family:Carlito,Tahoma,sans-serif"><tr style="font-family:Carlito,Tahoma,sans-serif"><td style="padding:0px 10px 0px 0px;vertical-align:bottom;font-family:Carlito,Tahoma,sans-serif"><div color="#514ca0" style="padding:0px;font-size:14pt;font-weight:600;text-transform:uppercase;font-family:Carlito,Tahoma,sans-serif;color:rgb(81,76,160)">Sam Haraldson</div><div color="#f9a145" style="padding:0px;font-size:11pt;font-family:Carlito,Tahoma,sans-serif;color:rgb(249,161,69)">Operations Specialist</div><div color="#514ca0" style="padding:0px;font-size:8pt;font-family:Carlito,Tahoma,sans-serif;color:rgb(81,76,160)">(406) 551-6135</div><div color="#514ca0" style="padding:0px;font-size:8pt;font-family:Carlito,Tahoma,sans-serif;color:rgb(81,76,160)"><a href="https://www.google.com/maps/search/1515+N.+Rouse+Ave+Bozeman,+MT+59715?entry=gmail&source=g" style="font-family:Carlito,Tahoma,sans-serif" target="_blank">1515 N. 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