Hi Jay, Yep, mersen and marathon brands, have similar fine strand DLO ratings on some of their power terminal blocks. I’ve used both types before as I recall.
I am traveling, but will try to post some spec sheets in the next few days. *Kirk Herander / **[email protected] <[email protected]>* *Owner|Principal, VT Solar, LLC* *Celebrating our 34st Anniversary 1991-2025!!* dba Vermont Solar Engineering 802.559.1225 On Wed, Sep 3, 2025 at 6:50 PM jay <[email protected]> wrote: > this got me curious. > > Here is the only picture I can find of anything rated for fine strand > distrubution block. > Notice it has an extension on the bottom of the compression screw. Which > I guess is keeping the find stands out of the threads. > > > Nothing else I can find says it’s rated from fine strand. > > Happy to be proven wrong. > > jay > > hubbell.com > <https://www.hubbell.com/burndy/en/products/bdblcs7r1dw-large-flex-rated-power-distribution-block/p/8517004> > [image: apple-touch-icon.png] > <https://www.hubbell.com/burndy/en/products/bdblcs7r1dw-large-flex-rated-power-distribution-block/p/8517004> > <https://www.hubbell.com/burndy/en/products/bdblcs7r1dw-large-flex-rated-power-distribution-block/p/8517004> > > > On Sep 3, 2025, at 3:56 PM, Kirk Herander <[email protected]> wrote: > > IMO, any OEM that recommends a ferrule does not use fine-strand rated > compression lugs in their equipment. > > Rated lugs do exist, they just don’t seem to be spec’ed by OEMs. > > I don’t like ferrules on battery cable and always use fine-stranded > compression PDBs when building custom battery combiners. > > > > > *Kirk Herander / **[email protected] <[email protected]>* > *Owner|Principal, VT Solar, LLC* > *Celebrating our 34st Anniversary 1991-2025!!* > dba Vermont Solar Engineering > 802.559.1225 > > > On Wed, Sep 3, 2025 at 5:38 PM jay via RE-wrenches < > [email protected]> wrote: > >> From my memory none of the compression lug style are rated for fine >> stand, at least without a ferrule. >> >> Because strands can get into the threads and bind, making it seam like >> its tight but its not. >> >> But I could be wrong >> >> >> On Sep 3, 2025, at 2:39 PM, Ray Walters via RE-wrenches < >> [email protected]> wrote: >> >> I've got to ask: Are none of the lugs on these Chinese inverters approved >> for fine strand cable? I just have not had a problem with that, but I've >> mostly used Magnum, Midnite, and Outback equipment over the years. What >> were the lugs on the old Trace DC 250 boxes? Were they fine strand rated? >> They sure were tough to get 4/0 into, as William mentioned. >> >> Ray >> Remote Solar >> On 9/3/2025 12:57 PM, Kent via RE-wrenches wrote: >> >> William, >> >> If the only reason the ferrule wouldn't fit after using the hex crimper >> was the ridge left where the dies meet, you could rotate the cable 120 >> degrees and crimp the ferrule again. >> >> I doubt that the indenter crimper will do a decent job with large >> ferrules. >> >> I do like your thin piece of copper solution. Not UL approved but I dare >> say wrench approved. >> Kent Osterberg >> Blue Mountain Solar >> >> >> On 9/2/2025 8:55 PM, William Miller via RE-wrenches wrote: >> >> Friends: >> >> >> Thank you for all of your input on this question. I feel it only right I >> report back how this turned out >> >> >> I tried a crimper like this: >> >> >> >> >> >> It left a jagged ridge on both sides of the ferrule where the dies met. >> >> >> The crimper below was suggested but I have not tried it: >> >> This was suggested but I have not tried it either: >> >> >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: [email protected] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/[email protected]/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: [email protected] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/[email protected]/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> >> >
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