[RE-wrenches] Ferrules for large fine-stranded wire.

[Kent]

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:
>
> HYCLAT 10 Tons Hydraulic Crimping Tool Battery Cable Lug Terminal 
> Crimper with 9 Pairs of Dies, 12 AWG to 2/0 AWG Wire Crimping Tool
>
> 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:
>
> https://m.media-amazon.com/images/I/716TxXmojoL._SL1500_.jpg
>
> This was suggested but I have not tried it either:
>
> image0.png
>
> I had tried a similar crimper to the two above but it expanded the 
> width of the ferrule beyond what the lug would accept.
>
> Here is what several of you suggested:  Slip the ferrule over the 
> strands and insert it into the lug and let the set screw do the 
> crimping for you.  We tried this but the 4/0 ferrule when not crimped 
> would not fit into the battery lug on a fortress Envy 12.  The Envy 12 
> installation manual indicates a wire range of 1/0 to 3/0 and the 
> placard inside the wire compartment door says up to 4/0.  The lug 
> seems tight for 4/0.
>
> Here is what we did:  Back in the days of the Trace DC250 (maybe 
> 1988-ish) we had trouble wrangling all of the strands of a 
> fine-stranded 4/0 battery cable to all fit in the lug without a bunch 
> of strands poking out.  I found some thin (~35 gauge) copper sheet at 
> a local hobby shop.  I would clean and polish it shiny and cut a 
> little strip of the sheet slightly wider than the strip length and 
> long enough to wrap about 1-1/4 times around the strand.  I would wrap 
> it tightly around the strands and hold it temporarily in place with a 
> thin cable tie.  I bent the end of the sheet into a chamfered shape to 
> help guide the assembly into the lug.  After I got it started I would 
> snip the cable tie, fully insert the cable and tighten the set screw.  
> I never had one of these connections fail.  This is what we did on the 
> Envy 12 battery cables.
>
> The next day we removed all of the set screws and inspected the 
> connections.  They all looked great:  The copper sheeting had not 
> twisted, it had a nice, shapely dimple and, peaking up into the lug, 
> the cable looked to be well seated.
>
> I hope this feedback helps someone, someday.
>
> William
>
> Miller Solar
>
> 17395 Oak Road, Atascadero, CA 93422
>
> 805-438-5600
>
> www.millersolar.com <http://www.millersolar.com/>
>
> CA Lic. 773985
>
>
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