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| using ferrule to join two wires? |
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| madires:
--- Quote from: tooki on December 17, 2019, 04:42:25 pm ---As I understand it, the reason for ferrules is simply to prevent wayward strands from shorting adjacent terminals. --- End quote --- There are multiple reasons. One is to prevent single strands to break off when the wire is fastened with a screw. Another is to keep the strands together for optimal contact. When fastened with a screw some strands wont be caught by the screw and therefore won't make proper contact which causes burned terminals in high power applications. |
| Kalin:
They are much faster to work with than just the stripped stranded wires, also they make the connection much more secure in a screw terminal which makes it much safer working inside a control cabinet since the wires are much less likely to pull out accidentally when trying to trace one wire in a duct full of them. |
| thm_w:
--- Quote from: Berni on December 17, 2019, 01:50:14 pm ---I have used ferules for joining before, but yeah its not what ferules are intended for. The correct thing for splicing wires are these crimp butt splices: https://uk.rs-online.com/web/p/crimp-butt-splice-terminals/0534288A/ As a bonus they also are already insulated so no heatshrink needed. --- End quote --- Or uninsulated: https://www.aliexpress.com/item/32425525831.html Since the correct part uses much thicker metal, it would make me think that ferrules have inadequate metal thickness. But these use single point crimp vs. ferrule which may be say 4 or 6 "points". Trying it here between two thin wires, the ferrule is incredibly strong (ratchet crimp), I would trust it over a hand-crimped splice. Thicker wire might not be as good (due to the relative thickness difference with the larger butt splice crimps). Good test for someone with a force gauge. |
| Neomys Sapiens:
--- Quote from: tooki on December 17, 2019, 04:42:25 pm --- It’s telling that square and hex crimps aren’t used for crimp terminals. But single point ones are, as are four- and eight-point crimps, where a tube is crimped by 4 or 8 anvils which create only dimple-like indents (this is very common in military and aviation). And one certainly can get butt splices using that system. --- End quote --- Negative. For butt splices, cable lugs and blade terminals (insulated), the Mil/Aero-orescribed crimp is the same as everywhere. (M22520/5-01 with Die M22520/5-100 /101/102/103 or M22520/10-01 with Die M22520/10-100...10-104). I prefer to have them use uninsulated ones (B-.crimp) in that case, but on the industrial side only. |
| wraper:
--- Quote from: Kalin on December 17, 2019, 05:42:34 pm ---They are much faster to work with than just the stripped stranded wires, also they make the connection much more secure in a screw terminal which makes it much safer working inside a control cabinet since the wires are much less likely to pull out accidentally when trying to trace one wire in a duct full of them. --- End quote --- Not only that. Stranded wire likely will be held only by a few strands pressed by screw, the rest flapping loose. If current is high that will cause overheat and might even cause burning. |
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