WESTERN UNION SPLICE FREE

It is fine as it is for us g-jobbers.ĭoes that bug in the drawing really matter that much? Consider that a NASA or military SOP (standard operating procedure) may include or reference a picture or diagram similar to the one above for use by factory assembly staff and test/repair technicians. The direction of the wrap defies logic and physics unless you are like me, an admirer of art of M.C. There is a problem in your diagram at the far right end of the wire on the final twist. The example is good and it demonstrates a very strong splice. It’s less the tension, but the inevitable vibration that will slowly kill it.īut then, I’m thinking in the mindset of the “it must not fail” school of engineering here.

So that only works if you’ve got either strain relief or no real strain in the first place (neither seems likely if you’re needing to use this splice). You can tin a stranded cable into a solid unit to avoid that at the splice, but you still have a solder interface farther away. Solid core is more resistant to that, if properly sized with reason. That said, I wouldn’t recommend using stranded in this application, for several reasons, but the one that leaps to the top is that a soldered connection subject to any sort of twisting or vibration will fatigue the strands at the end of the solder, leading to failure. I think you could use this splice if you had to with stranded, particularly if you make sure to twist the strands in the right direction (so they don’t loosen under tension). There’s a whole category of when to use solid or stranded wire. This material comes from page 84 of NASA-STD 8739.4 (PDF), which is a great reference if you’re interested in best practices for interconnecting cables and wires. The solder shall fillet between connection elements over the complete periphery.Solder shall wet all elements of the connection.Though the Lineman’s splice was originally used without solder, today soldering is common. Conductors shall not overlap the insulation of the other wire.The wraps shall not overlap and the ends of the wrap shall be trimmed flush prior to soldering to prevent protruding ends.There shall be at least 3 turns around each conductor and the wraps shall be tight with no gaps between adjacent turns.To wit, in a NASA-approved Lineman’s splice: In any case, it is a time-proven method, and, coolest of all, one of NASA’s Required Workmanship Standards. It is commonly claimed that, properly made, a Lineman’s splice is stronger than the wires of which it is composed. Some commenters on my post about using a washer as a soldering aid noticed my sloppy splicing technique and were kind enough to educate me about the so-called “Western Union splice,” aka the “Lineman’s splice,” which is the preferred method for twisting solid-core wire leads together for inline electrical connections.ĭeveloped during the heyday of the telegraph, the Lineman’s splice is designed for connections that will be under tension. Graphics and More to Help Spread the Word

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WESTERN UNION SPLICE FREE

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Western union splice