At 10:34 AM 4/28/2015, alan.b.pearce@stfc.ac.uk wrote: >The best way of doing this is to use what is sometimes termed a=20 >'Jenkins Spring' - and I don't know the origin of the term or why it=20 >is called a spring. > >The two wires to be joined have bare untinned wires laid side by=20 >side and a strand of suitable gauge wire is would around them to=20 >bind them together physically. Then solder is flowed into the joint=20 >to make a good joint. The joint is reliant on the strand of wire=20 >holding the two wires in firm physical contact before soldering. That is one of the splices that I was tested on when I went for my=20 IPC certification (Level 3S - equipment intended for use in outer=20 space). The big thing with this splice that is so hard to achieve is=20 that you are NOT allowed to have solder wick up under the insulation. >I am used to the ESA space soldering requirements, but these are=20 >essentially (initially) derived from NASA and US military=20 >requirements. Crimping and soldering (as described above) are both allowed= .. Yeah - we do work on down-hole stuff and anyone who touches that=20 equipment has to be to be certified to IPC Level 3S. Identical requirement= s. I'm guessing that you have MUCH more experience with this stuff than I do. dwayne --=20 Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .