I agree with Gary, but the quality depends on wire type and match between wire and crimp.
Also the tool quality (if the right tool is used at all) is essential. Crimps are suitable for stranded wire only, and the wire need to be inserted far enough. Crimps are subject to a number of failure causes, and I have seen many wires come out of a crimp connector without force. Not all safety critical parts have full compatible flat 6.3 mm terminals, the retention hole is missing or adapted so as to allow wires be soldered into. Manufacturers of crimp terminals often fail to provide decent assembly and safety instructions with their products leaving ample space to for misfits.... There is also no (safety) convention on where to select what type of terminal, be it ring, fork or pin or connector type, so the component applied determines the choice of type, not necessarily leading to a safe solution. This is the more true as component manufacturers provide safety-approved and non-approved types of the same component, mostly at a better price, differing only a type of connection. I have seen pin type of crimp connectors used at a screwed power supply terminal (mains side), and I fail to see the added value of the double crimp action in that case. If the screw comes loose then... I have seen no safety standard explicitly refusing shrinked connections within the restrictions Rich mentioned. Interesting question on heat shrinks is there possible qualification as an insulator..... ?? Gert Gremmen Ce-test From: Gary McInturff [mailto:gary.mcintu...@esterline.com] Sent: Tuesday 10 March 2015 20:14 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Shrink-wrap on soldered connections I've seen the same, although I generally use double crimp wire connections even on the smaller gauge wires. One crimp obviously attaches to the copper conductor the other crimp attaches to the wire insulation. Both Crimps are made with the same tool in the same crimping action. I suppose there is a small cost difference in the piece part, but it's a better, in my opinion, method for providing a secure double connection mac From: Richard Nute [mailto:ri...@ieee.org] Sent: Tuesday, March 10, 2015 11:53 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Shrink-wrap on soldered connections Hi Charlie: On certified products, I have seen shrink-wrap holding soldered connections in place. The shrink-wrap must attached to both the wire and some other "thing" that holds the wire in place should the solder connection fail. I have seen the shrink wrap covering both the solder joint and the terminal such that the terminal is the other "thing" that holds the wire in place. The issue is that if the solder joint fails, the wire can contact some other potential that would create a dangerous situation. I have seen cabling used for this purpose. Note that the solder joint itself must be mechanically secure prior to soldering. 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