---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 07/15/15: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:15 PM - Insulation displacement connectors???? (Charlie England) 2. 03:58 PM - Re: Insulation displacement connectors???? (Bill Putney) 3. 06:27 PM - Re: Insulation displacement connectors???? (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 03:15:09 PM PST US Subject: AeroElectric-List: Insulation displacement connectors???? From: Charlie England Anyone know if any type of insulation displacement crimp connectors have ever been used in aircraft applications? I used hundreds (thousands?) of EA-7759 Plain B Wire Connectors, similar to http://www.ebay.com/itm/371364009928?rmvSB=true in burglar alarm & other data cable installations, & never have had a failed connection in 3 decades (though admittedly, I was stripping & twisting the wires prior to crimping). For those who haven't seen these, they have 'teeth' inside that pierce the insulation when crimped. I'm looking at the need to 'daisy chain' several signal grounds from a single dSub pin (in this case, an intercom), and these tiny connectors really look attractive to stagger the joints over several inches of wire near the pin. I tested one by opening the closed end with a pair of pliers, running the 'trunk' wire through the connector, inserting the 'branch' wire, and crimping (no wire stripping involved). Seems to work fine in penetrating the tefzel insulation, and I can't budge the wires with a manual tug test. I have no desire to do this for high current applications, but for signal wires, it sure makes an attractive package due to it's small size. Not sure about the type of insulation, but I'm pretty sure it won't spontaneously combust & drag the plane out of the sky. Thoughts? Charlie ________________________________ Message 2 _____________________________________ Time: 03:58:42 PM PST US From: Bill Putney Subject: Re: AeroElectric-List: Insulation displacement connectors???? Charlie, I know splicers use to love these things but even the telco's outlawed these in the 70's (i think). I'm surprised you can even find them on eBay. I guess you can use whatever you want to bet your life on in experimental but I'd stick with what's in common aeronautical use. Bill On 7/15/15 3:12 PM, Charlie England wrote: > Anyone know if any type of insulation displacement crimp connectors > have ever been used in aircraft applications? I used hundreds > (thousands?) of EA-7759 Plain B Wire Connectors, similar to > http://www.ebay.com/itm/371364009928?rmvSB=true > > in burglar alarm & other data cable installations, & never have had a > failed connection in 3 decades (though admittedly, I was stripping & > twisting the wires prior to crimping). For those who haven't seen > these, they have 'teeth' inside that pierce the insulation when crimped. > > I'm looking at the need to 'daisy chain' several signal grounds from a > single dSub pin (in this case, an intercom), and these tiny connectors > really look attractive to stagger the joints over several inches of > wire near the pin. I tested one by opening the closed end with a pair > of pliers, running the 'trunk' wire through the connector, inserting > the 'branch' wire, and crimping (no wire stripping involved). Seems to > work fine in penetrating the tefzel insulation, and I can't budge the > wires with a manual tug test. > > I have no desire to do this for high current applications, but for > signal wires, it sure makes an attractive package due to it's small > size. Not sure about the type of insulation, but I'm pretty sure it > won't spontaneously combust & drag the plane out of the sky. > > Thoughts? > > Charlie > * > > > * ________________________________ Message 3 _____________________________________ Time: 06:27:42 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Insulation displacement connectors???? At 05:12 PM 7/15/2015, you wrote: >Anyone know if any type of insulation >displacement crimp connectors have ever been >used in aircraft applications? I used hundreds >(thousands?) of EA-7759 Plain B Wire Connectors, similar to=C2 >http://www.ebay.com/itm/ 371364009928?rmvSB=true > >in burglar alarm & other data cable >installations, & never have had a failed >connection in 3 decades (though admittedly, I >was stripping & twisting the wires prior to >crimping). For those who haven't seen these, >they have 'teeth' inside that pierce the insulation when crimped Suggest you use bussed d-sub connectors http://tinyurl.com/nzm3e2f I've got some bussing boards available if you want them. 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