The Murphy Builders Site

hi all

wiring question, i have some fitting from B & C electrical for knife and
butt splicing wires together, my questions is if i don't use these or run
out what is proper way to splice two wires together, is it show in bingelus
books

thanx

mike#007

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Mike,

I'm no expert on plane wiring but. On regular equipment I
always saulder then cover with heat sink. you loose a bit of wire each
time you have to undo it but it will never come undone on it's own.

Brad (R195)

Sorry for the second response somehow the first on ended up
in Rebel Ramble





On 6/7/2005 11:06 AM, MJONES@HATCH.CA wrote to REBEL-BUILDERS:

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-> hi all
->
-> wiring question, i have some fitting from B & C electrical for knife and
-> butt splicing wires together, my questions is if i don't use these or run
-> out what is proper way to splice two wires together, is it show in bingelus
-> books
->
-> thanx
->
-> mike#007
->
-> ----------------------------------------------------------------------
->
-> NOTICE - This message is the property of HATCH. It may also be
-> confidential and/or privileged. If you are not the intended recipient
-> of this message you are hereby notified that you must not disseminate,
-> copy or take any action with respect to it.
->
-> If you have received this message in error please notify
-> HATCH immediately via mailto:MailAdmin@hatch.ca.





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The proper way to splice wires is with AMP butt splices (e.g. #320570). If
you plan on disconnecting them occasionally, use knife disconnects (#35762)
and covwer them with an insulating sleeve (e.g. heat shrink) after. Don't
use automotive terminals. The ones quoted have a support for the
insulation, so don't put all the stress on the conductors. You need a
special crimper that crimps the conductor part tight and the insulation not
so tight (you can find them for about $40). The crimper has a ratchet
action so that once you start the crimp, you can't release it until the
recommended pressure has been applied.

I know lots of AMEs use the Canadian Tire terminals, and have never seen one
of these crimpers, but believe me, they do a far better job.

Al





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Mike,
Aircraft quality terminals and splices are reliable as long as they are
crimped properly. The Mil guys solve that by using crimp tools that
won't release until the crimp is proper. It is not good practice to
splice a wire run if it can be avoided. Be sure any splice is not
subject to vibration that could fatigue the wire. If you elect to
solder be sure to use rosin core solder, not acid core. Be sure there
are no sharp wire strands to poke through the shrink tube.

Do not use auto store terminals/splices as they are of dubious quality.
AMP is first choice although I have cheated and used some plated marine
supply terminals. Suggest you use Tefzel insulated wire as well, again,
not auto store.
Ralph Baker



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