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Jekyll
Joined: 22 Feb 2006
Posts: 44
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 Posted: Wed Feb 22, 2006 1:57 pm Post subject: Splicing strobe wires |
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When building my wings, I installed the strobe wires in a conduit and cut them off, leaving only a 2 foot length on the root end. That was before I started learning about wiring. Now I have to learn how to connect my installation. I'm using the Whelen system 6 in an RV-7A (3-wire shielded cable, single power supply.)
a. Can I splice the cables to extend them to the power supply? If I do, do I treat the shields as fourth wires and splice those also? If I do this, how do I splice the shield (solder or crimp)?
b. Do I install a molex with 4 pins, 1 for the shield, at the root bulkhead? (I guess this was my original concept when I cut the wires)
c. Should I replace the wires so I have an unbroken run to the power supply? I can probably pull a replacement through if need be.
I'm concerned about RMI from the cable. Whelen says to ground the shield only at the power supply.
Jekyll
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nuckollsr(at)cox.net
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| Posted: Wed Feb 22, 2006 6:20 pm Post subject: Splicing strobe wires |
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At 01:57 PM 2/22/2006 -0800, you wrote:
| Quote: |
When building my wings, I installed the strobe wires in a conduit and cut
them off, leaving only a 2 foot length on the root end. That was before I
started learning about wiring. Now I have to learn how to connect my
installation. I'm using the Whelen system 6 in an RV-7A (3-wire shielded
cable, single power supply.)
a. Can I splice the cables to extend them to the power supply?
|
Yes
| Quote: | If I do, do I treat the shields as fourth wires and splice those also?
|
Yes
| Quote: | If I do this, how do I splice the shield (solder or crimp)?
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Your choice.
| Quote: | b. Do I install a molex with 4 pins, 1 for the shield, at the root bulkhead?
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yes
| Quote: | (I guess this was my original concept when I cut the wires)
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no problem if you have no heartburn over the connector/
| Quote: | c. Should I replace the wires so I have an unbroken run to the power supply?
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no
| Quote: | I can probably pull a replacement through if need be.
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Not necessary
| Quote: | I'm concerned about RMI from the cable. Whelen says to ground the shield
only at the power supply.
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That's correct. Shielding breaks ELECTROSTATIC coupling of noise
and the few inches of exposed wiring at the connector location is
a microscopic risk. Open shields are not "leaks in the dam where
torrents of noise pour out."
Bob . . .
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
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Joemotis(at)aol.com
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| Posted: Wed Feb 22, 2006 6:53 pm Post subject: Splicing strobe wires |
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Thank you Bob, I have always wondered how significant the unsheilded molex
was in noise.
And as I guessed and you pointed out, it's nada.
Joe
do not archive
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