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Splicing strobe wires

 
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Jekyll



Joined: 22 Feb 2006
Posts: 44

PostPosted: Wed Feb 22, 2006 1:57 pm    Post subject: Splicing strobe wires Reply with 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? 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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PostPosted: Wed Feb 22, 2006 6:20 pm    Post subject: Splicing strobe wires Reply with quote

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)?

Your choice.
Quote:
b. Do I install a molex with 4 pins, 1 for the shield, at the root bulkhead?

yes

Quote:
(I guess this was my original concept when I cut the wires)

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?

no

Quote:
I can probably pull a replacement through if need be.

Not necessary
Quote:
I'm concerned about RMI from the cable. Whelen says to ground the shield
only at the power supply.

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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PostPosted: Wed Feb 22, 2006 6:53 pm    Post subject: Splicing strobe wires Reply with quote

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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