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nuckolls.bob(at)cox.net
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 Posted: Thu Oct 11, 2007 5:05 am Post subject: Fusible Link - is length of wire a concern? |
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At 12:12 PM 10/10/2007 -0700, you wrote:
| Quote: |
And another question 
Question: is there a suggested maximum wire length used when incorporating
fusible links in a system? (or threshold for switching to something else?)
Background: I am building a Z-19 system for my pusher aircraft. The
important electrical components are all in the rear of the aircraft near
the engine. This includes the Main Power bus and Ammeter shunt. The Master
switch and Ammeter are located up front on the panel, being separated by
about 10' of wire length in both cases.
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Fuses, breakers, fusible links are all "weak links in a chain"
intended to provide orderly, low maintenance, predictable
failure of an "overloaded chain" that minimizes damage to the system.
It matters not how long that chain is.
| Quote: | I am wondering if that is too far to run the fusible link wire from the
Main power bus to the Master switch. Same concern for the shunt to ammeter
fusible links.
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You lost me. "Fusible link wire?" If an when fusible
links are practical, the fusible link wire is but a
few inches long and enclosed in a material that minimizes
risks to adjacent wires if that particular piece of wire
burns. I'm also wondering about a protected wire that runs
from "main power bus to the master switch", are you speaking
of the fat wire that runs from the battery contactor to the
main bus fuse block or breakers? This wire doesn't get
protection, fusible link or otherwise. Fusible links are
not recommended in any locations other than those depicted
in the Z-figures and then only for relatively small wires.
Bob . . .
----------------------------------------
( "Problems are the price of progress. )
( Don't bring me anything but trouble. )
( Good news weakens me." )
( -Charles F. Kettering- )
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mikefapex
Joined: 05 Jul 2007
Posts: 70
Location: Colorado
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| Posted: Thu Oct 11, 2007 6:17 am Post subject: Re: Fusible Link - is length of wire a concern? |
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Bob,
You answered: >>
You lost me. "Fusible link wire?" If an when fusible
links are practical, the fusible link wire is but a
few inches long and enclosed in a material that minimizes
risks to adjacent wires if that particular piece of wire
burns.
<<
Sorry for the cornfusion, you did answer my question. Yes I am talking about the small 18/22 wire that connects the Main bus with the master switch. I was concerned that there was some length (small fusible section + rest of wire) in which a fusible link being used became 'too long' for such a tool . I understand now that is not the case in our aircraft applications. Or at least in mine.
Thank you,
Mike
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