nuckolls.bob(at)aeroelect
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 Posted: Tue Aug 18, 2015 4:06 pm Post subject: The legacy "6-inch rule" |
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At 04:51 PM 8/18/2015, you wrote:
| Quote: | Bob,
On drawing 001-510, the Alternator ANL fuse and 2amp fuse are noted as to be located 6” or less from the starter contactor. Why is this? Are there any concerns to extending that length? If the length can be extended, by how much could one extend it? |
There is a legacy rule-of-thumb in TC aircraft
that says it's okay to 'sacrifice' as much as
6" of wire in an unprotected hard-fault. A number
of devices got hooked to Cessna busses back in the
60-70 time frame with no specific protection for
wires because they were close. i.e. the at-risk
wire was 6" or less.
In honor of that rule-of-thumb, we try to put
circuit protection as close as practical to the
source of energy that's going to burn the wire.
Given that 99.99+ percent of all circuit protection
in airplanes goes the lifetime of the vehicle without
having been called upon to protect wires, then
the 'risk' for going beyond the 6" rule is
vanishingly small . . .
Also, suggest you look into stocking the mini-anl style
limiters. MUCH less expensive, much more compact.
Bob . . . [quote][b]
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