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nuckolls.bob(at)cox.net Guest
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Posted: Thu Apr 17, 2008 4:49 am Post subject: "Chubby" wires and fuseblocks |
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Quote: | Comments/Questions: I dont' undestand how to connect large current loads
to FASTON fuse blocks.
Max wire into FASTON seems to be #10
Fuses up 30A are sold by B&C
Most #10 wire is not rated for 30A.
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I don't know of any #10 wire that is not rated for
30A in airplanes.
Quote: | What am I missing?
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I don't recommend any fuses beyond 14AWG/15A be used
in the fuse blocks. What systems are you wiring
that demand the use of larger wire/fuses?
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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nuckolls.bob(at)cox.net Guest
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Posted: Fri Apr 18, 2008 5:55 am Post subject: "Chubby" wires and fuseblocks |
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Quote: | Comments/Questions: I dont' undestand how to connect large current loads
to FASTON fuse blocks.
Max wire into FASTON seems to be #10
Fuses up 30A are sold by B&C
Most #10 wire is not rated for 30A.
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I don't know of any #10 wire that is not rated for
30A in airplanes.
Quote: | What am I missing?
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I don't recommend any fuses beyond 14AWG/15A be used
in the fuse blocks. What systems are you wiring
that demand the use of larger wire/fuses?
At 07:15 AM 4/17/2008 -0700, you wrote:
Quote: | That's not the question. I want to understand the "faston technology" Why
does
Tyco et. el. make fuses that apparently are larger than the wire they are
designed to protect?
Thanks
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I'm not sure I understand the question. Tyco doesn't make
fuses. Bussmann, Littlefuse, and contemporaries do. Neither
one makes wire. It's the system designer's task to consider
suitability of each component to the task based on manufacturer's
specifications and their own experience bolstered perhaps by
in-house testing.
Selection of components for assembling into a system is
usually accomplished by "erring on the safe side." E.g.,
de-rating the devices such that no combination of environmental
conditions put any component at risk. This is the foundation
for my recommendation that we not use anything larger than 15A
fuses in the fuse blocks contrary to the manufacturer's ratings
of 30A combined with Bussmann's willingness to supply a 30A
fuse that fits the hole in a fuse block they designed.
At the same time, 10AWG wire is generally good for 30A
in all but the warmest environments and cheesiest insulation.
If design goals for a design drive us to push a combination
of components out to the boundaries of their performance limits,
then designers are obligated to do a lot of analysis and
probably testing to confirm that analysis. In most cases,
the qualification effort for an optimized design far exceeds
value received for the finished product.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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