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nuckolls.bob(at)aeroelect
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 Posted: Wed Nov 15, 2023 9:40 am Post subject: bad fuses |
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Received my amazon order of 'cheap fuses'. Don't have time
to gather fine-grained data right now but just for grins:
Connected a 2A fuse directly across a CV/CC power supply
set up for 24v (at) 5A. Turned on power supply and got tired
of waiting for the fuse to blow after a minute or so.
Increased to 10A and repeated test. Took video of the
results. Fuse blew in ~400 milliseconds. Okay,
would we wire a 2A circuit with anything less that
22AWG? I wouldn't. I demonstrated 22AWG ability
to carry 20A for an indefinite interval without
putting the insulation at risk.
http://aeroelectric.com/Pictures/Wire/22AWG_20A.pdf
Yeah, this fuse is a bit more robust than a
name-brand device . . . but would it put a 22AWG
feeder at risk?
Need to build some instrumentation support shelves
over the workbench before I can set up a really
good examination of these devices.
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
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Voyager
Joined: 30 Jun 2020
Posts: 77
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| Posted: Wed Nov 15, 2023 2:10 pm Post subject: bad fuses |
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Yes, one wire in room temp air will carry a fair bit of current. However, bundle a few wires at 12,000 feet and the capacity will be a fair bit less.
It is good the fuse blew at 10 A. I have seen videos of 2 A Chinese fuses that carried 30 A for a fair bit of time.
Some Chinese fuses MAY protect wire adequately, but in my airplane I want fuses that WILL protect my wires adequately.
Matt
Sent from my iPad
| Quote: | On Nov 15, 2023, at 12:42 PM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com> wrote:
 Received my amazon order of 'cheap fuses'. Don't have time
to gather fine-grained data right now but just for grins:
Connected a 2A fuse directly across a CV/CC power supply
set up for 24v (at) 5A. Turned on power supply and got tired
of waiting for the fuse to blow after a minute or so.
Increased to 10A and repeated test. Took video of the
results. Fuse blew in ~400 milliseconds. Okay,
would we wire a 2A circuit with anything less that
22AWG? I wouldn't. I demonstrated 22AWG ability
to carry 20A for an indefinite interval without
putting the insulation at risk.
http://aeroelectric.com/Pictures/Wire/22AWG_20A.pdf
Yeah, this fuse is a bit more robust than a
name-brand device . . . but would it put a 22AWG
feeder at risk?
Need to build some instrumentation support shelves
over the workbench before I can set up a really
good examination of these devices.
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
|
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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