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Same rating for fuses and circuit breakers?

 
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nuckolls.bob(at)aeroelect
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PostPosted: Tue Oct 23, 2018 1:36 pm    Post subject: Same rating for fuses and circuit breakers? Reply with quote

At 02:44 PM 10/23/2018, you wrote:
Quote:
I'll jump in, because that's one of my pet peeves. First, the mfgr of a
widget shouldn't be asking the end user to supply protection for their device.

Right on!



Bob . . .


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nuckolls.bob(at)aeroelect
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PostPosted: Tue Oct 23, 2018 1:57 pm    Post subject: Same rating for fuses and circuit breakers? Reply with quote

At 03:49 PM 10/23/2018, you wrote:
Quote:
--> AeroElectric-List message posted by: Kelly McMullen <kellym(at)aviating.com>

I seem to recall there is a reason that ammeters call for a 1 amp fuse on each lead from the shunt. It certainly isn't for wire protection, maybe to protect the meter movement


Yeah, first saw them do that on the 336/337 series
airplanes at the Pawnee plant. That was the
idea . . . but the fusing constant for a AGC1
(then a 3AG1) was such that a 5A flow of current
would take about 30 milliseconds to pop the fuse.
That 1 mA meter movement would be in trouble
a lot faster than that!

Don't know if anyone tested that decision
in the lab. There were some 50mV instruments
with lower resistance (maybe 10mA?). The
1 ohm fuse has about 200 mOhms of resistance.
Two fuses in series at 10 mA gives you a 4 mV
drop at full scale . . .

But I don't think anyone really paid much
attention to the readings anyhow . . . ammeters
are not really useful flight instruments.



Bob . . .


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nuckolls.bob(at)aeroelect
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PostPosted: Wed Oct 24, 2018 4:46 am    Post subject: Same rating for fuses and circuit breakers? Reply with quote

At 09:11 PM 10/23/2018, you wrote:
Quote:
--> AeroElectric-List message posted by: Dick Tasker <dick(at)thetaskerfamily.com>

To use when you get to your destination when you troubleshoot the problem.

Dick Tasker

Yup . . . keep 'em in the toolbox.



Bob . . .


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