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nuckolls.bob(at)aeroelect
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 Posted: Thu Jun 16, 2016 7:56 am Post subject: Review request for RV-9 Electrical System (G3X, GTN, etc |
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At 08:36 AM 6/16/2016, you wrote:
| Quote: | | One place on my Cessna I have found a breaker VERY useful is the 12v power port (aka Cigarette lighter). Sometimes items with too big a draw get plugged in and blow the breaker, remove item, reset, and can still use other items in flight. |
The factory stock 'cigar' lighter? Waaayyyy back when,
the folks at the factory decided it was better to call
them cigar lighters . . . seems that tobacco smoke
particulates were too fine to be captured by the
paper air filter for the vacuum driven instruments.
We were seeing early demise of gyros flown by
pilots who smoked while airborne . . .
Somebody got the idea that this problem might be
helped if we started calling them cigar lighters . . .
fatter smoke particles . . .
[img]cid:.0[/img]
In any case, your anecdote is the corollary to
outlets in your house where a branch circuit
is shared by other outlets with wildly variable
total loads. Too many hot-dog cookers, microwaves,
and pizza ovens plugged in at the same time
may pop a breaker.
Fuses and breakers intended to supply system
hardware should not be shared with any other
system . . . unless loss of ALL systems is
a low, acceptable risk condition. The founding
philosophy for bus structures with independently
protected feeders is ISOLATION between systems
such that no fault brings down more than the
affected system.
How much stuff do you plug into the cigar
lighter? On many Cessnas of the 1970 time frame
the cigar lighter was powered through a 20A fuse
and later a 10A breaker. 10A is a LOT of 'stuff'
to run from such a connector
[img]cid:.1[/img]
Bob . . .
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trigo(at)mail.telepac.pt
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| Posted: Thu Jun 16, 2016 8:26 am Post subject: Review request for RV-9 Electrical System (G3X, GTN, etc |
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Bob
With due respect, what William meant to say is that, against the anti-CB tendency of you and many people in this forum, he has found a particular circuit (the "cigar" lighter-type power port) where a circuit breaker is the preferred method (instead of a fuse)
Regards
Carlos
Enviado do meu iPhone
No dia 16/06/2016, Ã s 16:53, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> escreveu:
| Quote: | At 08:36 AM 6/16/2016, you wrote:
| Quote: | | One place on my Cessna I have found a breaker VERY useful is the 12v power port (aka Cigarette lighter). Sometimes items with too big a draw get plugged in and blow the breaker, remove item, reset, and can still use other items in flight. |
The factory stock 'cigar' lighter? Waaayyyy back when,
the folks at the factory decided it was better to call
them cigar lighters . . . seems that tobacco smoke
particulates were too fine to be captured by the
paper air filter for the vacuum driven instruments.
We were seeing early demise of gyros flown by
pilots who smoked while airborne . . .
Somebody got the idea that this problem might be
helped if we started calling them cigar lighters . . .
fatter smoke particles . . .
<6bca009.jpg>
In any case, your anecdote is the corollary to
outlets in your house where a branch circuit
is shared by other outlets with wildly variable
total loads. Too many hot-dog cookers, microwaves,
and pizza ovens plugged in at the same time
may pop a breaker.
Fuses and breakers intended to supply system
hardware should not be shared with any other
system . . . unless loss of ALL systems is
a low, acceptable risk condition. The founding
philosophy for bus structures with independently
protected feeders is ISOLATION between systems
such that no fault brings down more than the
affected system.
How much stuff do you plug into the cigar
lighter? On many Cessnas of the 1970 time frame
the cigar lighter was powered through a 20A fuse
and later a 10A breaker. 10A is a LOT of 'stuff'
to run from such a connector
<6bca066.jpg>
Bob . . .
|
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jmjones2000(at)mindspring
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| Posted: Thu Jun 16, 2016 10:11 am Post subject: Review request for RV-9 Electrical System (G3X, GTN, etc |
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Keep in mind that the circuit breaker needs to be matched to the appropriate wire size. The circuit protection is there to protect the wire, not the load.
First assess how much current the load will pull. Then choose an appropriate sized wire and circuit protection.
Justin
On Jun 16, 2016, at 08:25, William Greenley <wgreenley(at)gmail.com (wgreenley(at)gmail.com)> wrote:
| Quote: | v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} <![endif]--> <![endif]--> <![endif]-->
Thanks for the info, I need to check the wiring et al on mine, it only has a 5A breaker. Which is easy to blow. Just assumed it was correct.
From: owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com) [mailto:owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com)] On Behalf Of Robert L. Nuckolls, III
Sent: Thursday, June 16, 2016 11:54 AM
To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)
Subject: RE: Re: Review request for RV-9 Electrical System (G3X, GTN, etc)
At 08:36 AM 6/16/2016, you wrote:
One place on my Cessna I have found a breaker VERY useful is the 12v power port (aka Cigarette lighter). Sometimes items with too big a draw get plugged in and blow the breaker, remove item, reset, and can still use other items in flight.
The factory stock 'cigar' lighter? Waaayyyy back when,
the folks at the factory decided it was better to call
them cigar lighters . . . seems that tobacco smoke
particulates were too fine to be captured by the
paper air filter for the vacuum driven instruments.
We were seeing early demise of gyros flown by
pilots who smoked while airborne . . .
Somebody got the idea that this problem might be
helped if we started calling them cigar lighters . . .
fatter smoke particles . . .
<image001.jpg>
In any case, your anecdote is the corollary to
outlets in your house where a branch circuit
is shared by other outlets with wildly variable
total loads. Too many hot-dog cookers, microwaves,
and pizza ovens plugged in at the same time
may pop a breaker.
Fuses and breakers intended to supply system
hardware should not be shared with any other
system . . . unless loss of ALL systems is
a low, acceptable risk condition. The founding
philosophy for bus structures with independently
protected feeders is ISOLATION between systems
such that no fault brings down more than the
affected system.
How much stuff do you plug into the cigar
lighter? On many Cessnas of the 1970 time frame
the cigar lighter was powered through a 20A fuse
and later a 10A breaker. 10A is a LOT of 'stuff'
to run from such a connector
<image002.jpg>
Bob . . .
|
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http://www.matronics.com/Navigator?AeroElectric-List |
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wgreenley
Joined: 09 Jan 2010
Posts: 100
Location: Dowagiac, MI
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| Posted: Thu Jun 16, 2016 10:34 am Post subject: Review request for RV-9 Electrical System (G3X, GTN, etc |
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That is my plan, trace all wiring and analyze connections.
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Justin Jones
Sent: Thursday, June 16, 2016 2:10 PM
To: aeroelectric-list(at)matronics.com
Subject: Re: Re: Review request for RV-9 Electrical System (G3X, GTN, etc)
Keep in mind that the circuit breaker needs to be matched to the appropriate wire size. The circuit protection is there to protect the wire, not the load.
First assess how much current the load will pull. Then choose an appropriate sized wire and circuit protection.
Justin
On Jun 16, 2016, at 08:25, William Greenley <wgreenley(at)gmail.com (wgreenley(at)gmail.com)> wrote:
| Quote: |
Thanks for the info, I need to check the wiring et al on mine, it only has a 5A breaker. Which is easy to blow. Just assumed it was correct.
From: owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com) [mailto:owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com)] On Behalf Of Robert L. Nuckolls, III
Sent: Thursday, June 16, 2016 11:54 AM
To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)
Subject: RE: Re: Review request for RV-9 Electrical System (G3X, GTN, etc)
At 08:36 AM 6/16/2016, you wrote:
One place on my Cessna I have found a breaker VERY useful is the 12v power port (aka Cigarette lighter). Sometimes items with too big a draw get plugged in and blow the breaker, remove item, reset, and can still use other items in flight.
The factory stock 'cigar' lighter? Waaayyyy back when,
the folks at the factory decided it was better to call
them cigar lighters . . . seems that tobacco smoke
particulates were too fine to be captured by the
paper air filter for the vacuum driven instruments.
We were seeing early demise of gyros flown by
pilots who smoked while airborne . . .
Somebody got the idea that this problem might be
helped if we started calling them cigar lighters . . .
fatter smoke particles . . .
<image001.jpg>
In any case, your anecdote is the corollary to
outlets in your house where a branch circuit
is shared by other outlets with wildly variable
total loads. Too many hot-dog cookers, microwaves,
and pizza ovens plugged in at the same time
may pop a breaker.
Fuses and breakers intended to supply system
hardware should not be shared with any other
system . . . unless loss of ALL systems is
a low, acceptable risk condition. The founding
philosophy for bus structures with independently
protected feeders is ISOLATION between systems
such that no fault brings down more than the
affected system.
How much stuff do you plug into the cigar
lighter? On many Cessnas of the 1970 time frame
the cigar lighter was powered through a 20A fuse
and later a 10A breaker. 10A is a LOT of 'stuff'
to run from such a connector
<image002.jpg>
Bob . . .
|
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http://www.matronics.com/Navigator?AeroElectric-List |
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