The Murphy Builders Site

Hi all,

How does one figure out what size circuit breakers to
use.

For example landing lights and position lights?

Is there a formula?

Thanks,

-Jason

=====
________________________________________________

Jason Beall
Super Rebel No. 131
Aberdeen, Scotland, UK
super_rebel131@yahoo.com

__________________________________________________
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JASON

try getting book from aeroelectric connection on the web they have very good
book and sample wiring diagrams

http://www.aeroelectric.com/

mike#007

-----Original Message-----
From: Jason Beall [mailto:super_rebel131@yahoo.com]
Sent: October 17, 2002 3:28 PM
To: murphy-rebel@dcsol.com
Subject: sizing circuit breakers


Hi all,

How does one figure out what size circuit breakers to
use.

For example landing lights and position lights?

Is there a formula?

Thanks,

-Jason

=====
________________________________________________

Jason Beall
Super Rebel No. 131
Aberdeen, Scotland, UK
super_rebel131@yahoo.com

__________________________________________________
Do you Yahoo!?
Faith Hill - Exclusive Performances, Videos & More
http://faith.yahoo.com

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The 4313 has a list of amperages and wire sizes and
breaker sizes.


--- Jason Beall <super_rebel131@yahoo.com> wrote:

Hi all,

How does one figure out what size circuit breakers
to
use.

For example landing lights and position lights?

Is there a formula?

Thanks,

-Jason

=====
________________________________________________

Jason Beall
Super Rebel No. 131
Aberdeen, Scotland, UK
super_rebel131@yahoo.com

__________________________________________________
Do you Yahoo!?
Faith Hill - Exclusive Performances, Videos & More
http://faith.yahoo.com

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David M Sowder RCDD/LAN Specialist
Simple technology Solutions, Inc.
(812) 925-8240 (voice/fax)
(812) 204-2320

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Whats a 4313?

-Jason

--- David Sowder <is_msowder@yahoo.com> wrote:

The 4313 has a list of amperages and wire sizes and
breaker sizes.


--- Jason Beall <super_rebel131@yahoo.com> wrote:

Hi all,

How does one figure out what size circuit breakers
to
use.

For example landing lights and position lights?

Is there a formula?

Thanks,

-Jason

=====
________________________________________________

Jason Beall
Super Rebel No. 131
Aberdeen, Scotland, UK
super_rebel131@yahoo.com

__________________________________________________
Do you Yahoo!?
Faith Hill - Exclusive Performances, Videos & More
http://faith.yahoo.com

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=====
David M Sowder RCDD/LAN Specialist
Simple technology Solutions, Inc.
(812) 925-8240 (voice/fax)
(812) 204-2320

__________________________________________________
Do you Yahoo!?
Faith Hill - Exclusive Performances, Videos & More
http://faith.yahoo.com

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=====
________________________________________________

Jason Beall
Super Rebel No. 131
Aberdeen, Scotland, UK
super_rebel131@yahoo.com

__________________________________________________
Do you Yahoo!?
Faith Hill - Exclusive Performances, Videos & More
http://faith.yahoo.com



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I believe the reference is to the FAA's publication AC 43.13-1B 'ACCEPTABLE
METHODS TECHNIQUES, AND PRACTICES-AIRCRAFT INSPECTION AND REPAIR'(Chapter
11-Aircraft Electrical Systems, Section 4-Inspection of Circuit Protection
Devices, Paragraph 11-48 Determination of Circuit Breaker Ratings, Page 11-15).

Roger #687R
Eugene, OR USA!





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As a PS to my previous post on this thread, and in the event you don't have
that publication, you can download the referenced section (in Word format) at
the FAA's website. Try this link:

http://av-info.faa.gov/dst/43-13/

Roger #687R
Eugene, OR USA!



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Yes I highly recommend the aeroelectric book.
However if you have the ac43.13, you first add up how much current you
need to supply your lights. Then you use the table to decide the minimum
size wire to supply that current without excessive voltage drop or
heating of the wire. Too large of a wire is never a problem other than a
few grams of extra weight. Then you use the next table to select the
circuit breaker that will protect the WIRE in the event of a short. The
purpose of a fuse or breaker is always to protect the WIRE. Therefore
you can pick a smaller breaker than the table recommends as long as it
is above the current your lights will need. Breakers are slow to trip so
generally there is no need to allow for any extra surge current with
light bulbs.
Ken

Mike Jones wrote:

JASON

try getting book from aeroelectric connection on the web they have very good
book and sample wiring diagrams

http://www.aeroelectric.com/

mike#007

-----Original Message-----
From: Jason Beall [mailto:super_rebel131@yahoo.com]
Sent: October 17, 2002 3:28 PM
To: murphy-rebel@dcsol.com
Subject: sizing circuit breakers


Hi all,

How does one figure out what size circuit breakers to
use.

For example landing lights and position lights?

Is there a formula?

Thanks,

-Jason

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That's the FAA's offical airframe building and repair manuel. Great source of all kinds of info. Curt

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I've heard of a 40% rule of thumb for sizing circuit breakers. You don't
want more than a 40% gap between the highest expected load on a circuit when
operating normally and the rating of the breaker. For instance, a six amp
load should not be protected with a breaker larger than 10 amps. Otherwise,
something could potentially go wrong with the circuit and not trip the
breaker, except of course, a dead short. This could cause damage to
equipment or worse, cause a fire. Of course, you don't want the breaker
rating to be too close to the load and have it tripping all the time due to
momentary load fluctuations either. I learned this rule of thumb in the
satellite tracking station business, but electricity is electricity.

Mike Kimball
SR#044

-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com] On Behalf Of
Jason Beall
Sent: Thursday, October 17, 2002 11:28 AM
To: murphy-rebel@dcsol.com
Subject: sizing circuit breakers

Hi all,

How does one figure out what size circuit breakers to
use.

For example landing lights and position lights?

Is there a formula?

Thanks,

-Jason

=====
________________________________________________

Jason Beall
Super Rebel No. 131
Aberdeen, Scotland, UK
super_rebel131@yahoo.com

__________________________________________________
Do you Yahoo!?
Faith Hill - Exclusive Performances, Videos & More
http://faith.yahoo.com

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