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airlincoln(at)sbcglobal.n
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 Posted: Thu Jan 03, 2008 10:20 pm Post subject: sizing wire |
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I'm almost through "The Aero-Electric Connection" and haven't been able to find the "Six-Step Guide to Sizing Wire" so could someone back me up on my methodology before I go off and size every wire of my wiring diagram incorrectly?
As an example: I will have a 75W landing light in each wingtip controlled with one switch with a wire run length for each light of 15 feet (including the ground wire from each lamp to the spar). Worst case (alternator out with a 12V battery), each lamp will draw 6.25A so initially you'd think 20 AWG wire would suffice (7A max) but since we want to keep the voltage drop below 0.5V we need to use 16 AWG wire (15 foot resistance of .06 ohms times 6.25A is .38V which is less than 0.50V drop). Since my 16 AWG wire can handle 12.5A, I could safely use a 10A fuse for each light and not worry about the wire burning up or a premature trip when first turning on the lights. Alternatively, I could use 14 AWG wire (15A max) and a single 15A fuse for both lights. The switch should be either a 2-2 (16AWG scenario) or a 1-2 (14AWG scenario) rated for 15A.
Whew! Have I got all that correct? As B&J once said: "Thanks for Your Support!"
Lincoln Keill
Sacramento, CA
RV-7A
P.S. Can anyone recommend one supplier to get all the goodies for a Z-11 system (wire, switches, fuse blocks, starter & battery contactors, fuse links, shunts, silicon diode array, ground bus blocks,crowbar overvoltage protection, low voltage module, etc. etc.)?
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mike109g6(at)insideconnec
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| Posted: Thu Jan 03, 2008 10:50 pm Post subject: sizing wire |
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B&C, Terminal Town, Steinair, are all excellent suppliers of all the 'goodies" that you will need and tools. Aircraftspruce, Autozone, NAPA, Advance, and EBay, should not be counted out. You know the old saying, 'shop till you drop before you drop the bucks'. Got 1000ft roll of new 22awg unshielded on Ebay for $16 per Bob's advice. On your lights, math sounds good, but my manufacturer(sold by Van's) states that 16awg is more than enough for 100w halogens. Still went with the 14awg-already had it on hand.
Mike H
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fvalarm(at)rapidnet.net
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| Posted: Thu Jan 03, 2008 10:53 pm Post subject: sizing wire |
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LK,
You could probably source all that stuff at http://www.bandc.biz/ Click on the yellow link "products".
I'm looking at the wiring chart sample that comes with my preview plans. It indicates 14 awg would be the size to go with. This will also allow you to fit 100watt bulbs in the future. Separately fused at 10 amps.
Just my .02 cents worth. I'm sure the experts will chime in, in the morning.
Bevan
Rv7A wiring
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Lincoln Keill
Sent: Thursday, January 03, 2008 10:18 PM
To: aeroelectric-list(at)matronics.com
Subject: sizing wire
I'm almost through "The Aero-Electric Connection" and haven't been able to find the "Six-Step Guide to Sizing Wire" so could someone back me up on my methodology before I go off and size every wire of my wiring diagram incorrectly?
As an example: I will have a 75W landing light in each wingtip controlled with one switch with a wire run length for each light of 15 feet (including the ground wire from each lamp to the spar). Worst case (alternator out with a 12V battery), each lamp will draw 6.25A so initially you'd think 20 AWG wire would suffice (7A max) but since we want to keep the voltage drop below 0.5V we need to use 16 AWG wire (15 foot resistance of .06 ohms times 6.25A is .38V which is less than 0.50V drop). Since my 16 AWG wire can handle 12.5A, I could safely use a 10A fuse for each light and not worry about the wire burning up or a premature trip when first turning on the lights. Alternatively, I could use 14 AWG wire (15A max) and a single 15A fuse for both lights. The switch should be either a 2-2 (16AWG scenario) or a 1-2 (14AWG scenario) rated for 15A.
Whew! Have I got all that correct? As B&J once said: "Thanks for Your Support!"
Lincoln Keill
Sacramento, CA
RV-7A
P.S. Can anyone recommend one supplier to get all the goodies for a Z-11 system (wire, switches, fuse blocks, starter & battery contactors, fuse links, shunts, silicon diode array, ground bus blocks,crowbar overvoltage protection, low voltage module, etc. etc.)?
[quote]
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
[b]
| | - 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:
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schaefer(at)rts-services.
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| Posted: Fri Jan 04, 2008 5:26 am Post subject: sizing wire |
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You are likely to replace hot high current lamps with cool, low current LED lamps in the future.
That technology is moving quite fast and the inverse price/intensity ratio is getting better all the time.
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of B Tomm
Sent: Friday, January 04, 2008 12:53 AM
To: aeroelectric-list(at)matronics.com
Subject: RE: AeroElectric-List: sizing wire
LK,
You could probably source all that stuff at http://www.bandc.biz/ Click on the yellow link "products".
I'm looking at the wiring chart sample that comes with my preview plans. It indicates 14 awg would be the size to go with. This will also allow you to fit 100watt bulbs in the future. Separately fused at 10 amps.
Just my .02 cents worth. I'm sure the experts will chime in, in the morning.
Bevan
Rv7A wiring
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Lincoln Keill
Sent: Thursday, January 03, 2008 10:18 PM
To: aeroelectric-list(at)matronics.com
Subject: sizing wire
I'm almost through "The Aero-Electric Connection" and haven't been able to find the "Six-Step Guide to Sizing Wire" so could someone back me up on my methodology before I go off and size every wire of my wiring diagram incorrectly?
As an example: I will have a 75W landing light in each wingtip controlled with one switch with a wire run length for each light of 15 feet (including the ground wire from each lamp to the spar). Worst case (alternator out with a 12V battery), each lamp will draw 6.25A so initially you'd think 20 AWG wire would suffice (7A max) but since we want to keep the voltage drop below 0.5V we need to use 16 AWG wire (15 foot resistance of .06 ohms times 6.25A is .38V which is less than 0.50V drop). Since my 16 AWG wire can handle 12.5A, I could safely use a 10A fuse [b]for each light[/b] and not worry about the wire burning up or a premature trip when first turning on the lights. Alternatively, I could use 14 AWG wire (15A max) and a single 15A fuse [b]for both lights[/b]. The switch should be either a 2-2 (16AWG scenario) or a 1-2 (14AWG scenario) rated for 15A.
Whew! Have I got all that correct? As B&J once said: "Thanks for Your Support!"
Lincoln Keill
Sacramento, CA
RV-7A
P.S. Can anyone recommend one supplier to get all the goodies for a Z-11 system (wire, switches, fuse blocks, starter & battery contactors, fuse links, shunts, silicon diode array, ground bus blocks,crowbar overvoltage protection, low voltage module, etc. etc.)?
| Quote: | | href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-Listhref="http://forums.matronics.com">http://forums.matronics.comhref="http://www.matronics.com/contribution">http://www.matronics.com/c |
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