Home » Public Forums » GMCnet » [GMCnet] Newly installed VIAIR 400C compressor
| [GMCnet] Newly installed VIAIR 400C compressor [message #306710] |
Thu, 08 September 2016 11:29  |
glwgmc
Messages: 1014
Registered: June 2004
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Others will likely chime in here, but you need to rethink your wiring. Electricity will follow the path of least resistance and will not simply send 1/3rd of the amps down each of your three small wires. All 19 amps are going to go down one of those three until it burns up. My suggestion would be to replace your three 18ga wires with one proper 10ga wire as soon as you can.
Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR
glwork@mac.com
http://jerrywork.com
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Message: 3
Date: Thu, 08 Sep 2016 07:11:28 -0600
From: Johnny Bridges
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Newly installed VIAIR 400C compressor
Message-ID:
Content-Type: text/plain; charset="utf-8"
My Viair is run by a relay I put in, which relay is energized by the original wiring. I fused it at 30 amps, ViAir claims a 19 amp draw. I was out
of large wire, so it has three identical runs of 18GA wire to the relay.
--johnny
--
'76 23' transmode Norris upfit, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
"Sometimes I wonder what tomorrow's gonna bring when I think about my dirty life and times" --Warren Zevon
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Jerry & Sharon Work
78 Royale
Kerby, OR
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| Re: [GMCnet] Newly installed VIAIR 400C compressor [message #306713 is a reply to message #306710] |
Thu, 08 September 2016 11:54  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
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My ammeter doesn't agree with you, Jerry. Consider if you will, whether a number of copper strands have insulation between some of them or not won't affect the current carrying ability of those strands. Or as an exercise, strip a piece of 12GA stranded. Untwist it a bit, and separate the strands at some point into three bundles. Note that the carrying capacity is unchanged.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
[Updated on: Thu, 08 September 2016 11:59] Report message to a moderator |
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| Re: [GMCnet] Newly installed VIAIR 400C compressor [message #306716 is a reply to message #306710] |
Thu, 08 September 2016 12:10 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
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Not as long as the wires are the same length. Copper has a high positive coefficient of resistance. as one wire carries more current it will warm up and increase in resistance causing the other wires to carry more current.
3 18AWG isn't pretty but should be good enough for a 2 foot run, 2 x .006ohms per foot / 3 aint bad
----------------------------------------
>
> Others will likely chime in here, but you need to rethink your wiring. Electricity will follow the path of least resistance and will not simply send 1/3rd of the amps down each of your three small wires. All 19 amps are going to go down one of those three until it burns up. My suggestion would be to replace your three 18ga wires with one proper 10ga wire as soon as you can.
>
> Jerry
> Jerry Work
> The Dovetail Joint
> Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR
>
> glwork@mac.com
> http://jerrywork.com
>
> =============
> Message: 3
> Date: Thu, 08 Sep 2016 07:11:28 -0600
> From: Johnny Bridges
> To: gmclist@list.gmcnet.org
> Subject: Re: [GMCnet] Newly installed VIAIR 400C compressor
> Message-ID:
> Content-Type: text/plain; charset="utf-8"
>
> My Viair is run by a relay I put in, which relay is energized by the original wiring. I fused it at 30 amps, ViAir claims a 19 amp draw. I was out
> of large wire, so it has three identical runs of 18GA wire to the relay.
>
> --johnny
> --
> '76 23' transmode Norris upfit, 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
>
> "Sometimes I wonder what tomorrow's gonna bring when I think about my dirty life and times" --Warren Zevon
> ================
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>
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Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: [GMCnet] Newly installed VIAIR 400C compressor [message #306724 is a reply to message #306720] |
Thu, 08 September 2016 15:08 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
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glw
I think that Thevenin guy would agree with you
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>
> glwgmc wrote on Thu, 08 September 2016 11:29
>> Others will likely chime in here, but you need to rethink your wiring. Electricity will follow the path of least resistance and will not simply
>> send 1/3rd of the amps down each of your three small wires. All 19 amps are going to go down one of those three until it burns up. My suggestion
>> would be to replace your three 18ga wires with one proper 10ga wire as soon as you can.
>>
>> Jerry
>> Jerry Work
> Is that your final answer, or do you want to guess again? You would be right ONLY if there was a BIG difference in the resistance among the wires.
> Same gauge, same length, will divide nearly exactly into thirds.
>
> If one wire has half the resistance as the each of the other two, it will still carry only half of the load, and the other two will each carry a
> quarter.
>
> My EE degree might be 40 years old, but they haven't redesigned electricity since then.
> --
> 73 23' Sequoia 4 Sale
> 73 23' CanyonLands Parts Unit 4 Sale
> Upper Alabama
> "Highest price does not guarantee highest quality."
>
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Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: [GMCnet] Newly installed VIAIR 400C compressor [message #306743 is a reply to message #306710] |
Thu, 08 September 2016 18:36 |
k2gkk
Messages: 4452
Registered: November 2009
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Any difference in the resistance between three basically equal length #18 Gauge wires will be so miniscule as to be immeasurable!
Mac in OKC
________________________________
From: Gmclist on behalf of Ken Henderson
Sent: Thursday, September 8, 2016 18:29
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Newly installed VIAIR 400C compressor
Not quite accurate, Jerry. The three wires will have different resistances
so that they will not all carry the same current, but each will carry some
current. Simple parallel circuit.
For example, if you put 12 volts across wires of 1, 2, and 3 Ohms
resistance, 1 will carry 12/1 amps, the second will carry 12/2 amps, and
the third 12/3 amps, for a total of 12+6+4=22 amps. Johnny's wires will
not be nearly that far apart in resistance so will carry very nearly equal
currents.
Ken H.
On Thu, Sep 8, 2016 at 12:29 PM, Gerald Work wrote:
> Others will likely chime in here, but you need to rethink your wiring.
> Electricity will follow the path of least resistance and will not simply
> send 1/3rd of the amps down each of your three small wires. All 19 amps
> are going to go down one of those three until it burns up. My suggestion
> would be to replace your three 18ga wires with one proper 10ga wire as soon
> as you can.
>
>
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| Re: [GMCnet] Newly installed VIAIR 400C compressor [message #306744 is a reply to message #306710] |
Thu, 08 September 2016 18:29 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Not quite accurate, Jerry. The three wires will have different resistances
so that they will not all carry the same current, but each will carry some
current. Simple parallel circuit.
For example, if you put 12 volts across wires of 1, 2, and 3 Ohms
resistance, 1 will carry 12/1 amps, the second will carry 12/2 amps, and
the third 12/3 amps, for a total of 12+6+4=22 amps. Johnny's wires will
not be nearly that far apart in resistance so will carry very nearly equal
currents.
Ken H.
On Thu, Sep 8, 2016 at 12:29 PM, Gerald Work wrote:
> Others will likely chime in here, but you need to rethink your wiring.
> Electricity will follow the path of least resistance and will not simply
> send 1/3rd of the amps down each of your three small wires. All 19 amps
> are going to go down one of those three until it burns up. My suggestion
> would be to replace your three 18ga wires with one proper 10ga wire as soon
> as you can.
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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