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ebus wire sizing

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jessejenks(at)hotmail.com
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Posted: Thu Jan 14, 2010 12:21 pm Post subject: ebus wire sizing

I'm trying to get to the point where I can actually run some wires so I feel like I'm getting something done while I continue to learn about and plan my electrical system. I read the section in AEC on wire sizing C but it leaves me feeling like I won't be able to figure this out on my own. I understand that care must be taken here C but in real life do I need to do a whole page of algebra for each wire? Is there a quick reference rule-of-thumb chart somewhere?

Can someone give me a best guess on wire size for a 12' e-bus alternate feed wire from my rear mounted battery considering a 6 amp max load (a guess in itself at this point)?

While you're at it C how about for the battery contactor wire? Is 22awg still ok for a 12' run?

Also C I deduced from the chart on Skytec's website that to be safe I would use 1 gauge cable for the battery-starter connection C which appears to be about 15'. Any thoughts on this? Obviously I would rather go a little smaller if possible. I plan to use welding cable.

The last question is; can I run these 3 wires together in the same holes(fat battery C contactor C and e-bus)?

Thanks.

Jesse



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nuckolls.bob(at)aeroelect
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Posted: Fri Jan 15, 2010 5:16 am Post subject: ebus wire sizing

At 02:16 PM 1/14/2010, you wrote:

I'm trying to get to the point where I can actually run some wires so 

I feel like I'm getting something done while I continue to learn 

about and plan my electrical system. I read the section in AEC on 

wire sizing, but it leaves me feeling like I won't be able to figure 

this out on my own. I understand that care must be taken here, but in 

real life do I need to do a whole page of algebra for each wire? Is 

there a quick reference rule-of-thumb chart somewhere?



    Yes, it's in the chapter on Wire in the

    'Connection . . . it's also found at:



http://www.aeroelectric.com/articles/wiresize.pdf



Can someone give me a best guess on wire size for a 12' e-bus 

alternate feed wire from my rear mounted battery considering a 6 amp 

max load (a guess in itself at this point)?



    Run a 14 AWG for this wire . . . yes, oversized

    but will accommodate future changes without

    having to pull new wire. Keeps voltage drop low

    too. See figure Z-32.



While you're at it, how about for the battery contactor wire? Is 

22awg still ok for a 12' run?



    yes



Also, I deduced from the chart on Skytec's website that to be safe I 

would use 1 gauge cable for the battery-starter connection, which 

appears to be about 15'. Any thoughts on this? Obviously I would 

rather go a little smaller if possible. I plan to use welding cable.



    #2 is fine for all runs except those that

    connect to battery. Drop to #4 for these

    short jumpers.



The last question is; can I run these 3 wires together in the same 

holes(fat battery, contactor, and e-bus)?



    don't know why not . . .



    Bob . . .

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