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#58732 - 11/15/05 09:46 PM Derating wire plus voltage drop  
bot540  Offline
Member
Joined: Sep 2004
Posts: 174
Vernon Hills, IL
If you already upsized the wire for voltage drop would you have to further derate the wire if you have more than 4 current carrying conductors? Do the calculations compound?


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#58733 - 11/15/05 10:22 PM Re: Derating wire plus voltage drop  
Cow  Offline
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Joined: Jul 2005
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Hermiston, OR


#58734 - 11/15/05 11:44 PM Re: Derating wire plus voltage drop  
Bob  Offline
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Joined: Feb 2002
Posts: 182
Mobile, AL, USA
First caculate the load.
Size the wire for the load.
Derate per the table 80%. This will give you a larger conductor. Caculate the VD using this conductor.
If you have to go larger you do not derate again.



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