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Voltage Drop #12605 08/13/02 08:09 AM
Joined: Jul 2001
Posts: 311
Frank Cinker Offline OP
An existing aerial feeder consists of 800 feet of 6AWG and 100 feet of 10AWG. It's 120 volts, single phase. 15amp. load. What is the proper method of determining voltage drop when there are two different size conductors on the same feeder.
I use VD=2KLI/CM

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Re: Voltage Drop #12606 08/13/02 06:07 PM
Joined: Feb 2002
Posts: 182
Bob Offline
Use the formula the caculate 800 ft of #6 with 15 amps. Do the same for the #10 at 100 ft with 15 amps and add the two together for the total VD.

Re: Voltage Drop #12607 08/13/02 06:14 PM
Joined: Aug 2001
Posts: 7,520
pauluk Offline
I'll second that.



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Re: Voltage Drop #12608 08/14/02 06:17 AM
Joined: Jul 2001
Posts: 311
Frank Cinker Offline OP

VD= Voltage drop
2= length of circuit x "2"
K= K-factor. 12.9 for copper conductor
L= Length of circuit
I= Amps
CM= Circular mill

Re: Voltage Drop #12609 08/14/02 07:54 AM
Joined: Aug 2001
Posts: 7,520
pauluk Offline
Thanks. It was getting late and the CM part just didn't register in my mind for some reason (we don't measure in circular mils here).


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