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#12605 - 08/13/02 05:09 AM Voltage Drop
Frank Cinker Offline
Member

Registered: 07/29/01
Posts: 317
Loc: Pennsylvania
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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#12606 - 08/13/02 03:07 PM Re: Voltage Drop
Bob Offline
Member

Registered: 02/05/02
Posts: 182
Loc: Mobile, AL, USA
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.

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#12607 - 08/13/02 03:14 PM Re: Voltage Drop
pauluk Offline
Member

Registered: 08/11/01
Posts: 7693
Loc: Norfolk, England
I'll second that.

Quote:

VD=2KLI/CM


Huh???

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#12608 - 08/14/02 03:17 AM Re: Voltage Drop
Frank Cinker Offline
Member

Registered: 07/29/01
Posts: 317
Loc: Pennsylvania
pauluk-

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

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#12609 - 08/14/02 04:54 AM Re: Voltage Drop
pauluk Offline
Member

Registered: 08/11/01
Posts: 7693
Loc: Norfolk, England
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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