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Voltage Drop #12605
08/13/02 08:09 AM
08/13/02 08:09 AM
F
Frank Cinker  Offline OP
Member
Joined: Jul 2001
Posts: 311
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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Re: Voltage Drop #12606
08/13/02 06:07 PM
08/13/02 06:07 PM
B
Bob  Offline
Member
Joined: Feb 2002
Posts: 182
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.

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

Quote

VD=2KLI/CM


Huh??? [Linked Image]

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

Re: Voltage Drop #12609
08/14/02 07:54 AM
08/14/02 07:54 AM
P
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
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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