ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Where is Everyone?
by gfretwell - 04/09/21 01:08 AM
HI gang, long time since I was here...
by gfretwell - 04/09/21 01:02 AM
Lock-down Thread
by gfretwell - 04/06/21 09:30 PM
Portable Generator Grounding
by JoeTestingEngr - 03/14/21 03:48 PM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 6 guests, and 14 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
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

Work Gear for Electricians and the Trades
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.



Huh??? [Linked Image]

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).


2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman


Member Spotlight
Posts: 22
Joined: August 2009
Show All Member Profiles 
Top Posters(30 Days)
BigB 4
Popular Topics(Views)
277,354 Are you busy
211,136 Re: Forum
198,156 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3