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#72654 - 12/06/06 03:57 PM Extension Cords-Which to Use First?  
wendel  Offline
Member
Joined: Aug 2004
Posts: 55
I have two extension cords both are 50 feet long. One is 12 gauge and the other is 14 gauge. I want to power an electric saw.

I want the least voltage drop over the combined 100 feet so I keep the current draw by the saw motor as low as possible minimizing heat damage. Which should I plug into the 120 volt receptical first? Why?


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#72655 - 12/06/06 04:16 PM Re: Extension Cords-Which to Use First?  
scameron81  Offline
Member
Joined: Feb 2004
Posts: 75
Healdsburg, ca, USA
I don't think it matters. The resistance will be the sum of the two extension cords regardless of which one comes first and the distance is still the same. But I could be wrong (it wouldn't be the first time.)


#72656 - 12/06/06 04:53 PM Re: Extension Cords-Which to Use First?  
SvenNYC  Offline
Member
Joined: Aug 2002
Posts: 1,691
New York City
Yeah....it's still, essentially two resistors in series. Don't think it really matters which "gets it" first.

If it makes you feel better, though, I'd go with the #12 first and then hook in the #14.

Of course I betcha the wiring in the wall is #14.... [Linked Image]

Would there really be THAT much voltage drop over that much wire?


#72657 - 12/06/06 05:15 PM Re: Extension Cords-Which to Use First?  
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
It's all going to be one series circuit whichever way you do it:

#1. Hot -> 50' #12 -> 50' #14 -> Tool -> 50' #14 -> 50' #12 -> Neutral.

#2. Hot -> 50' #14 -> 50' #12 -> Tool -> 50' #12 -> 50' #14 -> Neutral.

Either way you have 100 ft. of #14 plus 100 ft. of #12 conductor in the circuit, so the resistance of the extension cords will be the same.


#72658 - 12/06/06 05:36 PM Re: Extension Cords-Which to Use First?  
rabbitgun  Offline
Member
Joined: Jul 2006
Posts: 23
Nope it does not matter.
That said, even with a 16A load the drop is only right around 4 volts.


#72659 - 12/07/06 04:15 AM Re: Extension Cords-Which to Use First?  
e57  Offline
Member
Joined: May 2003
Posts: 2,876
S.F.,CA USA
Have you thought of installing an outlet closer? [Linked Image]


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#72660 - 12/07/06 10:34 AM Re: Extension Cords-Which to Use First?  
Zapped  Offline
Member
Joined: Oct 2002
Posts: 482
Huntington Beach, CA, USA
Two resistors in series: R(total)=R1+R2. No difference with placement. If it's causing you to lose sleep, spend the $20 on another 50' #12 extension.


#72661 - 12/08/06 07:56 PM Re: Extension Cords-Which to Use First?  
napervillesoundtech  Offline
Member
Joined: Feb 2006
Posts: 144
Naperville, IL, USA
Think about inrush current, though. Get a 100' 10/3 cord. just a thought.



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