Why Do Differently Gauged Power Cords All Rank At The Same Amp And Voltage Use? - Electrical - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 01-08-2011, 12:55 AM   #1
Newbie
 
Join Date: Jan 2011
Location: Miami
Posts: 10
Rewards Points: 10
Default

Why do differently gauged power cords all rank at the same amp and voltage use?


http://www.contractorsdirect.com/Fel...Extension-Cord

10/3 gage: 15 Amps, 1875 Watts, 125 Volts.

http://www.harborfreight.com/10-ft-1...&hft_adv=10013

12/3 gage: 15 Amps, 1875 Watts, 125 Volts.

http://www.northerntool.com/shop/too...nsion%2520cord

14/3 gage: 15 Amps, 1875 Watts, 125 Volts.


??? WTF? What am I not understanding here??

Advertisement

Freshbrood is offline   Reply With Quote
Old 01-08-2011, 01:25 AM   #2
Electrical Contractor
 
kbsparky's Avatar
 
Join Date: Sep 2008
Location: Delmarva
Posts: 3,368
Rewards Points: 2,000
Default

Why do differently gauged power cords all rank at the same amp and voltage use?


They all have NEMA 5-15 attachment plugs. And that is the max. allowable load for a 15 Amp plug.

The difference in the wire gauges is the voltage drop, or lack thereof.

Advertisement

__________________
-KB

Life is uncertain -- eat dessert first!!
kbsparky is offline   Reply With Quote
Old 01-08-2011, 01:31 AM   #3
Wire Chewer
 
Red Squirrel's Avatar
 
Join Date: Jun 2009
Location: Ontario, Canada
Posts: 3,221
Rewards Points: 2,020
Default

Why do differently gauged power cords all rank at the same amp and voltage use?


I've actually seen 18awg extensions rated for 15 amps. That kinda makes me wonder. I did run a 15 amp air conditioner off one and it seemed to do fine... was touching it every now and then and it never got hot. So guess the material and construction of the wiring plays a role too. I'm sure these are tested quite well at UL labs before they get their rating.
Red Squirrel is offline   Reply With Quote
Old 01-08-2011, 02:11 AM   #4
nap
You talking to me?
 
nap's Avatar
 
Join Date: Dec 2007
Location: sw mi
Posts: 5,407
Rewards Points: 2,000
Default

Why do differently gauged power cords all rank at the same amp and voltage use?


Quote:
Originally Posted by Red Squirrel View Post
I've actually seen 18awg extensions rated for 15 amps. That kinda makes me wonder. I did run a 15 amp air conditioner off one and it seemed to do fine... was touching it every now and then and it never got hot. So guess the material and construction of the wiring plays a role too. I'm sure these are tested quite well at UL labs before they get their rating.
so, sjo, and other types of cord have different ratings than NM, thhn, thwn, and the sort.

as well, the cords are UL listed which means the code does not apply to them, at least in terms of ampacity. If they can pass a UL test while running 100 amps through #10, they could rate their cord at 100 amps.
nap is offline   Reply With Quote
Old 01-08-2011, 03:12 AM   #5
Scared Electrician
 
Saturday Cowboy's Avatar
 
Join Date: Nov 2009
Location: Colorado
Posts: 715
Rewards Points: 500
Default

Why do differently gauged power cords all rank at the same amp and voltage use?


keep in mind these cord operate in free air. Remember that foreign imports do not have to adhere to our regs. So we get cheap crap that just barely meets (and some times doesn't) standards. Also length plays a part
__________________
Ragged Trousered Philanthropist


Please follow the code - its there for your safety no matter how inconvenient.
Saturday Cowboy is offline   Reply With Quote
Old 01-08-2011, 07:15 AM   #6
I ask the impossible!
 
Join Date: Aug 2010
Location: Royal Oak, Michigan
Posts: 1,074
Rewards Points: 508
Blog Entries: 7
Default

Why do differently gauged power cords all rank at the same amp and voltage use?


Different lengths too, the 10 gage is 50 feet, he 14 gage is 25 feet.
WillK is online now   Reply With Quote
Old 01-08-2011, 08:36 AM   #7
Electrical Contractor
 
jbfan's Avatar
 
Join Date: Jun 2004
Location: Newnan GA
Posts: 5,964
Rewards Points: 2,324
Default

Why do differently gauged power cords all rank at the same amp and voltage use?


Still trying to hook up that water heater eh?


Point-of-use shower head heater power use

Advertisement

__________________
Yes I am a Pirate, 200 years too late. "Jimmy Buffett"

Last edited by jbfan; 01-08-2011 at 09:40 AM. Reason: Added link
jbfan is online now   Reply With Quote
Reply

Tags
cords gages amps


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Top of Page | View New Posts