The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
Wow, that was close!
by jraef
11/28/16 07:06 PM
Earthquake in New Zeeland
by RODALCO
11/27/16 11:25 PM
Calling all Non-US members!! (Non-US only)
by Tjia1981
11/27/16 06:33 AM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 9
Texas_Ranger 8
sparkyinak 7
Trumpy 6
Who's Online
0 registered (), 216 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#128974 - 06/09/04 06:37 AM Parallel conductors
ayrton Offline
Member

Registered: 12/21/01
Posts: 205
Loc: Pa
Why do you think the code prohibits running parallel conductors smaller than 1/0??

Top
#128975 - 06/09/04 09:00 AM Re: Parallel conductors
Creighton Offline
Member

Registered: 01/06/02
Posts: 56
Loc: Hayward, CA
If you study the ampacity tables you will see that in the larger sizes of wire an increase in size results in relatively little increase in ampacity. Forinstance, a 50% increase from 10 kcmil to 10.5 kcmil results in an increase in carrying capacity in amperes of less than 15%.
There is no need to parallel conductors smaller than 1/0 because the difference between the carrying capacity in these sizes is much less pronounced.
Although the NEC places the limit, it is really physics that limits paralleled conductors to 1/0 and larger.
Creighton

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals