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

Topic Options
Rate This Topic
#29307 - 09/13/03 03:58 PM ampacity
Eandrew Offline
Member
Registered: 05/24/02
Posts: 68
Loc: seattle, wa, usa
I was wondering why, when the definition of ampacity is " the continuous current that a conductor can carry without exceeding its temperature rating (as listed in 310.16) do you still have to increase that ampacity 125% for a continuous load. Is the word "continuous" in the definition of ampacity not the same a "continuous " in continuous load?
Top
Work Gear for Electricians and the Trades
#29308 - 09/20/03 09:50 AM Re: ampacity
triple Offline
Member
Registered: 04/01/02
Posts: 184
Loc: Wisconsin
I could be wrong (often am) but I thought the 125% was primarily factored in for the OCP. Most OCPs are not rated for continuous use at 100%. As far as I know, as long as the rules for all other variables (such as #CCC, amb. temp, termination rating, OCP, etc.) are adhered to, conductors CAN be used at 100% of their capacity for an indefinite period of time. Am I wrong again?
Top
#29309 - 09/20/03 10:37 AM Re: ampacity
Roger Offline
Member
Registered: 05/18/02
Posts: 1716
Loc: N.C.
Erik, look here. http://electrical-contractor.net/ubb/Forum2/HTML/000583.html

You'll find this familiar.

Roger
Top
#29310 - 09/22/03 01:26 PM Re: ampacity
triple Offline
Member
Registered: 04/01/02
Posts: 184
Loc: Wisconsin
How do ya like that...I was right this time. It was bound to happen sooner or later.
Top
#29311 - 09/22/03 04:51 PM Re: ampacity
Roger Offline
Member
Registered: 05/18/02
Posts: 1716
Loc: N.C.
Triple, don't cut yoursef short.

Roger
Top

Member Spotlight
Member Since: 01/22/05
Posts: 5316
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 54 Guests and 8 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 51
HotLine1 43
gfretwell 17
Trumpy 16
Ruben Rocha 13
 
Newest Members
clee512, Jdscott2005, FAIZAN, Regitest2, sureshazhagai

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