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#29307 - 09/13/03 06:58 PM ampacity  
Eandrew  Offline
Member
Joined: May 2002
Posts: 68
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?


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#29308 - 09/20/03 12:50 PM Re: ampacity  
triple  Offline
Member
Joined: Apr 2002
Posts: 184
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?


#29309 - 09/20/03 01:37 PM Re: ampacity  
Roger  Offline
Member
Joined: May 2002
Posts: 1,716
N.C.
Erik, look here. http://electrical-contractor.net/ubb/Forum2/HTML/000583.html

You'll find this familiar. [Linked Image]

Roger


#29310 - 09/22/03 04:26 PM Re: ampacity  
triple  Offline
Member
Joined: Apr 2002
Posts: 184
Wisconsin
How do ya like that...I was right this time. It was bound to happen sooner or later.


#29311 - 09/22/03 07:51 PM Re: ampacity  
Roger  Offline
Member
Joined: May 2002
Posts: 1,716
N.C.
Triple, don't cut yoursef short. [Linked Image]

Roger



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