NEC 2008, table 400.5(B) note#1
- Thread starter hashim
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barbeer
Senior Member
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- Pinellas County, FL
individual conductor not in physical contact with each other except in length not to exceed 24 inch where passing through the wall of an enclosure.
?:wink:
- Location
- Logan, Utah
First off welcome to the forum.
Do you have a specific installation that you are questioning?
If you could give us a little more information we would be able to give you a better answer.
Chris
- Location
- Lockport, IL
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- Semi-Retired Electrical Engineer
Well, we do know that,
(1) The ampacity of a conductor will depend on its ability to reject heat to its environment, that
(2) Conductors in close proximity with each other will interfere with the heat rejection process, and that
(3) Short run of conductors that are close to each other will not have as much impact as having the entire run being close to each other.
So what this is telling me is that I can use the ampacity numbers in the table so long as the conductors are not close to each other, except that they may run close together for a short distance, such as may be required when they enter or exit an enclosure.
Did that help?
Welcome to the forum.
(1) The ampacity of a conductor will depend on its ability to reject heat to its environment, that
(2) Conductors in close proximity with each other will interfere with the heat rejection process, and that
(3) Short run of conductors that are close to each other will not have as much impact as having the entire run being close to each other.
So what this is telling me is that I can use the ampacity numbers in the table so long as the conductors are not close to each other, except that they may run close together for a short distance, such as may be required when they enter or exit an enclosure.
Did that help?
Welcome to the forum.
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