Hi all,
Been a while since I have posted.
I have a small disagreement with a fellow contractor. The question at hand is
Is it compliant to use #8 THHN on a 50 amp breaker given the de-rating due to continuous load as we must follow her in CA?
Oh and the length of the run is under 90 feet so voltage drop should be fine.
Thanks
2023 NEC
The rules for condition of usage for T.310.16 are found in its caption and the 3 accompanying foot notes are found in that table.
Additionally, to understand how to apply those rules you must use the Code sections and related tables that are found in those foot notes.
Those footnotes and those sections/ tables refer to and support T.310.16 or vice versa.
Example: Think of the conductors for a s
ervice, a
branch circuit and a
feeder as kind of a loop. Those are the basic three essentials of an electrical system.
So, here are three Code sections that would apply to your question about" de-rating" and continuous loads in the 2023 NEC.
Here's the loop:
(1) Branch circuits 210.19 (A) (1) and (2)..."not less than the maximum load to be served after....."
(2) Feeders 215.2 (A) (1) and (2) "...not less than the maximum load to be served after..."
(3) Services 230.42 (A) (1) and (2) "...not less than the maximum load to be served..."
You will see that they all have the same standard that is common to them all.
Thanks for reading.
Comments accepted.
TX+MASTER #4544
