I will try to shed a little light on why many will have a misunderstanding of what the NEC requires.
First we must look at article 90.3 to understand how the NEC is layed out, and also how articles can affect other articles:
90.3 Code Arrangement.
This Code is divided into the introduction and nine chapters, as shown in Figure 90.3. Chapters 1, 2, 3, and 4 apply generally; Chapters 5, 6, and 7 apply to special occupancies, special equipment, or other special conditions. These latter chapters supplement or modify the general rules. Chapters 1 through 4 apply except as amended by Chapters 5, 6, and 7 for the particular conditions.
So we can see that chapters, 5, 6, and 7 can supplement or modify requirements of chapters 1-4 we see this in the equal potential bonding of a pool, similar to the subject at hand.
Do we have to follow 250.102(E) for pool bonding? no because 680 is allowed to modify it, this is the same misunderstanding that you have with 517.14, it has its own requirements and modifies the requirement in chapter 2.
We must remember we are all here to learn, we must keep an open mind when we read these pages, the responses might not always be the correct one, but if you do the research (look up the answers) and present additional questions in the post, you can achieve the ultimate goal of finding the real answer. many of us try to get members to look things up on their own to better their learning rather then just give them an answer, it helps the answer to stick better into the brain.
But you must also approach all questions and answers with an open mind, always keep in the back of your mind what you have always thought was right might just not be, I hear the statement "we have done it that way for over 25 years" well it just means you may or may not have done it wrong over 25 years.
I have been on this board for a long time, I still get called out on opinions I have, and request to back it up, I don't get upset with this just because I know I can be wrong and it is a good method for me to learn the truth to the real answer.
Open Minds are a learning mind.
Closed minds have been blocked from learning anything more.
Which do you want to be?
Just a little note that I hope it can help some one down the line with learning.
Is this ceiling, where the #10 runs thru, a plenum?
