Yep, that's the one. The first edition came out way back before 1900. We're now on the 16th edition, but in between each major new version there are usually several supplements and reprints issued.
The Regs. ARE generally accepted as good practice in the industry (even though some are disputed), and many commercial contracts specify that wiring must follow the Regs. My point about them was that there is no legal obligation to do so, except in a few special cases.
There are apprenticeships, and we do have several trade organizations which offer certification. Some employers may require this as a condition of employment, but there is no legal obligation for the self-employed to go this route. I'm involved nostly with residential wiring, and Mr. Average Citizen who wants an extra wall-light has never heard of such certification anyway.
For that reason, the lack of licensing, and the expense (so I've been told), I've never bothered to become certified, so I'm not sure exactly what it entails. I will say, however, that I have seen a lot of work done by those holding such certificates that would make Moe, Larry, and Curly seem quite competent, hence my caution about the whole license/permit issue.
