Chapter 2: Document Structure and Numbering. There are numerous sub chapters too numerous to mention.
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Yes, they are required by the national electric code.
It does not
It is a electrical code rule taken from the National Electrical Code book. It has to do with multi wire branch circuits.
It is what the electrical code book in the United States is called. In questions and answers it is usually shortened to the letters NEC.
The most current edition of the National Electrical Code. At this time it is "NEC 2008."