The National Electric Code is updated yearly and is usually adopted by a locality some years after release. You can check with your local license and permit office what version is in effect in your locale or ask an electrician. It contains the rules for all types of electric work.
In the United States, the NEC is updated every 3 years on a very strict schedule and it is adopted by local jurisdictions at their discretion. It is not a government document until it is adopted by someone. The most recent update is the 2011 version. I know that Master Electrician tests are not yet based on it. Depending on the jurisdiction you may find a version as old as the 1999 NEC still in effect.
In the United States the National Electrical Code, or NEC, is the standard for most electrical installations. It is a document prepared by the National Fire Protection Association which is not a government organization. The NEC becomes a set of government requirements when a government entity, often a city or county, adopts the NEC as its standard.
The National Electrical Code does not specifically address whether you can have power outlets on a 2-hour fire-rated wall. However, you should consult with a qualified electrician to ensure that any electrical work done on a fire-rated wall complies with local building codes and fire safety regulations.
Article 250 of the National Electrical Code covers grounding.
You can obtain a copy of local electrical codes from your city or county's building department, or online through their website. Additionally, you can visit the National Fire Protection Association (NFPA) website for access to the National Electrical Code (NEC), which serves as a model code for electrical work across the United States.
The value of a 1897 National Electrical Code book can vary widely depending on its condition, rarity, and demand among collectors. Generally, an antique electrical code book in good condition can be worth anywhere from $50 to a few hundred dollars. It's recommended to consult with a rare book dealer or an antique book appraiser for a more accurate valuation.
National Electrical Code
role of national electric code in the design of electrical installation
NFPA 70
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.
In the USA, the National Electrical Code is NFPA 70. There are several national fire codes, including National Fire Code (also called Uniform Fire Code); NFPA 1 (National Fire Protection Association) and the International Fire Code (International Code Council). Each of these references hundreds of other codes and standards, including Life Safety Code, Building Code, Electrical Code, etc.
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.
National Fire Protection Association (NFPA).
National Electrical Code (NEC)
The most current edition of the National Electrical Code. At this time it is "NEC 2008."
The national electrical code is a publication thet governs commercial, residential and industrial electrical installations. Article 250 is the section governing grounding and bonding installations.