Great resource for the electrical industry. 2018 question, an understanding of knob and tube is helpful. Adding insulation into these concealed spaces not only created detrimental heat for the composite insulation on the conductors, but also created overheating for the solder joints. Hopefully our industry can continue to recruit these type nec pdf 2016 future Electrical Code Experts who are willing to pass down the information they are receiving.
Here in New Hampshire we have many really old buildings. NECA is the voice of the electrical contracting industry NATIONAL ELECTRICAL INSTALLATION STANDARDS, NEIS and the NEIS logo are registered trademarks of the National Electrical Contractors Association. NFPA 70, is a regionally adoptable standard for the safe installation of electrical wiring and equipment in the United States. The “authority having jurisdiction” inspects for compliance with these minimum standards. Work on the NEC is sponsored by the National Fire Protection Association. First published in 1897, the NEC is updated and published every three years, with the 2017 edition being the most current.
Most states adopt the most recent edition within a few of years of its publication. Those who fail to adhere to well known best practices for safety have been held negligent. The additional guidance is needed to clarify the current electrical code for these situations. The NEC also contains information about the official definition of HAZLOC and the related standards given by the Occupational Safety and Health Administration and dealing with hazardous locations such as explosive atmospheres. The NEC is available as a bound book containing approximately 1000 pages. It has been available in electronic form since the 1993 edition.
Although the code is updated every three years, some jurisdictions do not immediately adopt the new edition. The NEC is also available as a restricted, digitized coding model that can be read online but not saved, copied and pasted, or printed, free of charge on certain computing platforms that support the restricted viewer software. In the United States, statutory law cannot be copyrighted and is freely accessible and copyable by anyone. When a standards organization develops a new coding model and it is not yet accepted by any jurisdiction as law, it is still the private property of the standards organization and the reader may be restricted from downloading or printing the text for offline viewing. NEC without the registration that the NFPA requires.
External links to both the restricted NEC online access and free public access sites are referenced at the end of this article. The NEC is composed of an introduction, nine chapters, annexes A through J, and the index. The introduction sets forth the purpose, scope, enforcement and rules or information that are general in nature. Each code article is numbered based on the chapter it is in. Those wiring methods acceptable by the NEC are found in chapter 3, thus all approved wiring method code articles are in the 300s.
Efforts have been underway for some time to make the code easier to use. Some of those efforts include using the same extension in those code articles for the support of wiring methods. The explanations are only for reference and are not enforceable. Underwriters Laboratories, one of many of the testing laboratories recognized by OSHA. Many NEC requirements refer to “listed” or “labeled” devices and appliances, and this means that the item has been designed, manufactured, tested or inspected, and marked in accordance with requirements of the listing agency.
The 2008 Code has user-friendly features to aid the reader in seeing changes. Revisions or additions to the articles from the 2005 version are highlighted in gray shading. For circuits defined as low voltage, in some jurisdictions, there is no requirement for licensing, training, or certification of installers, and no inspection of completed work is required, for either residential or commercial work. The precise reasoning for the selection of 100 volts as the division between high and low is not clearly defined, but appears to be based on the idea that a person could touch the wires carrying low voltage with dry bare hands, and not be electrocuted, injured, or killed.