Codes & Standards

 

Essential to the work of the electrical contractor is knowledge of the National Electrical Code, the National Electrical Installation Standards and additional standards and codes administered by the National Fire Protection Association, the Occupational Safety and Health Administration and others. Here is a list of all our articles on codes and standards listed chronologically by issue date. 

Grounding methods and requirements for systems operating at more than 1,000 volts (V), such as 5- and 15-kilovolt (kV) systems, differ slightly from those for systems of 1,000V or less. Systems in these voltage ranges are commonly referred to as medium-voltage systems.

GFCI in locker rooms


Jim Dollard has an extensive background in codes and standards. If you have a query about the National Electrical Code (NEC), Jim will help you solve it. Send questions to codefaqs@gmail.com. Answers are based on the 2017 NEC.
 GFCI in locker rooms


Those of us who use the National Electrical Code (NEC) on a regular basis and are familiar with the words as well as the intent of the text can often overlook the most obvious interpretations by the rest of the electrical industry.


National Electrical Code (NEC) Article 110 covers general requirements for the examination and approval, installation and use, access to and spaces about electrical conductors and equipment; enclosures intended for personnel entry; and tunnel installations.

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Study Shines New Light on Old Problems Behind the Walls

In the decades since the U.S. Consumer Product Safety Commission determined that electrical fires are disproportionately frequent in homes more than 40 years old, a generation of houses has aged into the danger zone.


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Bonding Hydromassage Tubs, Wet Locations and More

Article 300 Wiring Methods; Article 310 Conductors for General Wiring; Article 410 Luminaires, Lampholders, and Lamps; Article 440 Air-Conditioning and Refrigerating Equipment; Article 517 Health Care Facilities; Article 680 Swimming Pools, Fountains, and Similar Installations; Article 700 Emergency


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Keep It Covered

In many states, laws exist that allow the electrical contractor to design fire alarm systems for projects he is selling and installing for a customer.


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Color of conductors, Taper-Resistant Receptacles and Mor

Article 210 Branch Circuits; Article 250 Grounding and Bonding; Article 300 Wiring Methods; Article 310 Conductors for General Wiring; Article 408 Switchboards and Panelboards; Article 430 Motors, Motor Circuits, and Controllers Grounding isolated EGCs


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Branch-Circuit, Feeder and Service Calculations, Part XXIX

The National Electrical Code (NEC) contains an introduction, nine chapters and eight annexes. Article 90 is the introduction to the NEC. This article contains specifications that are essential to all chapters and sections in the Code.


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Semantics

A seemingly simple change in the 2008 National Electrical Code (NEC)— prompting revisions or deletions of text for municipal, county or state NEC adoption processes relating to the installation of exposed nonmetallic-sheathed (NM) cable in a dwelling unit crawl space—has upset some people in the ele


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