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.

More on Codes & Standards

 
Round Up or Round Down

When instructing workshops for electricians, I have found that some of the participants get very confused about how the National Electrical Code (NEC) addresses the rounding up or rounding down of the size of an overcurrent protection device (OCPD) to allow a motor to start and accelerate its drive


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The Sounds of Crisis

For many years, the audibility and intelligibility of fire alarm signals were ignored. Traditionally, a contractor or designer would put one audible/visible appliance above each manual fire alarm box (pull station) and maybe one or two more in the hallway.


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No Way Out

I have found while teaching the 2008 National Electrical Code (NEC) that the electrical industry has mixed feelings concerning the changes that pertain to the installation of receptacles.


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Overcurrent Protection, Tamper-Resistant Receptacles and More

Article 210 Branch Circuits; Article 220 Branch Circuit, Feeder, and Service Calculations; Article 240 Overcurrent Protection; Article 250 Grounding and Bonding; Article 330 Metal-Clad Cable: Type MC; Article 422 Appliances; Article 450 Transformer and Transformer Vaults (Including Secondary Ties)


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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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