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. 

As the 2017 NEC development cycle came to a close, we embarked on a ten-part series of articles and a two-part webinar detailing the most significant changes in the 2017 NEC. With the series concluded, this article collects each entry and both webinars into a single location.

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. Questions can be sent to codefaqs@gmail.com. Answers are based on the 2017 NEC.
 NFPA 70E and the NEC


Having adequate working space around electrical equipment is essential. Article 110 in the National Electrical Code (NEC) contains requirements for this access. Part II in Article 110 pertains to systems rated 1,000 volts (V), nominal, or less.

Anyone who has attended a conference in a hotel or other meeting space knows there can be a lack of receptacles to provide power for portable equipment. Sometimes, extension cords or relocatable power taps are plugged into wall receptacles and daisy-chained together to provide power to tables.

More on Codes & Standards

 
Which Size Box?

An electrician asked me a very interesting question concerning the sizing of a junction or pull box and the difference between the two. They are basically the same. Electricians use junction and pull boxes as access points for pulling and feeding conductors through raceway systems.


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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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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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Between Compliance and Violation

A client requested that I inspect a generator installation that was determined to be the cause of a fire. The client’s concern was whether the installation identified as an optional standby system complied with the National Electrical Code (NEC).


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