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. 

This is the final part in a series that reviews some of the more significant revisions and new requirements included in the 2017 National Electrical Code (NEC). This article looks at more rule changes for special equipment covered in NEC chapters 7 and 8.

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.

More on Codes & Standards

 
Branch-Circuit, Feeder and Service Calculations

220.1 Scope Understanding how to perform load calculations is an important part of an electrician’s professional career. Before obtaining a permit, some jurisdictions require paperwork showing load calculations for services and feeders.


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AC and MC Bushings, Outdoor Receptacles and More

AC and MC bushings Q: Sections 320.17 and 330.17 indicate that Types AC and MC cables must be installed in accordance with 300.4, which includes protection of the cables by listed bushings or listed grommets that cover all metal edges of metal studs.


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Pull- and Junction-Box Calculations, Part VIII

314.28 Pull and Junction Boxes Requirements pertaining to the installation and use of all boxes and conduit bodies used as outlet, device, junction or pull boxes are in Article 314 of the National Electrical Code (NEC).


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Only Temporary

Recent discussions on ground-fault circuit interrupter (GFCI) protection for personnel on construction sites have indicated that there seems to be a misunderstanding of whether generator power is excluded from the GFCI requirement.


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Transformer Sizes, Metal Clad Cables and More

Outside feeder grounding and bonding Q: What grounding and bonding requirements apply to an outside feeder that supplies a woodworking hobby shop that is located in a detached building and is about 60 feet from, and supplied from, a single-family residence?


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Pull- and Junction-Box Calculations, Part VII

314.28 Pull and Junction Boxes Chapter 3 of the National Electrical Code (NEC) covers wiring methods and materials. Article 314 covers the installation and use of all boxes and conduit bodies used as outlet, device, junction or pull boxes, depending on their use.


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Now Hear This

Within the past few years, many of us have installed surround sound systems in homes and business. What seems to be lacking is an understanding of the new requirements that have been incorporated into the totally revised Article 640 in the National Electrical Code (NEC).


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