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. 

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 Answers are based on the 2014 NEC.

Article 110 OF the National Electrical Code (NEC) 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.

Ambient temperature correction adjustments relating to conduits exposed to sunlight on rooftops were inserted into the 2008 National Electrical Code (NEC) as new subsection 310.15(B)(2)(c) with accompanying Table 310.15(B)(2)(c).

This article is the third part in a series that provides a review of the more significant revisions and new requirements included in the 2017 edition of the National Electrical Code (NEC). This part provides a review of some significant changes in the articles in Chapter 2, Wiring and Protection.

More on Codes & Standards

AFCIs Now More Integral

This article returns to the topic of my December 2013 column, which dealt with some of the changes that occurred to 210.12 for arc-fault circuit interrupters (AFCI) in the 2014 National Electrical Code (NEC), such as the expansion of AFCI devices to include circuits for kitchens and laundry equipmen

Vampires, Phantoms and Energy Hogs

At a recent National Electrical Code (NEC) update seminar, 
I was asked about the new requirements to install a grounded (neutral) conductor in a box for switches that control lighting loads.

Reliability Of Service, Lockable Disconnect And More

Editor’s note: Jim Dollard is our new Code FAQs columnist. While he has big shoes to fill after Charlie Trout’s retirement, he has an extensive background in codes and standards. He also has a new email address for you to send in your questions:

Sizing Conductors, Part XXXII

With a lot of work from many dedicated individuals, the 2014 edition of the National Electrical Code (NEC) became available at the end of August 2013. The Code is revised every three years, but the revision cycle has not always been three years. Revision cycles have ranged from one to four years. 

Stay Dry

I made a comment while teaching a class that nonmetallic (NM) cable was not permitted in an outdoor, wet location. An attendee took exception to that statement and asked me to provide National Electrical Code (NEC) justification for the assertion.

Equipment Or Building?

At some properties, a single electric utility service supplies multiple buildings or structures. The service could directly supply one of the buildings, and feeders or branch circuits supply other buildings from that service equipment.

The Best Of Code Question Of The Day, Part III

Charlie Trout, author of Code FAQs and Code Question of the Day, has retired. Enjoy these highlights from his past responses. Sealing conduit that passes into refrigerated room