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. 

Point of supply


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 2014 NEC.
 Point of supply


The model building code treats campus dormitories as residential occupancies. However, a dorm does not function the same as a commercial apartment building. In some cases, the architect has created a physical design to accommodate as many students as possible.

Are multiwire branch circuits becoming antiquated for most new installations, or are they still being used in most circuit applications?

The National Electrical Code (NEC) is divided into an introduction and nine chapters with 10 informational annexes. As specified in 90.5(D), the informative annexes are not part of the NEC’s enforceable requirements but are included for informational purposes only.

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More on Codes & Standards

 
Service panel makeup

The Best Of Code Question Of The Day, Part I

Charlie Trout, author of Code FAQs and Code Question of the Day, has retired. 
For the rest of 2013, enjoy these snippets from his daily responses.
 Follow specs or nameplate?


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Sizing Conductors, Part XXIX

Article 240 in the National Electrical Code (NEC) is titled “Overcurrent Protection.” While this term is not defined, Article 100 defines overcurrent. Overcurrent is any current in excess of the rated current of equipment or the ampacity of a conductor.

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Clarification Required?

A friend of mine recently called with a question about the cover depth requirement for an underground 120-volt (V) lighting circuit installation in rigid polyvinyl chloride (PVC) conduit supplying a wet-niche luminaire in a swimming pool.

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Down to Earth About Grounding

Ben Franklin already knew enough about grounding to keep the portion of the kite string he was holding dry. Otherwise when the lightning streaked down the wet part of the line and hit the key, he might have received more than a mild shcok when he moved his hand near the key.

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Editors' Pick
2014 NEC Outlook, Part II

Part I of this series reviewed some Code-wide revisions and some of the significant changes in Chapter 1 of the National Electrical Code (NEC). This segment takes a look at some significant revisions in chapters 2 and 3 (with the comment or proposal number cited after each listing).

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Know Your Type: Branch-circuit wiring in patient care areas


Someone recently inquired about the proper wiring methods in a patient care location of a healthcare facility. A few factors relate to this determination.

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NM Cable In A Drop Ceiling, Terminals For Multiple Conductors And More

Editor’s note: Charlie Trout is moving on to retirement. This edition of Code FAQs will be the last collection of questions and answers he will provide. For the next few months, tune in for a “best of” series of Code Questions of the Day by Charlie. A new writer will be introduced in January.

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