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 codefaqs@gmail.com. Answers are based on the 2014 NEC.
 Panelboards in cabinets?


Electrical overcurrent protective system Coordination can be complex and daunting. It is best approached with knowledge of the basics and proper system design.

Without very specific National Electrical code (NEC) rules for determining the right size conductor and the correct size overcurrent protective device, a conductor could overheat and even start a fire.

This article is part 4 in a series that reviews some of the more significant revisions and new requirements in the next National Electrical Code (NEC).

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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: codefaqs@gmail.com.



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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. 



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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.


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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.


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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



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Sizing Conductors, Part XXXI

Tap conductor rules are located in Article 240 in the National Electrical Code (NEC). A tap conductor (as used in Article 240) has overcurrent protection ahead of its point of supply that exceeds the value permitted for similar conductors that are protected as described elsewhere in 240.4 [240.2].


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AFCIs Settle Into Code

Installation requirements for arc-fault circuit interrupters (AFCI) in 210.12 of National Electrical Code (NEC) have been modified considerably in the past three NEC cycles and have changed dramatically in the 2014 NEC.


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