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. 

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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.
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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

 
Installing Outlet Boxes with Lighting Fixtures

Call me old-fashioned, but I have long held the opinion that, in a dwelling unit, an outlet box must be installed wherever a lighting fixture is to be installed.

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Electrical Installation Requirements, Conductors for General Wiring, Flexible Cords and Cables, Appliances, and Fire Pumps

CODE CITATIONS Article 110—Requirements for Electrical Installations Article 230—Services Article 310—Conductors for General Wiring Article 400—Flexible Cords and Cables Article 422—Appliances Article 695—Fire Pumps

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Temperature Limitations of Connections Must Not Be Exceeded

The temperature rating associated with the ampacity of a conductor must be selected and coordinated so that the lowest temperature rating of any conductor, equipment termination, or electrical device is not exceeded.

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Branch Circuit, Feeder, and Service Calculations; Overcurrent Protection; Grounding; IT Equipment; and Water-intensive Installations

CODE CITATIONS Article 210—Branch Circuits; Article 220—Branch-Circuit, Feeder, and Service Calculations; Article 240—Overcurrent Protection; Article 250—Grounding; Article 645—Information Technology Equipment; and Article 680—Swimming Pools, Fountains, and Similar Installations

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Understanding Snap Switch Installation Requirements

Switching devices are often installed without reading installation instructions or without understanding certain concepts involved in the safe installation of these devices.

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Grounding Separately Derived Systems

Last month, we reviewed the basic requirements for grounding separately derived systems in accordance with Article 250 of the National Electrical Code (NEC). This month, we will explore a proposed 2002 Code change and how it might impact safety. 2002 NEC proposal

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