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.
 Electrical systems expansion


Historically, the National Electrical Code (NEC) has required much of the electrical equipment, wiring methods and other electrical parts used in the electrical industry to be listed.

Section 110.26 of the National Electrical Code (NEC) requires specific minimums for working space around electrical equipment. Section 110.26 is divided into six subsections, and some of them contain even more subsections.


Every three years, the National Electrical Code (NEC) is revised and often expanded. As the 2017 NEC development cycle comes to a close, the final stages of the process unfold.

More on Codes & Standards

 
You Say Potato, I Say Tomato?

The International Electrotechnical Commission (IEC) documents use a totally different nomenclature to describe the electrical potential between phase conductors and earth than the National Electrical Code (NEC).


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After All These Years

Adequacy of reducing washers questioned When removing concentric or eccentric knockouts from a sheet-metal enclosure, it sometimes happens that a larger size than desired comes out or the only available knockout is larger than needed.


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Transformer Protection, Disconnecting Means and More

Article 100                Definitions Article 210                Branch Circuits Article 240                Overcurrent Protection Article 250                Grounding and Bonding Article 310                Conductors for General Wiring Article 404                Switches Article 410              


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Avoid Acceptance Test Failures

Understand related systems and learn important cues Why do many contractors continue to avoid scheduling the fire alarm system installation inspection? Is it because they know the system might fail the acceptance test and, as such, would thereby delay occupancy?


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GFCI Protection, Conductors and More

Article 210                Branch Circuits Article 240                Overcurrent Protection


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Shelter from the Storm

The gray area of electrical outlet installation Several problems arise when installing an outlet box on the exterior of a building.


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