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. 

Grounding methods and requirements for systems operating at more than 1,000 volts (V), such as 5- and 15-kilovolt (kV) systems, differ slightly from those for systems of 1,000V or less. Systems in these voltage ranges are commonly referred to as medium-voltage systems.

GFCI in locker rooms


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. Send questions to codefaqs@gmail.com. Answers are based on the 2017 NEC.
 GFCI in locker rooms


Those of us who use the National Electrical Code (NEC) on a regular basis and are familiar with the words as well as the intent of the text can often overlook the most obvious interpretations by the rest of the electrical industry.


National Electrical Code (NEC) Article 110 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.

More on Codes & Standards

 
Branch-Circuit, Feeder and Service Calculations, Part X

Maximum Loads: Last month’s Code in Focus concluded by covering loads for additions to existing installations; this month, the discussion continues with maximum loads as specified in 220.18.


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Twist-Lock Receptacles, Conductors and More

Included articles: Article 210—Branch Circuits; Article 230—Services; Article 250—Grounding and Bonding; Article 300—Wiring Methods; Article 310—Conductors for General Wiring; Article 314—Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures; Article 320—Armored


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Danger: High Voltage

Applying caution to electrical inspection: I could not do my job as an inspector if I couldn’t open doors and covers of energized equipment; when I came aboard, they gave me a screwdriver and a flashlight and turned me loose.


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Getting Started in Security

Bill yourself as code-compliant and follow the rules: Electronic security systems forecasts show continued industry growth; In fact, some studies indicate this $16 billion market will grow at an annual rate approaching 7 percent.


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Branch-Circuit, Feeder and Service Calculations, Part IX

Article 220—Load Calculations 220.14 Other Loads—All Occupancies Understanding how to perform load calculations is an important part of an electrician’s professional career.


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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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