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. 

by
Staff  

The National Electrical Code (NEC) requires all boxes and enclosures—including transfer switches, generators and power panels that are part of an emergency system—to be marked so they are readily identifiable as a component of the emergency system.

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.
 Pull boxes for communications cable


Article 110 in the National Electrical Code (NEC) covers general requirements for the examination and approval, installation and use, and access to spaces about electrical conductors and equipment; enclosures intended for personnel entry; and tunnel installations (110.1).

The DC Task Group of the NEC Correlating Committee is proposing three new articles for the 2017 edition of the National Electrical Code (NEC). The first is Article 706, covering energy-storage systems (ESS). The second is Article 710, covering microgrids.

Electrical Contractor Magazine

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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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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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