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.
 Grounding electrode
conductor termination


The first National Electrical Code (NEC) was developed in 1897. The National Fire Protection Association (NFPA) became the developer and publisher of the National Electrical Code (NEC) in 1911, and the NFPA continues to develop and publish the Code today.

New text in section 424.66(A) of the 2014 National Electrical Code (NEC) covers working space for electrical enclosures of resistance heating-element-type duct heaters mounted on air-duct systems in limited-access areas.

For many years, The National Electrical Code (NEC) has provided rules for equipment disconnects. NEC requirements are very specific for motors and motor-driven machinery, but they differ from lockout/tagout rules in NFPA 70E, Standard for Electrical Safety in the Workplace. The reason is simple.

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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