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. 

The National Electrical Installation Standards (NEIS) are the only American National Standards Institute-approved performance and workmanship industry standards for electrical construction.

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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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As Section 110.2 States, The National Electrical Code (NEC) provides installation requirements for electrical conductors and equipment that are either required or permitted to be installed. However, these conductors and equipment are only acceptable if the installation is approved.

The second article in the National Electrical Code (NEC), Article 100, contains definitions that are essential to the proper Code application. Article 110 contains many requirements that are essential to understanding and applying requirements located throughout the Code.

More on Codes & Standards

 
Article 370 - Pull and Junction Boxes

Sizing requirements for boxes and conduit bodies used as pull or junction boxes are stipulated in Section 370-28. While the boxes within the scope of 370-16 are calculated from the sizes and numbers of conductors, boxes in 370-28 are calculated from the sizes and numbers of conduits (raceways).


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Overcurrent Protection, Access to Working Space, Snap Switches, and More

CODE CITATIONS Article 110—Requirements for Electrical Installations Article 240—Overcurrent Protection Article 250—Grounding Article 380—Switches Article 384—Switchboards and Panelboards Article 450—Transformers and Transformer Vaults


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Low-voltage Lighting - Listed Systems or Individual Field-assembled Components?

Does the National Electrical Code (NEC) require all lighting installations operating at 30 volts or less to be Listed systems? Can individual low-voltage lighting components, such as a power supply, fixtures, and conductors be assembled in the field without being part of a Listed system?


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How Effective Is Overcurrent Protection in the Tap Rules?

The location in the circuit of the overcurrent protection permitted in the tap rules of Sec. 240-21 raises some questions regarding the effectiveness of the overcurrent protection.


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Classification of a Hazardous Location

The hazardous locations covered by Chapter 5 of the National Electrical Code (NEC) are classified in accordance with the properties of flammable liquids, gases, vapors, combustible dust, or ignitable fibers or flyings that may be present in the area where electrical equipment may be installed.


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