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. 

Point of supply


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.
 Point of supply


The model building code treats campus dormitories as residential occupancies. However, a dorm does not function the same as a commercial apartment building. In some cases, the architect has created a physical design to accommodate as many students as possible.

Are multiwire branch circuits becoming antiquated for most new installations, or are they still being used in most circuit applications?

The National Electrical Code (NEC) is divided into an introduction and nine chapters with 10 informational annexes. As specified in 90.5(D), the informative annexes are not part of the NEC’s enforceable requirements but are included for informational purposes only.

Electrical Contractor Magazine

More on Codes & Standards

 
Pull- and Junction-Box Calculations, Part V

Provisions pertaining to the installation and use of all boxes and conduit bodies used as outlet, device, pull and junction boxes are in Article 314 of the National Electrical Code. Section 314.16 covers provisions for sizing boxes and conduit bodies containing conductors 18 AWG through 6 AWG.

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In the Interim

The May 2005 Code Applications column contained information on a major change in Article 680 for the 2005 National Electrical Code (NEC) concerning the construction requirements of fiberglass pools, vinyl-lined pools and concrete pools containing epoxy-coated rebar.

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Pull- and Junction-Box Calculations, Part IV

314.28 Pull and Junction Boxes The National Electrical Code covers outlet, device, pull and junction boxes; conduit bodies; fittings; and handhole enclosures in Article 314.

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Emergency Protection ... Stat!

Providing mechanical protection for branch circuits supplying critical loads in a hospital is extremely important. Any potential damage to these circuits could cost lives.

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Grounding Electrodes, SE Cables and More

Fire pump disconnecting means Q: Is the disconnect for an electric motor driving a fire pump required to be within sight of the motor or is it permitted to be out of sight if capable of being locked in the off position? Can the disconnect and overcurrent protection be located in a panelboard?

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Panelboards in Stairways, Color Coding and More

Control-circuit transformers Q: Do the requirements of Article 450—Transformers and Transformer Vaults or Article 725—Class 1, Class 2 and Class 3 Remote-Control, Signaling, and Power-Limited Circuits apply to a control-circuit transformers in a 480-volt combination motor starter?

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Pull- and Junction-Box Calculations, Part III

314.28 Pull and Junction Boxes Requirements pertaining to the installation and use of all boxes and conduit bodies used as outlet, device, junction or pull boxes are in Article 314 of the National Electrical Code.

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