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. 

Article 210 in the National Electrical Code (NEC) covers branch circuits, with the exception of circuits that supply motor loads only. Article 430 covers these branch circuits, and Part II covers motor-circuit conductors.

A reader wrote in that an inspector had turned down one of his projects, citing the installation was in violation of National Electrical Code (NEC) 517.13(A) and (B) because Type MC cable was installed in the patient-care areas.

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.
 Kitchen countertop receptacle height


Many of the articles I write for ELECTRICAL CONTRACTOR originate as questions from people who read my columns or attend my workshops.

More on Codes & Standards

 
Enforcing and Administering the NEC
by Staff |

The National Electrical Code (NEC) enjoys the reputation of being the most widely accepted standard in the world. The document is intended to provide for the practical safeguarding of persons and property from hazards associated with electrical installations.

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Surpassing Standard Overload Protection
by Staff |

"What is the full load current of that motor over there?” “Which current rating do you want? Each motor has three current ratings: nameplate, NEC Table, and locked rotor.”

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Equipotential Plane and Voltage Gradients in Agricultural Settings and Raised Floors in IT Rooms
by Staff |

This month’s column addresses two rather different, recurring subjects on Electrical Contractor magazine’s “Online Code Question of the Day.” QUESTION: When building a barn for horses, I was required to establish an equipotential ground plane at the entrance, from the concrete floor of the barn to t

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Article 370-Boxes, Conduit Bodies and Fittings
by Staff |

An enclosure that contains a device(s), or supports a fixture(s) or other equipment can be supported by the entering raceways when all of the following conditions are met: 1) the enclosure does not exceed 100 cubic inches in size; 2) the enclosure has threaded entries or hubs identified for the purp

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Grounding Electrode Connections, Bonding around Swimming Pools, Sizing the Neutral Conductor, and More
by Staff |

CODE CITATIONS Article 250—Grounding; Article 310—Conductors for General Wiring; Article 410—Lighting Fixtures, Lampholders, Lamps, and Receptacles; Article 501—Class I Locations; and Article 680—Swimming Pools, Fountains, and Similar Installations Grounding electrode connections

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Improperly Sized Conduit Bodies Can Lead to Conductor Damage
by Staff |

The requirements for the construction and installation of conduit bodies are mixed with those for boxes and fittings in Article 370 of the National Electrical Code (NEC).

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Branch Circuits, Feeders, Service Calculations, Motors, Motor Circuits, Controllers, and More
by Staff |

CODE CITATIONS Article 210—Branch Circuits; Article 220—Branch-Circuits, Feeder, and Service Calculations; Article 225—Outside Branch Circuits and Feeders;

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