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.
 Previous use of gray conductors


Article 310 in the National Electrical Code (NEC) covers general requirements for conductors and their type designations, insulations, markings, mechanical strengths, ampacity ratings and uses.

A recent change in the 2014 National Electrical Code (NEC) creates a new method for determining the size of service and feeder conductors for 120/240-volt (V), single-phase services for one-family, individual units of two-family dwellings, and individual units for multifamily dwellings.

The 2014 National Electrical Code (NEC) has new requirements for field-applied hazard warning markings, signs and labels. Throughout the NEC, rules that required signs, labels and other markings also required a specific signal word be included in the sign, label or marking.

More on Codes & Standards

 
Grounded Conductor ID, Outside Branch Circuits and Feeders, Services, Lighting Fixtures, and More
by Staff |

CODE CITATIONS Article 200—Use and Indentification of Grounded Conductors; Article 225—Outside Branch Circuits and Feeders; Article 230—Services; Article 250—Grounding; Article 410—Lighting Fixtures, Lampholders, Lamps, and Receptacles;

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Splices and Conductor Fill in Enclosures and Wireways
by Staff |

The conductor fill requirements for a conduit or an outlet box are calculated in the field on a regular basis.

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NEC and OSHA Add to Confusion about GFCIs
by Staff |

Ground fault circuit interrupters (GFCIs) have been around since the early 60s, yet there is much confusion about their use and how they operate.

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Flexible Metal Conduit Length, Use of the Term 'Tap' Conductor for High-temp Wires
by Staff |

Since the 1940 National Electrical Code (NEC), there has been a requirement that recessed incandescent fixtures be connected by wire having insulation suitable for the temperature.

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Overcurrent Protection for Motor Installations, Part II
by Staff |

This month’s column will continue with questions and answers relating to overcurrent protection for conductors in motor and controller circuits and overload protection for motors.

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Article 370 - Outlet, Device, Pull and Junction Boxes, Conduit Bodies and Fittings, Part III
by Staff |

Box Fill Calculations, Part I, appearing in June’s issue, introduced box fill, with emphasis on Section 370-16(a). Notably, Table 370-16(a) is used to determine the maximum number of conductors (for sizes No. 18 through No. 6) permitted within common-size metal boxes.

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