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 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.

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


More on Codes & Standards

 
Safely Installing Electrical and Service Panels in Residential Closets
by Staff |

This month’s column addresses controversial issues that have come up in NECA’s online “Code Question of the Day.” The author gives his opinion in his answers and invites your comments on the material discussed. Please e-mail your comments to brooke@necanet.org.

READ MORE
 
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

READ MORE
 
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).

READ MORE
 
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.

READ MORE
 
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.”

READ MORE
 
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

READ MORE

Pages