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

 
Branch Circuits, Grounding, Flexible Metal Conduit, Motors, and Transformers
by Staff |

CODE CITATIONS Article 210—Branch Circuits; Article 220—Branch-Circuit, Feeder, and Service Calculations; Article 250—Grounding; Article 350—Flexible Metal Conduit; Article 410—Lighting Fixtures, Lampholders, Lamps, and Receptacles; Article 430—Motors, Motor Circuits, and Controllers; and

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Installing Electrical Equipment in a Combustible Dust Location
by Staff |

Article 502 in the National Electrical Code (NEC) covers the installation of electrical equipment in a combustible dust location.

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Safe Working Spaces around Electrical Equipment Allow Hasty Retreat
by Staff |

Over the past few months, we have discussed how good electrical design practice cannot and should not ignore the safety implications associated with the electrical installation.

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Is It Worth Removing the Exceptions?
by Staff |

Herewith, various 1999 National Electrical Code (NEC) issues that do not warrant a whole page of discussion. This is an example of why it is wrong to follow a “remove exceptions” edict without first examining the consequences. The 1996 NEC, Section 410-12 reads as follows:

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Panelboard Mounting Heights, Fire Pump Electric Service, A/C Overcurrent Protection and More
by Staff |

CODE CITATIONS Article 110—Requirements for Electrical Installations; Article 230—Services; Article 240—Overcurrent Protection; Article 350—Flexible Metal Conduit; Article 410—Lighting Fixtures, Lampholders, Lamps, and Receptacles; Article 430—Motors, Motor Circuits, and Controllers;

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Overcurrent Protection for Motor Circuits
by Staff |

There are many misconceptions in the field when dealing with motor circuits. Can the overcurrent protection device in the motor circuit be sized significantly larger than what is normally used to protect the circuit conductors?

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Call Before You Dig !!!
by Staff |

During the1999 National Electrical Code (NEC) cycle, Code-Making Panel 3 (CMP-3) accepted a revision to Section 300-5(d) that reads: “Service laterals that are not encased in concrete and that are buried 18 inches (457mm) or more below grade shall have their location identified by a warning ribbon t

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