Electrical Contractor Magazine

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.
 Type SE cable support


Article 240, in the National Electrical Code (NEC), provides general requirements for overcurrent protection and overcurrent protective devices.

For many years, Article 250, which covers grounding and bonding in the National Electrical Code (NEC), only contained two tables. Table 250.122 was used for sizing the equipment grounding conductors, based on the size of the overcurrent protective device in the circuit.

Energy management is becoming commonplace in today’s electrical infrastructures through the control of utilization equipment, energy storage and power production. Yet, limited consideration is found in electrical installation standards to actively manage these systems.

Electrical Contractor Magazine

More on Codes & Standards

 
CODE QUESTIONS AND ANSWERS
by Staff |

Article 100-Definitions; Article 110-Requirements for Electrical Installations; Article 230-Services; Article 240-Overcurrent Protection; Article 250-Grounding; Article 305-Temporary Wiring; Article 695-Fire Pumps.

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OVERCURRENT PROTECTION FOR MOTOR INSTALLATIONS: PART ONE
by Staff |

This month's column concerns overcurrent protection for conductors in motor and controller circuits and overload protection for motors, subjects that many subscribers to our "Code Question of the Day" online feature have inquired about.

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Code Comments/Why Change a Good Thing?
by Staff |

Prior to and including the 1956 National Electrical Code (NEC) there was a limit of nine conductors in a raceway, except when used for control, stage lighting, elevators, and similar uses.

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Existing Rules Limit the Number of Conductors within a Box
by Staff |

Contrary to popular electrical opinion, designated rules limit the number of conductors allowed within outlet, device, and junction boxes. Unfortunately, all too often, electricians remove junction box covers only to find the box crammed full of conductors.

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Branch Circuit, Feeder, and Service Calculations, Motors and Their Circuits and More
by Staff |

CODE CITATIONS: Article 110-Requirements for Electrical Installations; Article 210-Branch Circuits; Article 220-Branch Circuit, Feeder, and Service Calculations; Article 230-Services; Article 250-Grounding; Article 310--Conductors for General Wiring; Article 430-Motors, Motor Circuits, and Controlle

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Confusion with On-site Generators
by Staff |

Two similar installations have been proposed recently. The first is a proposed large hotel on a mountaintop at a distance of several miles from the nearest utility distribution line, and in a location subject to frequent lightning storms.

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Clarifying the Fuzziness Surrounding 'Qualified Person' Language Requires Careful Examination
by Staff |

"In industrial establishments where the conditions of maintenance and supervision ensure that only qualified persons will service the installation..." Think about how many times the National Electrical Code (NEC) begins a requirement with these words.

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