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.
 GFCI protection of dishwashers 
in dwelling units 


Article 210 in the National Electrical Code (NEC) covers branch circuits, except when they supply only motor loads, which Article 430 covers. When sizing conductors for branch circuits, it is necessary to comply with the provisions in Article 210.

My last article provided a history and background on Article 400, dealing with flexible cords and cables. This month, I delve further into whether flexible cords and cables could or should be installed in concealed locations.

In a recent training presentation, a question came up about the new identification requirements for automatically controlled receptacles. Does the marking need to be on the receptacle face, or is a marking on the faceplate in compliance?

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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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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