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

 
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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CODE Q &A
by Staff |

CODE CITATIONS: Article 100-Definitions; Article 110-Requirements for Electrical Installations; Article 210-Branch Circuits; Article 220-Branch-Circuit, Feeder, and Service Calculations; Article 373-Cabinets, Cutout Boxes, and Meter Socket Enclosures; Article 400-Flexible Cords and Cables; Article 4

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Defining Effective Grounding in Article 250
by Staff |

In the 1999 National Electrical Code (NEC), and particularly in Article 250, the words "effective" and "effectively" are frequently used in relation to grounding and bonding.

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To Ground or Not to Ground-That Is the Question
by Staff |

If there is one common thread throughout the electrical industry, it seems to be centered on grounding and bonding. Article 250 provides many of the requirements for grounding and bonding but is still difficult to understand.

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