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. 

During a recent National Electrical Code (NEC) training program, inquiries about ground-fault protection of equipment (GFPE) were raised.

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.
 Pull-through angle connectors?


Some photovoltaic (PV) inverter manufacturers have designed and built transformer-less inverters to add to their existing line of transformer-type inverters for installation in the United States. Transformer-less inverters have been popular in Europe for quite some time.

Article 430 of the National Electrical Code (NEC) covers motors, motor branch-circuit and feeder conductors, motor branch-circuit and feeder protection, motor-overload protection, motor-control circuits, motor controllers, and motor-control centers.

More on Codes & Standards

 
How Effective Is Overcurrent Protection in the Tap Rules?
by Staff |

The location in the circuit of the overcurrent protection permitted in the tap rules of Sec. 240-21 raises some questions regarding the effectiveness of the overcurrent protection.

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Article 370 - Pull and Junction Boxes
by Staff |

370-28(a)(2) Angle Pulls

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Classification of a Hazardous Location
by Staff |

The hazardous locations covered by Chapter 5 of the National Electrical Code (NEC) are classified in accordance with the properties of flammable liquids, gases, vapors, combustible dust, or ignitable fibers or flyings that may be present in the area where electrical equipment may be installed.

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Why Does the NEC Prohibit Overcurrent Device Installation in Clothes Closets?
by Staff |

February’s “Code Question of the Month” column addressed overcurrent device installation in clothes closets. The questions were: (1) May service equipment (overcurrent devices in a panelboard) be installed in a walk-in clothes closet?

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Motor Control Circuits: To Ground or Not to Ground?
by Staff |

Should motor control circuits be grounded? Here are some guidelines: If a motor control circuit is tapped from the motor circuit and does not leave the controller enclosure (the push buttons are in the cover), then it need not be grounded. [90-7 ¶ 2, 300-1(b), 450-1 Exc.No.2]

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Taming the Fire-Breathing Dragon
by Staff |

If you thought industry standards had pretty much solved the problem of electrical injuries and fatalities in the workplace, then you should know that is not the case.

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