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.
 Grounding electrode
conductor termination


The first National Electrical Code (NEC) was developed in 1897. The National Fire Protection Association (NFPA) became the developer and publisher of the National Electrical Code (NEC) in 1911, and the NFPA continues to develop and publish the Code today.

New text in section 424.66(A) of the 2014 National Electrical Code (NEC) covers working space for electrical enclosures of resistance heating-element-type duct heaters mounted on air-duct systems in limited-access areas.

For many years, The National Electrical Code (NEC) has provided rules for equipment disconnects. NEC requirements are very specific for motors and motor-driven machinery, but they differ from lockout/tagout rules in NFPA 70E, Standard for Electrical Safety in the Workplace. The reason is simple.

More on Codes & Standards

 
Box-Fill Calculations, Part V

ARTICLE 314 C OUTLET, DEVICE, PULL AND JUNCTION BOXES; CONDUIT BODIES; FITTINGS; AND MANHOLES

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Box-Fill Calculations, Part IV

ARTICLE 314 C Outlet, Device, Pull and Junction Bozes, Conduit Bodies; Fittings; and Manholes 314.16(B) Box-Fill Calculations The National Electrical Code contains requirements for the numbers and sizes of conductors that can be installed in boxes and conduit bodies.

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Grounding a Meter Socket

Consider a typical 120/240V single-phase service with a separate cast meter socket and a rigid steel conduit nipple connecting the meter socket to the service equipment enclosure.

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Grounding Connections

The basis of grounding and bonding starts at the connection of a bonding jumper or an equipment-grounding conductor to a box, an enclosure or other electrical equipment and ends at the point of connection to the service-grounded conductor in a grounded system or at the service-equipment enclosure fo

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Box Fill Calculations, Part III

Article 314: Boxes, Conduit Bodies, Fittings and Manholes 314.16(A) Box Volume Calculations Article 314 of the National Electrical Code covers the installation and use of all boxes and conduit bodies used as outlet, device, junction or pull boxes depending on their use.

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Box Fill Calculations, Part II

Article 314: Boxes, Conduit Bodies, Fittings and Manholes

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Box Fill Calculations: Article 314: Boxes; Conduit Bodies; Fittings and Manholes

Article 314 of the National Electrical Code covers the installation and use of all boxes and conduit bodies used as outlet, device, junction or pull boxes, depending on their use.

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