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 Answers are based on the 2014 NEC.

Article 110 OF the National Electrical Code (NEC) covers general requirements for the examination and approval, installation and use, access to and spaces about electrical conductors and equipment; enclosures intended for personnel entry; and tunnel installations.

Ambient temperature correction adjustments relating to conduits exposed to sunlight on rooftops were inserted into the 2008 National Electrical Code (NEC) as new subsection 310.15(B)(2)(c) with accompanying Table 310.15(B)(2)(c).

This article is the third part in a series that provides a review of the more significant revisions and new requirements included in the 2017 edition of the National Electrical Code (NEC). This part provides a review of some significant changes in the articles in Chapter 2, Wiring and Protection.

More on Codes & Standards

Entries into Raintight Enclosures, Derating NM-B C

Cables in metal framing member Q: Sections 320.17 and 330.17 require that Types AC and MC cables be installed to comply with 300.4.

Branch-Circuit, Feeder and Service Calculations, Part II

An essential part in the life of an electrician is performing load calculations. Determining what size conductors and overcurrent protective devices to install is something most electricians do on a daily basis.

Household Applications and the Code

Providing branch-circuit overcurrent protection and subdividing electrical resistance-heating elements in appliances and fixed electric space heating equipment has been a long- standing requirement in the National Electrical Code (NEC).

Branch-Circuit, Feeder and Service Calculations

220.1 Scope Understanding how to perform load calculations is an important part of an electrician’s professional career. Before obtaining a permit, some jurisdictions require paperwork showing load calculations for services and feeders.

Mission Critical

A new article has been proposed for the 2008 National Electrical Code (NEC) covering mission-critical electrical systems installed in vital infrastructures or facilities where, if the infrastructure or facility was either destroyed or incapacitated, disruption of the facility would affect national

Assembly Occupancies, Overcurrent Protection and More

Electric service for grounding-electrode conductors Q: The electric utility in our area requires the installation of a ground rod and grounding-electrode conductor in the meter socket. Is it acceptable to ground the grounded-circuit conductor (neutral) in the service-disconnect enclosure?

AC and MC Bushings, Outdoor Receptacles and More

AC and MC bushings Q: Sections 320.17 and 330.17 indicate that Types AC and MC cables must be installed in accordance with 300.4, which includes protection of the cables by listed bushings or listed grommets that cover all metal edges of metal studs.