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. 

Article 110 in the National Electrical Code (NEC) contains general requirements for electrical installations. Some of the topics covered include examination and approval, installation and use, and access to and spaces about electrical conductors and equipment.

A caller recently asked if all 125-volt (V), 15- and 20-ampere (A) receptacles in a commercial kitchen were required to be ground-fault circuit interrupter (GFCI) protected, even where part of a listed assembly.

The decision to install and operate an ungrounded system is typically a combined effort that includes a design or engineering team, the owner, the operators and sometimes the authority having jurisdiction.

Slash-rated breakers on 480V ungrounded delta?

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.
 Slash-rated breakers on 480V ungrounded delta?

More on Codes & Standards

Evolution of AFCIs and the <i>NEC</i>

ARC-FAULT CIRCUIT INTERRUPTERS (AFCIs) first made their appearance in the National Electrical Code (NEC) in 1999, with a mandatory effective date of Jan. 1, 2002. Research—conducted by Underwriters Laboratories Inc. (UL) for the U.S.

Out of the Shadows

Imagine an electrical contractor meeting a homebuyer at the builder’s sales office. The contractor walks through the plans for the new house and asks the homeowner for a description of his lifestyle, the way he wants to use his home, what he expects it to be able to do.

From Concept to Punch List

Design/build has grown from 5 percent of nonresidential construction 20 years ago to more than 40 percent today.

Protection for MC Cable, Receptacles in Patient Care Areas and More

Protection for Type MC cable Q:Why does the National Electrical Code (NEC) require physical protection for Type MC cable where installed less than 1.25 inches from the surface for runs that are parallel to metal framing members, but this clearance is not required where the cable is pulled through pr

Design/Build in the Public Sector

The use of design/build as a project delivery system continues to grow in the United States. However, the adoption of design/build in the public sector has lagged the private sector since its rediscovery in the 1990s.

A Brilliant Future

The U.S. market for ballasts ranges from about 77 to 100 million units for electronic and magnetic fluorescent devices.

Branch-Circuit, Feeder and Service Calculations, Part VI

220.14 Other Loads—All Occupancies Load calculation requirements are in Article 220 of the National Electrical Code (NEC). This article provides requirements for calculating branch-circuit, feeder and service loads. Article 220 is divided into five parts.