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 2017 NEC.
 Supporting Type MC cable

In the past few months, I have received emails and phone calls from electrical inspectors and contractors stating there is confusion in their areas concerning swimming pool equipotential bonding. They requested that I clarify the bonding requirements for swimming pools.

Thanks to the work of numerous dedicated individuals, there is a 2017 edition of the National Electrical Code (NEC). This 54th version has been available since August. These days, the Code is revised every three years, but the revision cycle has ranged from one to four years.

This article reviews changes in Chapter 4, Equipment for General Use, in the 2017 edition of the National Electrical Code (NEC).
 422.16(B)(2) Built-in Dishwashers and Trash Compactors

More on Codes & Standards

Unplugging Fluorescents

With the acceptance of the 2005 National Electrical Code (NEC), installing and servicing fluorescent luminaires (fixtures) has become a complex situation. The design and layout of the lighting system is critical in determining certain required added features.

Parallel Conductors, Bathroom Circuits and More

Q: Does the National Electrical Code permit Class 2, Class 3 and telephone conductors to be installed in the same bored hole in a wooden stud with Type NM or Type AC cable operating at 120V?

Box-Fill Calculations, Part XII

314.16 Number of Conductors in Outlet, Device, and Junction Boxes, and Conduit Bodies The scope of Article 314 is covered in 314.1 and covers requirements pertaining to the installation and use of all boxes and conduit bodies used as outlet, device, junction or pull boxes, depending on their use, a

Being Selective

Selective coordination has been a requirement in the National Electrical Code (NEC) for many years but has been limited to a few required applications.

Standard Procedure

Since the beginning of fiber optics, groups such as the Telecommunications Industry Association (TIA) have worked to create standards. Standards are mandatory for technologies to move from R&D to large-scale commercial applications.

Fire Stopping: What Every Contractor Needs to Know

For approximately 40 years, unprotected or improperly protected penetrations have presented a subject of much concern to the fire-protection community. In 1996, an electrical fire occurred at 30 Rockefeller Plaza in New York City.

Box-Fill Calculations, Part XI

314.16 Number of Conductors in Outlet, Device, and Junction Boxes, and Conduit Bodies The National Electrical Code contains provisions that limit the numbers and sizes of conductors that can be installed in boxes and conduit bodies.