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.
 Arc-resistant switchgear

For my December 2005 column in ELECTRICAL CONTRACTOR, I wrote about the installation of parallel conductors in a metal wireway and the subsequent heating effects. These heating effects occur whether the parallel conductors are installed in a metal or nonmetallic wireway or in an auxiliary gutter.

Article 110 in 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 [110.1].

Special rules for ground-fault protection of equipment (GFPE) apply to healthcare facilities. Section 517.17(A) indicates that these GFPE rules apply to hospitals and other buildings (including multiple occupancy buildings) with critical-care space or where life-support equipment is used.

More on Codes & Standards

When to Supplement

A new definition covering supplementary overcurrent-protective devices has been added to Article 100 in the 2005 National Electrical Code (NEC) to indicate that limited protection may be provided for specific applications or utilization equipment.

Connecting Kitchen Hood Fans, Indoor Receptacles, and More

Laundry GFCI receptacles Q: Are all 15- and 20-ampere, 125V receptacles installed within six feet of a laundry or utility sink in a dwelling occupancy required to be protected by a ground fault circuit interrupter even where the receptacle is not readily accessible such as behind a clothes washer o

Pull and Junction Box Calculations

314.28 Pull and Junction Boxes Article 314 of the National Electrical Code (NEC) covers the installation and use of all boxes and conduit bodies used as outlet, device, junction or pull boxes.

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.