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.
 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

PV Installation: Codes and Standards

The installation of photovoltaic (PV) equipment is governed by a number of industry codes and standards. Electrical contractors need to be aware of the codes and standards to ensure a safe and functional PV installation.

Use the Service Entrance

The text in Section 230.40 covering the number of sets of service-entrance conductors for each service drop or lateral has not changed since it was accepted into the 1984 National Electrical Code (NEC).

Avoiding the Pitfalls

According to the Design-Build Institute of America (DBIA) “Design-Build is a process that has been embraced by the world's great civilizations. In ancient Mesopotamia, the Code of Hammurabi (1,800 BC) fixed absolute accountability upon master builders for both design and construction.

Box-Fill Calculations, Part X

314.16 Number of Conductors in Outlet, Device, and Junction Boxes, and Conduit Bodies The National Electrical Code has specific requirements detailing how to calculate the maximum number of conductors in boxes (outlet, device, junction, etc.) and conduit bodies.

New Method to Protect Circuits

Arc-fault circuit-interrupter(AFCI) protection requirements were first submitted to the National Electrical Code (NEC) process for the 1996 NEC but were not accepted until the 1999 NEC.

Box-Fill Calculations, Part IX

314.16 Number of Conductors in Outlet, Device, and Junction Boxes and Conduit Bodies Section 314.1 covers the scope of Article 314. This article covers the installation and use of all boxes and conduit bodies used as outlet, device, junction or pull boxes, depending on their use.

Safety Horizon: 70E Standard

Twenty-five years ago, the National Fire Protection Association (NFPA) first prepared a set of standards to ensure electrical workers were safe on their jobs. So why has this standard-known as the NFPA 70e-suddenly become such a big deal?