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.
 Unsupported raceways

National Electrical Code (NEC) Article 110, “Requirements for Electrical Installations,” applies generally to all electrical installations, like all of the articles located in the first four chapters.

Safety for solar photovoltaic (PV) systems has come a long way since the first installation requirements were inserted as Article 690 into the 1984 National Electrical Code (NEC).

In the electrical industry, a new method of protecting workers from arc energy is gaining popularity: prevention through design. Simply speaking, the design and installation of equipment or systems incorporates inherent safety features that protect workers from serious arc-flash injuries or death.

More on Codes & Standards

Enforcing and Administering the NEC

The National Electrical Code (NEC) enjoys the reputation of being the most widely accepted standard in the world. The document is intended to provide for the practical safeguarding of persons and property from hazards associated with electrical installations.

Surpassing Standard Overload Protection

"What is the full load current of that motor over there?” “Which current rating do you want? Each motor has three current ratings: nameplate, NEC Table, and locked rotor.”

Equipotential Plane and Voltage Gradients in Agricultural Settings and Raised Floors in IT Rooms

This month’s column addresses two rather different, recurring subjects on Electrical Contractor magazine’s “Online Code Question of the Day.” QUESTION: When building a barn for horses, I was required to establish an equipotential ground plane at the entrance, from the concrete floor of the barn to t

Article 370-Boxes, Conduit Bodies and Fittings

An enclosure that contains a device(s), or supports a fixture(s) or other equipment can be supported by the entering raceways when all of the following conditions are met: 1) the enclosure does not exceed 100 cubic inches in size; 2) the enclosure has threaded entries or hubs identified for the purp

Branch Circuits, Feeders, Service Calculations, Motors, Motor Circuits, Controllers, and More

CODE CITATIONS Article 210—Branch Circuits; Article 220—Branch-Circuits, Feeder, and Service Calculations; Article 225—Outside Branch Circuits and Feeders;

Outside Branch Circuits or Feeders - Is a Separate Disconnect Required?

In the 1996 National Electrical Code (NEC), Section 225-8, the requirements for installing a separate disconnecting means for a branch circuit or feeder to a separate building or structure on the same property were fairly simple.

The Assured Equipment Grounding Conductor Program

In keeping with the stated purpose of the National Electrical Code (NEC), the “practical safeguarding of persons and property…” protecting workers from electrical shock while using temporary power is of great concern for all electrical contractors.