Electrical Contractor Magazine

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 codefaqs@gmail.com. Answers are based on the 2014 NEC.
 Type SE cable support

Article 240, in the National Electrical Code (NEC), provides general requirements for overcurrent protection and overcurrent protective devices.

For many years, Article 250, which covers grounding and bonding in the National Electrical Code (NEC), only contained two tables. Table 250.122 was used for sizing the equipment grounding conductors, based on the size of the overcurrent protective device in the circuit.

Energy management is becoming commonplace in today’s electrical infrastructures through the control of utilization equipment, energy storage and power production. Yet, limited consideration is found in electrical installation standards to actively manage these systems.

Electrical Contractor Magazine

More on Codes & Standards

Sizing Conductors, Part XIII

When sizing conductors, more is involved than just looking at Table 310.15(B)(16) in the National Electrical Code (NEC) and selecting a copper or aluminum conductor with the right ampacity. Of all the tables in Article 310, Table 310.15(B)(16) is referenced the most.

Planning for PV Output

I started this series of articles after a friend asked some questions about overcurrent protection for the direct current (DC) output of photovoltaic (PV) modules, the DC output of combiner boxes, the location of disconnects for both the DC side and the alternating current (AC) side of the inverter,

Boxes and Raceways, Dead-Front Panels and More

If you have a problem related to the National Electrical Code (NEC), are experiencing difficulty in understanding a Code requirement, or are wondering why or if such a requirement exists, ask Charlie, and he will let the Code decide. Questions can be sent to codefaqs@earthlink.net.

Using What's There

In many workshops that I have instructed recently, installers have asked if the National Electrical Code (NEC) permits an appliance to be added to an existing 20-ampere (A) branch circuit without having to route an individual branch circuit.

Sizing Conductors, Part XII

As stated in 90.1(A) of the National Electrical Code (NEC), the purpose of the Code is the practical safeguarding of people and property from hazards arising from the use of electricity.

Fire Alarm System Submission

Recently, while attending a lunch-and-learn presentation from one of the better local distributors of fire alarm systems, we wound up discussing the quality of fire alarm system submissions from contractors.

Carbon Monoxide Detection

Carbon monoxide (CO) is a colorless, odorless and tasteless gas that in sufficient concentrations, can threaten life.