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 III

Whether conductors are supplying power to branch circuits, feeders or services, the ampacity must not be less than the load. The load can be an actual load, or it can be calculated in accordance with the requirements in Article 220 of the National Electrical Code (NEC).

READ MORE
 
Sizing Conductors, Part II

Many factors are involved when sizing conductors. Specifications for sizing conductors are not just in one section or even one article of the National Electrical Code (NEC).

READ MORE
 
Mount Up

This article continues outlining the procedures for means of providing safe access, pathways and areas considered appropriate for egress to and from photovoltaic (PV) systems. The cell, module, panel and array generally make up a PV system.

READ MORE
 
Disconnecting Four-Gang Boxes, Sizing Grounding-Electrode Conductors 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.

READ MORE
 
Hanging by a Thread

There is a new technology using low-voltage lighting power distribution at 30 volts (V) or less where the suspended ceiling grid is a lighting power distribution system.

READ MORE
 
Panelboard Overcurrent Devices, Garage Receptacles 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.

READ MORE
 
Sizing Conductors

Selecting the correct size conductor involves referencing more than one section and more than one chapter in the National Electrical Code (NEC). The following questions must be answered before selecting conductors.

READ MORE

Pages