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 2017 NEC.
 Parallel equipment 
grounding conductors


The last section in Part II of Article 110 in the National Electrical Code (NEC) covers enclosure types. The section for enclosure types has not always been 110.28. Enclosure types has only been 110.28 since the 2011 edition of the NEC.

In the past two National Electrical Code (NEC) cycles, there have been substantial changes in Article 517 dealing with healthcare facilities.

An equipment grounding conductor (EGC) installed with a branch circuit or feeder circuit performs three important functions in the electrical safety system. EGCs provide a path that connects equipment to ground, thereby performing grounding functions.

More on Codes & Standards

 
Class 2 and 3 Circuits

Class 2 and 3 circuits are defined as the portion of the wiring system between the power source and the connected equipment.


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Lying Down on the Job

As my March 2007 column “At the Service Entrance” detailed, inspectors, manufacturers, contractors and electricians have long debated the installation orientation of panelboards and circuit breakers. Should a panelboard be installed in only a vertical position, or can it be installed horizontally?


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Voltage Limits, Hall Area Lighting and More

Article 210 Branch Circuits; Article 310 Conductors for General Wiring; Article 404 Switches; Article 430 Motors, Motor Circuits, and Controllers; Article 695 Fire Pumps; Article 702 Optional Standby Systems; Chapter 9 Tables; The 2006 edition of the Guide Information for Electrical Equipment publis


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Panelboard Orientation

Inspectors, manufacturers, contractors and electricians have debated the installation orientation of panelboards and circuit breakers for many years. Should a panelboard be installed only in a vertical position, or can it be installed horizontally?


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Branch-Circuit, Feeder and Service Calculations, Part XVI

Article 220—Load Calculations: 220.14 Motors


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Become a Problem Solver

Those of you tasked with selling fire detection and security systems for your company (and we are all in sales in one form or another) look for ways to set your company apart from the competition; most companies try to promote their strengths and benefits to an owner.


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