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. 

What is a knife switch?


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.
 What is a knife switch?


The National Electrical Code (NEC) has contained multiwire branch-­circuit color coding since the early 1950s. However, it wasn’t until the 2005 NEC that it required the voltage system to identify ungrounded conductors where a building had more than one voltage system.

The stated purpose of the National Electrical Code (NEC) is the practical safeguarding of people and property from hazards arising from electricity use. One way to help do this is to ensure there is enough room around electrical equipment.


This article reviews changes in Chapter 3, Wiring and Methods and Materials, and Chapter 4, Equipment for General Use, in the 2017 edition of the National Electrical Code (NEC).
 336.10 Uses Permitted


More on Codes & Standards

 
Significant Changes for the 2008 NEC -Part 2

There were 3,688 proposals for changes to the National Electrical Code (NEC) and approximately 2,500 comments processed by National Fire Protection Association staff at NFPA headquarters in Quincy, Mass. The following is part two in a series of significant changes for the 2008 NEC.


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NECA's Revised Standard for Installing and Maintaining Switchboards

The National Electrical Contractors Association (NECA) published NECA 400-2007, Standard for Installing and Maintaining Switchboards(ANSI).


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Voltage Between Adjacent Devices

Occasionally, an electrical installation practice is discovered that is dangerous to both electrical maintenance personnel and the facility where it is located.


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Protecting Transformers

Protection for transformers rated 600 volts or less is determined by selecting one of three levels of full load current (FLC) found in Table 450.3(B) of the National Electrical Code (NEC). Levels are based on either primary protection only or by providing both primary and secondary protection.


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Bonding of Pool Water

There are times when an idea seems to take on a life of its own, and bonding of swimming pool water seems to be one of those. This idea was proposed for the 2005 National Electrical Code (NEC), passed at the proposal stage and was soundly rejected at the comment stage.


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