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.
 Older Type BX cable and EGCs


Article 90 is the introduction to the National Electrical Code (NEC) book, and it includes specifications that are essential to understanding the chapters and informative annexes that follow. For example, Article 90 explains how to recognize mandatory rules versus permissive rules.

During the recent 2017 National Electrical Code (NEC) first revision meetings in Hilton Head, S.C., a number of public inputs were submitted to introduce a new cabling system into Article 725 and Article 760.

The development process of the 2017 National Electrical Code (NEC) has begun. In January, 19 Code-making panels (CMPs) held their “first draft” meetings to address roughly 4,000 public inputs (PIs). The NEC is primarily a reactive code that evolves through demonstrated need.

More on Codes & Standards

 
GFCI protection at in-ground swimming pool

The Best Of Code Question Of The Day, Part II

Charlie Trout, author of Code FAQs and Code Question of the Day, has retired. 
For the rest of 2013, enjoy these snippets from his daily responses.
 Calculating conductors and breakers


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Sizing Conductors, Part XXX

transformer secondary conductor rules are similar to tap conductor rules. Article 240.21 of the National Electrical Code (NEC) covers the location and sizing requirements of overcurrent protection for tap conductors and transformer secondary conductors.

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Directly To The Point

The 2014 National Electrical Code (NEC) process received more proposals—including a total of 45 generated by the NEC Correlating Committee Task Group on direct current (DC)—and comments to insert DC into the Code than any other NEC cycle in history.

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Editors' Pick
2014 NEC Outlook, Part III

This article is a continuation of a concise and complete review of some of the more significant changes that have been incorporated into the 2014 edition of the National Electrical Code (NEC). This segment takes a look at some significant revisions in chapters 4 through 6.

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Power Down To Earth

Many buildings and structures are supplied by power from a source other than a utility service. If the supply—such as a transformer or generator—is customer-owned, it is not a service and, therefore, is either a feeder or branch circuit.

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Clarification Required?

A friend of mine recently called with a question about the cover depth requirement for an underground 120-volt (V) lighting circuit installation in rigid polyvinyl chloride (PVC) conduit supplying a wet-niche luminaire in a swimming pool.

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Down to Earth About Grounding

Ben Franklin already knew enough about grounding to keep the portion of the kite string he was holding dry. Otherwise when the lightning streaked down the wet part of the line and hit the key, he might have received more than a mild shcok when he moved his hand near the key.

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