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. 

Slash-rated breakers on 480V ungrounded delta?


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.
 Slash-rated breakers on 480V ungrounded delta?


Article 110 in the National Electrical Code (NEC) contains general requirements for electrical installations. Some of the topics covered include examination and approval, installation and use, and access to and spaces about electrical conductors and equipment.


A caller recently asked if all 125-volt (V), 15- and 20-ampere (A) receptacles in a commercial kitchen were required to be ground-fault circuit interrupter (GFCI) protected, even where part of a listed assembly.

The decision to install and operate an ungrounded system is typically a combined effort that includes a design or engineering team, the owner, the operators and sometimes the authority having jurisdiction.

More on Codes & Standards

 
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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Editors' Pick
2014 NEC Outlook, Part II

Part I of this series reviewed some Code-wide revisions and some of the significant changes in Chapter 1 of the National Electrical Code (NEC). This segment takes a look at some significant revisions in chapters 2 and 3 (with the comment or proposal number cited after each listing).


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Know Your Type: Branch-circuit wiring in patient care areas


Someone recently inquired about the proper wiring methods in a patient care location of a healthcare facility. A few factors relate to this determination.


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NM Cable In A Drop Ceiling, Terminals For Multiple Conductors And More

Editor’s note: Charlie Trout is moving on to retirement. This edition of Code FAQs will be the last collection of questions and answers he will provide. For the next few months, tune in for a “best of” series of Code Questions of the Day by Charlie. A new writer will be introduced in January.


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Editors' Pick
2014 NEC Outlook

It seems like just yesterday that the NFPA Standards Council issued the 2011 National Electrical Code (NEC). However, we’ve moved on to the next one; the 2014 edition was up for approval in August.


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Sizing Conductors, Part XXVIII

There is more to sizing a conductor than just selecting a conductor from Table 310.15(B)(16) (formerly Table 310.16) in the National Electrical Code (NEC).


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