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.
 Phase converters and fire-pump service


Article 450 in the National Electrical Code (NEC) covers requirements for transformers. The scope of Article 450, located in 450.1, states that it covers the installation of all transformers, but there are eight exceptions.

NFPA 70, the National Electrical Code (NEC), is an installation code, while NFPA 70E is the Standard for Electrical Safety in the Workplace. There is an unofficial line of demarcation between the two documents.

An electrical contractor recently requested information about the required emergency disconnects for a motor-fuel-dispensing facility.

More on Codes & Standards

 
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.

READ MORE
 
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.

READ MORE
 
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.

READ MORE
 
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.

READ MORE
 
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.

READ MORE
 
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).

READ MORE
 
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.

READ MORE

Pages