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.
 Threadless couplings


Article 110 in the National Electrical Code (NEC) covers general requirements for the examination and approval, installation and use, access to and spaces about electrical conductors and equipment; enclosures intended for personnel entry; and tunnel installations (110.1).

My daughter, Trina Bogart, is an emergency department doctor. She recently emailed me a seemingly simple question. However, when I went to the 2014 National Electrical Code (NEC), I realized it was actually more complicated.

Service equipment must have an interrupting rating or short-circuit current (SCC) rating equal to or greater than the amount of available fault current supplied.

More on Codes & Standards

 
Article 370 - Boxes, Conduit Bodies, and Fittings

370-23(d)(2) Enclosures Fastened to Support Wires

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Branch Circuits, Grounding, Flexible Metal Conduit, Motors, and Transformers

CODE CITATIONS Article 210—Branch Circuits; Article 220—Branch-Circuit, Feeder, and Service Calculations; Article 250—Grounding; Article 350—Flexible Metal Conduit; Article 410—Lighting Fixtures, Lampholders, Lamps, and Receptacles; Article 430—Motors, Motor Circuits, and Controllers; and

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Installing Electrical Equipment in a Combustible Dust Location

Article 502 in the National Electrical Code (NEC) covers the installation of electrical equipment in a combustible dust location.

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Safe Working Spaces around Electrical Equipment Allow Hasty Retreat

Over the past few months, we have discussed how good electrical design practice cannot and should not ignore the safety implications associated with the electrical installation.

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Is It Worth Removing the Exceptions?

Herewith, various 1999 National Electrical Code (NEC) issues that do not warrant a whole page of discussion. This is an example of why it is wrong to follow a “remove exceptions” edict without first examining the consequences. The 1996 NEC, Section 410-12 reads as follows:

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Panelboard Mounting Heights, Fire Pump Electric Service, A/C Overcurrent Protection and More

CODE CITATIONS Article 110—Requirements for Electrical Installations; Article 230—Services; Article 240—Overcurrent Protection; Article 350—Flexible Metal Conduit; Article 410—Lighting Fixtures, Lampholders, Lamps, and Receptacles; Article 430—Motors, Motor Circuits, and Controllers;

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