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. 

Before we proceed, in part 3 of this series, the change in Section 230.70(A)(4) dealing with service disconnects on one- and two-family dwellings was reversed during the late stages of the development process and never made it into the 2017 National Electrical Code (NEC).

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 2017 NEC.
 White conductors 
in cable assemblies


For many years, the mystery of area classification has resided with a select group of experts within the electrical, petrochemical and industrial sectors. Many electricians, electrical engineers, fire inspectors and electrical inspectors have remained outside of this group.

In the 2017 National Electrical code (NEC), there are a few changes in 110.26. The first change is in subsection (A), which is part of a global change for the upper voltage threshold.

More on Codes & Standards

 
Now Hear This

Within the past few years, many of us have installed surround sound systems in homes and business. What seems to be lacking is an understanding of the new requirements that have been incorporated into the totally revised Article 640 in the National Electrical Code (NEC).


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Generator Connection, Air Conditioning Protection and More

Q: Should 250.34 or Article 702 apply to a portable generator that is connected to a domestic refrigerator, freezer, television set, and floor and table lamps in a one-family residence? A: The answer depends on the method used to connect the generator to the appliances.


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Pull- and Junction-Box Calculations, Part VI

314.28 Pull and Junction Boxes Article 314 of the National Electrical Code covers the installation and function of all boxes and conduit bodies used as outlet, device, junction or pull boxes, depending on their use.


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'I Just Want to Meet Code!'

Many professional contractors called to provide a fire alarm system in either a new or existing building have heard the owner exclaim, “I just want to meet code!” Most building owners (especially those not knowledgeable in the code process) have made the assumption that if they instruct you to “jus


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Derating Type NM Cable, Fire Pump Power and More

Article 210 Branch Circuits Article 250 Grounding and Bonding Article 310 Conductors for General Wiring Article 334 Nonmetallic-Sheathed Cable: Types NM, NMC and NMS Article 410 Luminaires (Lighting Fixtures), Lampholders and Lamps Article 695 Fire Pumps Parts of the NFPA 20-2003-Standard for the In


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Pull- and Junction-Box Calculations, Part V

Provisions pertaining to the installation and use of all boxes and conduit bodies used as outlet, device, pull and junction boxes are in Article 314 of the National Electrical Code. Section 314.16 covers provisions for sizing boxes and conduit bodies containing conductors 18 AWG through 6 AWG.


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In the Interim

The May 2005 Code Applications column contained information on a major change in Article 680 for the 2005 National Electrical Code (NEC) concerning the construction requirements of fiberglass pools, vinyl-lined pools and concrete pools containing epoxy-coated rebar.


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