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. 

The National Electrical Installation Standards (NEIS) are the only American National Standards Institute-approved performance and workmanship industry standards for electrical construction.

Branch-circuit markings


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.
 Branch-circuit markings


As Section 110.2 States, The National Electrical Code (NEC) provides installation requirements for electrical conductors and equipment that are either required or permitted to be installed. However, these conductors and equipment are only acceptable if the installation is approved.

The second article in the National Electrical Code (NEC), Article 100, contains definitions that are essential to the proper Code application. Article 110 contains many requirements that are essential to understanding and applying requirements located throughout the Code.

More on Codes & Standards

 
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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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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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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Grounding Electrodes, SE Cables and More

Fire pump disconnecting means Q: Is the disconnect for an electric motor driving a fire pump required to be within sight of the motor or is it permitted to be out of sight if capable of being locked in the off position? Can the disconnect and overcurrent protection be located in a panelboard?


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