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.
 Stranded conductor terminations 


Selecting the correct size conductor is not difficult, but it involves more than selecting a conductor based solely on the ampacity shown in Table 310.15(B)(16) in the National Electrical Code (NEC).

The concept of modular data centers (MDCs) originated about six or seven years ago as a portable method of delivering information technology data center capacity without the high cost and long construction time.

Grounding electrode conductor connections are an important part of any electrical safety system. These connections ensure the path to ground through any of the grounding electrodes identified in Section 250.52(A).

More on Codes & Standards

 
Only Temporary

Recent discussions on ground-fault circuit interrupter (GFCI) protection for personnel on construction sites have indicated that there seems to be a misunderstanding of whether generator power is excluded from the GFCI requirement.

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Transformer Sizes, Metal Clad Cables and More

Outside feeder grounding and bonding Q: What grounding and bonding requirements apply to an outside feeder that supplies a woodworking hobby shop that is located in a detached building and is about 60 feet from, and supplied from, a single-family residence?

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Pull- and Junction-Box Calculations, Part VII

314.28 Pull and Junction Boxes Chapter 3 of the National Electrical Code (NEC) covers wiring methods and materials. Article 314 covers the installation and use of all boxes and conduit bodies used as outlet, device, junction or pull boxes, depending on their use.

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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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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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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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