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. 

What is a knife switch?


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.
 What is a knife switch?


The National Electrical Code (NEC) has contained multiwire branch-­circuit color coding since the early 1950s. However, it wasn’t until the 2005 NEC that it required the voltage system to identify ungrounded conductors where a building had more than one voltage system.

The stated purpose of the National Electrical Code (NEC) is the practical safeguarding of people and property from hazards arising from electricity use. One way to help do this is to ensure there is enough room around electrical equipment.


This article reviews changes in Chapter 3, Wiring and Methods and Materials, and Chapter 4, Equipment for General Use, in the 2017 edition of the National Electrical Code (NEC).
 336.10 Uses Permitted


More on Codes & Standards

 
Grounding Connections

The basis of grounding and bonding starts at the connection of a bonding jumper or an equipment-grounding conductor to a box, an enclosure or other electrical equipment and ends at the point of connection to the service-grounded conductor in a grounded system or at the service-equipment enclosure fo


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Box Fill Calculations, Part III

Article 314: Boxes, Conduit Bodies, Fittings and Manholes 314.16(A) Box Volume Calculations Article 314 of the National Electrical Code 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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Box Fill Calculations, Part II

Article 314: Boxes, Conduit Bodies, Fittings and Manholes


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Box Fill Calculations: Article 314: Boxes; Conduit Bodies; Fittings and Manholes

Article 314 of the National Electrical Code 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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Identification of Disconnecting Means

One of the most important NEC requirements (and yet one most often ignored) is 110.22: Identification of Disconnecting Means. It reads: “Each disconnecting means shall be legibly marked to indicate its purpose unless located and arranged so the purpose is evident.


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Certification as Separation

Photovoltaic (PV) modules convert sunlight into electrical energy that can be used to provide power for specific loads within a building in a standalone system or as a supplement to the building’s utility power supply in an integrated system.


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The Ins and Outs of AFCI Protection

The arc-fault circuit-interrupter (AFCI) has been around for three National Electrical Code (NEC) cycles and, with the advent of the new 2005 NEC, will have been present in three editions, although with various changes within each edition.


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