Charles R. Miller

Code Contributor

Charles R. Miller, owner of Lighthouse Educational Services, teaches classes and seminars on the electrical industry. He is the author of “Illustrated Guide to the National Electrical Code” and NFPA’s “Electrical Reference.” He can be reached at 615.333.3336, charles@charlesRmiller.com or www.charlsRmiller.com

Articles by Charles R. Miller

October 2017
Thousands of public inputs (formerly proposals) are usually submitted for revising the next edition of the National Electrical Code (NEC). With some editions, there are global, Code-wide changes. One of the Code-wide changes in the 2014 edition was raising the voltage threshold from 600 to 1,000 volts (V) in a number of locations.
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September 2017
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. It contains five parts.
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August 2017
National Electrical Code (NEC) Article 110 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. READ MORE
July 2017
The last section in Part II of Article 110 in the National Electrical Code (NEC) covers enclosure types. The section for enclosure types has not always been 110.28. Enclosure types has only been 110.28 since the 2011 edition of the NEC. For the 2008 edition, the section for enclosure types was 110.20.
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June 2017
The National Electrical Code (NEC) is full of rules and regulations that are intended to make electricity use safe. Consider the rules for sizing conductors and overcurrent protection. Without very specific rules for determining the right size conductor and the correct size overcurrent protective device, a conductor could overheat and start a fire, which could harm people and damage property. 
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May 2017
Having adequate working space around electrical equipment is essential. Article 110 in the National Electrical Code (NEC) contains requirements for this access. Part II in Article 110 pertains to systems rated 1,000 volts (V), nominal, or less. Section 110.26 contains almost two pages of provisions covering spaces about electrical equipment. READ MORE
April 2017
As stated in 90.1(A) of the National Electrical Code (NEC), the purpose of the Code is the practical safeguarding of people and property from hazards arising from the use of electricity. However, complying with NEC rules and regulations will not necessarily provide an installation that is efficient, convenient or adequate for good service or future expansion of electrical use.
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March 2017
Article 110 in the National Electrical Code (NEC) contains general requirements for electrical installations. Topics include examination and approval, installation and use, and access to and spaces about electrical conductors and equipment. This article is divided into five parts.
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February 2017
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. When the 2011 edition of the Code was revised for 2014, the voltage threshold was changed from 600 volts (V) to 1,000V in many locations throughout the Code. READ MORE

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