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

November 2010
Last month’s Code in Focus covered multifamily-dwelling house loads as calculated in accordance with the optional method. This month, the discussion continues with the connected loads for multifamily dwellings as specified in 220.84(C)(4) of the National Electrical Code (NEC). READ MORE
October 2010
Article 220 of the National Electrical Code (NEC) contains requirements for calculating branch-circuit, feeder and service loads. While understanding load calculation requirements is essential to the professional electrician, knowing what to do with the results from the load calculations is just as important. READ MORE
August 2010
A large number of calculation provisions are in the National -Electrical Code (NEC). Knowing where to find those calculation provisions and how to perform them is essential to electricians, engineers, inspectors and others involved in the electrical industry. READ MORE
July 2010
Load calculation requirements are in Article 220 of the National Electrical Code (NEC). This article contains provisions for calculating branch-circuit, feeder and service loads. Article 220 does not contain all the provisions that must be considered when calculating branch-circuits, feeders and services. Other references found elsewhere in the Code must be considered. READ MORE
June 2010
Last month’s Code in Focus concluded by covering optional feeder and service load calculation requirements for one-family dwellings in 220.82. This month, the discussion continues with optional feeder or service load calculations for existing dwelling units as specified in 220.83. Section 220.83 pertains to an existing dwelling that will be getting some type of additional electrical load. READ MORE
May 2010
Article 220 of the National Electrical Code (NEC) provides requirements for calculating branch-circuit, feeder and service loads. Article 220 is divided into five parts. Part I contains general requirements for calculation methods. Part II provides calculation methods for branch-circuit loads. READ MORE
March 2010
The first edition of the National Electrical Code (NEC) was developed in 1897. Including the 2008 edition, there are 51 editions. A lot has changed, both in the electrical industry and in the Code book, since the first edition. However, the Code’s purpose has always been protecting people and property from dangers that can come from the use of electricity. READ MORE
February 2010
Load calculation requirements are in Article 220 of the National Electrical Code (NEC). This article provides requirements for calculating branch-circuit, service and feeder loads. READ MORE
January 2010
Article 220 of the National Electrical Code (NEC) provides requirements for calculating branch-circuit, service and feeder loads. Definitions for the three types of loads that Article 220 covers are in Article 100. A branch circuit is the circuit conductor between the final overcurrent device protecting the circuit and the outlet(s). READ MORE

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