Welcome to CharlesRMiller.com!Charles R. Miller owned and operated a successful commercial electrical contracting company (Lighthouse Electric Company Inc) in Nashville, Tennessee. Throughout those years, he prided himself on solving problems abandoned by less skilled, or less dedicated, technicians...
Recent Article published in the Electrical Contracting Magazine
Article 220 – Load CalculationsArticle 220 – Load Calculations 220.55
The National Electrical Code (NEC) contains a large number of calculations. Understanding how to perform NEC calculations is essential to electricians, engineers, inspectors and others involved in the electrical industry. Knowing how to perform calculations could even be the difference between pass and fail on a journeyman or master electrician’s exam.
Article 220 contains a number of calculations. Requirements for calculating branch-circuit, feeder and service loads are in Article 220. It may be necessary to calculate the loads by using the provisions in Article 220 before selecting conductors and overcurrent de-vices. For example, results from calculations in Article 220 are used with provisions in 210.19(A) to find the minimum branch-circuit conductor size.
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