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IAEI Magazine | Author: Thomas L. Harman
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Thomas L. Harman

Thomas L. Harman is an electrical engineer with a Ph.D. in electrical engineering from Rice University. He has held master electrician's licenses in many cities and states around the U.S. and has been a master electrician since 1973 in Houston, Texas. He has also had considerable practical experience in industrial, commercial and residential electrical design and installation. Dr. Harman has been called as an expert witness in numerous cases involving electrical accidents and faulty electrical designs. Presently he is the chair of the Computer Engineering department at the University of Houston Clear Lake near NASA Johnson Space Center in Houston, TX. He is a member of the National Electrical Code Code-making Panel No. 2 that deals primarily with branch-circuit, feeder and service calculations. As a result of his experience, he has written the popular textbook Guide to the National Electrical Code, published by Prentice Hall, Inc., Upper Saddle River, NJ. This book is now in its ninth edition. In private classes, Dr. Harman has used this textbook to train many electricians to prepare for their master's examination.


Go Tankless…and Stay in Hot Water

A recent study by the National Association of Home Builders (NAHB) Research Center concluded that the national average for hot water usage in homes is approximately 62 gallons per day or 22,630 gallons per year.1 To heat all of this water, there are many choices in water-heating systems. All such systems serve to raise the temperature of the incoming water to about 120°F (49°C) at the hot water outlets. The heart of the system is the water-heating unit that may be gas fired, electric, solar, or energized by other means.

A Personal View of NEC Code Making Panel 2

It has been my pleasure and responsibility to be a member of National Electrical Code (NEC) code-making panel 2 (CMP-2) for nine NEC code cycles. Over this time, the code-making panels have produced the codes for 1981, 1984, 1987, 1990, 1993, 1996, 1999, 2002 and they are now working on the 2005 edition of the NEC. In this article, I will describe some of my experiences on this panel as well as some of the important code rules that have been introduced into the NEC by CMP-2 over the years.