Jeffrey R. Jowett is senior applications engineer with Megger in Norristown, Pennsylvania. He has written numerous trade journal articles, conducted training of distributors’ sales staffs and customers, and given seminars, training sessions and talks to various electrical societies [including InterNational Electrical Testing Association (NETA) and National Joint Apprenticeship Training Committee (NJATC)], and to those open to the general industry public. He is a member IEEE, and is on the committee for the revision of Standard 81, Recommended Guide for Measuring Ground Resistance and Potential Gradients in the Earth. He has been employed for more than thirty years in electrical test and measurement instrumentation; first with Biddle, then AVO International and now Megger.
There are a variety of technologies and methods used to test the insulation of wire and cable, including high-potting, very low frequency (VLF), power factor, partial discharge, time-domain reflectometry (TDR), and “thumping.” Like a visit to the doctor’s office, each test examines the test item in a different way and looks for a different response [...]
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