Fundamental electrical engineering concepts and theory
Variable frequency drives are widely used to control the speed of ac motors. This note looks at the mechanisms which enable drive units to control the...
From the earliest times, humans have found ways to create light. Pre-historic peoples used natural materials (moss, grass, etc.) soaked in animal fat and...
The windings of many medium and small sized transformers are protected by restricted earth fault (REF) systems. The illustration shows the principal of...
Years ago I was told that you should always try to write the best report you can. Many years later I still think on this as one of the better pieces of...
IEC 60228 is the International Electrotechnical Commission's international standard on conductors of insulated cables. Among other things, it defines a...
Cable insulation is used to provide electrical separation between conductors of a cable. During the historical development of cables, numerous types...
The European Union is implementing a voluntary code of practice for participants with the aim of improving the overall efficiency of data centres. As part...
Most installations involve some form of lightning protection system which is connected to an earth electrode. The function of the earth electrode is to...
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Estimating maximum demand is a topic frequently discussed. Working out how much power to allow for a building can be very subjective . Allowing too much...
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