For the past few years I have reading eBooks on my HTC touch phone. On and off I have debated buying an eReader and recently purchased a Sony PRS-300 ...
Problems on achieving maximum voltage drop within an installation come up often. Depending where you live, local regulations will have different limits...
When thinking about watts (W) or kilowatt (kW = 1000 W) it can be useful too keep in mind the fundamental ideas behind the unit. Watt is not a pure electrical...
In a previous article I looked at the dc resistance of conductors and in this article we turn our attention to ac resistance. If you have not read the...
Modelica is an open source (free) software language for modelling complex systems. Having never used it before, I thought I would download a development...
Most installations involve some form of lightning protection system which is connected to an earth electrode. The function of the earth electrode is to...
These lifts were first built in 1884 by J. E. Hall and called a paternoster ("Our Father", the first two words of the Lord's Prayer in Latin) due to its...
Earthing of electrical systems is essential for the correct functioning and the protecting of life and equipment in the event of faults. The earth electrode...
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...
The following tables provide quick order of magnitude fault levels for a a range of typical low voltage situations.
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