circuit protection should operate in the event of a fault to earth. The speed of operation of the protective device is of extreme importance and will depend on the impedance of the earth fault loop path. • the circuit protective conductor (CPC)• the consumer’s earthling terminal and earthing conductor• the return path, either metallic or […]
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The thin layer of material which covers our planet – rock, clay, chalk or whatever – is what we in the world of electricity refer to as earth. So, why do we need to connect anything to it? After all, it is not as if earth is a good conductor It might be wise at
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The basic analog multimeter is commonly referred to as a VOM (volt-ohmmilliammeter). The VOM shown measures ac and dc volts from 250 mV full scale to 1000 V, dc from 50 μA full scale to 10 A, ohms up to 20 M, and decibels (dB) with a total of 29 ranges. The accuracy on dc
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No-load operation The basic operation of all these generator types can be explained using two simple rules, the first for magnetic circuits and the second for the voltage induced in a conductor when subjected to a varying magnetic field.
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The most commonly used instrument in electronic and electrical engineering is the cathode ray oscilloscope or its digital counterpart, the digital storage osciuoscope. It is difficult to envisage design, development, testing or maintenance without the oscilloscope. The oscilloscope makes visible the waveforms in the circuits of interest and is therefore the means whereby the engineer