Discuss Ring mains? Is this true? in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

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There was I thinking that Computers, monitors, printers and most types of electronic equipment are the cause of the problem.

As this equipment utilize switched mode power supplies (SMPS) which operate by rectifying the mains supply directly and then using a high speed switching converters to step down the voltage to the accommodate the dc supplies required.

The switch spikes have to be filtered out so that they do not get into the installation and cause interference to other users, so a small filter is fitted at the mains input to each item of equipment.

A typical filter either contains contains two capacitors from Line and Neutral to the circuit protective conductor (CPC), or in many cases in modern equipment small PCB so a small continuous current flows to earth, giving us this protective conductor current
 

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