Ring mains? Is this true?

[jave]

i think ring main system are more efficient in hv distribution system

 

[hermetic]

I've always thought it was the mains filters on the system units.

Think you will find that it is mainly to due with the degaussing set up on the CRT that discharges any static build and capacitance build up to earth or chassis as you turn the monitor on. That is the crackle you hear at switch on.

 

[malcolmsanford]

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