As the title says I want to know your views on this: I have a receiver which requires 220 volts DC HT for the valve anodes and 12.6 volts DC for the heaters from a seperate PSU at the moment I have it run via a variac fed from an isolation TX the unfortunate thing is its audio output is a bit on the low side so I want to run it through an audio amplifier the thing is the amp has the mains neutral straight to chassis and one side of AF input also to the chassis so if I link the 2 beasts together my receiver RF Earth will also be taking the amps chassis to earth I could run it all from the isolation TX do you think that's the best option?
Earthing the neutral makes it a TN-C, even if your supply is TT ... if you're on a public LV supply, that would not comply with legislation (ESQCR).
It also might cause mis-operation of RCDs (including, potentially in some circumstances, an RCD not detecting a fault that is should) - RCDs are not to be used upstream of TN-C circuits in the rare circumstances they are permitted in the UK.
Neutral is a live conductor, and therefore your only choice with older equipment (or home-grown equipment) where the neutral is connected to chassis, is to use an isolating transformer
Earthing the neutral makes it a TN-C, even if your supply is TT ... if you're on a public LV supply, that would not comply with legislation (ESQCR).
It also might cause mis-operation of RCDs (including, potentially in some circumstances, an RCD not detecting a fault that is should) - RCDs are not to be used upstream of TN-C circuits in the rare circumstances they are permitted in the UK.
Neutral is a live conductor, and therefore your only choice with older equipment (or home-grown equipment) where the neutral is connected to chassis, is to use an isolating transformer
