Woody wrote:

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In fact you will find that most amplifiers with a fixed cable use two
core and no earth, as do almost all other separates.


** But ONLY if they are built to Class 2 standard as indicated by the famous double square symbol on the back.

All the rest with 3 core cable and standard 3 pin IEC inlets require a safety ground.


In practice if there is to be an earth within a hi-fi system there
should only ever be one and very often that used to be on the
turntable.


** Never the TT, that is plain insane.

A power amp or integrated amp is the wise choice and the TT ground lead connected to the pre-amp or integrated amps chassis.

An all class 2 system that includes a TT invariably hums - till you add a safety earth somewhere.


..... Phil