Earthing a double insulated Amp

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I have an '89 vintage Japanese Integrated Amp with 2 core mains cable that shows on the back (of a metal case/chassis) the concentric boxes of double insulation. But inside there is an earth wire from the main PCB to the chassis, which originates just after all of the power supply bits.
My question is, I wanted, as part of the upgrade/renovation process, to include an IEC socket and to beef up the gauge of cable. Nothing fancy just DIY stuff.
Is it detrimental to include an earth as part of this, or will it lead to ground loop problems/make the whole thing "live", or much worse lead to the big bang and let all the magic smoke out?
I guess in a similar vein, is star grounding in all it's permutations, trying to fix an earthed/ground loop problem, and I'm better off to stay with the 2 core double insulation?
It may be very obvious to you technical types, but I just can't find (or should I say understand:)) the basic answers with days of searching.
 

Mooly

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2007-09-15 8:14 am
I would stay with the 2 core scheme on the (grounds :D) of not wanting to introduce a ground loop.

Safety wise there is no issue as long as any mains ground was wired correctly and safely, because the amp will get grounded anyway via many source components (tape/tuner/CD etc) via the interconnects and the ground connections of the source.
 
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