[Eeyore]

Serge Auckland wrote:

"Eeyore" wrote
Serge Auckland wrote:

To paraphrase I think, John Linsley Hood, you can always cut down on
safety margins if you have complete control over circumstances.

There is NOTHING unsafe about Class II equipment. In fact it has to be
intrinsicly SAFER than earthed kit.


In your case, anyone making an equipment change at some stage in the
future could set up a hum-loop.

COULD ? Why WOULD they.

You're inventing fictional problems again.


Not so much a case of inventing fictitional problems, just good engineering
practice. Whenever I implement any solution to a problem, I try and think of
what could possibly go wrong in the future and try to plan for it.

All very well but if you introduce a hum loop you can add transformers THEN !
They're simply not NEEDED here !


If you're sure there won't be any future changes, and you're only trying to
avoid hum
loops, then your solution is probably fine.

It will be.


That, by the way, is what I
meant in paraphrasing J L-H. I wasn't suggesting your solution is unsafe,
just that if you solve a problem in the minimum way possible, you sacrifice
the flexibility of a better solution.

Interesting that your AV equipment is all ungrounded. Mine isn't. Some items
are ungrounded - DTTV box, DVD player, DVD recorder, but the main TV is
grounded, my CD player, pre-amp, and active 'speakers are all grounded.
Turntables are all grounded. It's a mixture, so your solution isn't
generally applicable.

A turntable does not need to be physically GROUNDED. Just connect its chassis to
the chassis of the amplifier with the cartridge preamp.

I haven't seen a TV with a ground conductor since just about forever btw.

Graham