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three part question: should the chassis ground of all high voltage, high current components be connected to earth ground? 2)what about low voltege, low current devices like cd players and phono, should they have an earth ground? 3) if one component has an earth ground and another does not, with the interconnects attached, they will become grounded to each other. Should one take steps to keep them isolated from each other?
Follow Ups:
Chances are, all your components will be grounded even if some of them have 2-prong plugs - the interconnect shields function as ground leads to those components with 3-prong grounding plugs.You *can* have a ground loop, particularly with tube gear, which will give you hum - not a good thing. Putting cheater plugs on the tube amps generally solves the problem, but leaves you with a risk: if you have a high-current failure in one component, the interconnect shields may not be able to carry all that current to ground, so there is a small risk of electrocuting yourself.
This article from the Elliott Sound Products site is quite good - click on the link and go to "articles" and open the "earthing" piece. I haven't found the ground loop breaker circuit on their site yet, but when I do, I may try it so I can get rid of the cheater plugs on my amps.
WW
you've opened up a subject that whole books are written about. in most low power equipment, chassis ground is capacitively coupled to earth ground through the power supply. this applies to any device with a 2-wire plug. it's not always a good ground connection, but it's ok for most consumer equipment. sometimes you have situations where you need a better ground, either for safety reasons or for signal quality reasons.
for high voltage, high current equipment, it's usually for safety reasons, and you have a 3 prong power cord with a ground pin for earth ground through the house wiring.
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