Dedicated Lines and Wall Boxes

Perhaps this is a dumb question, but what is the deal with using a "non-magnetic" box or a "non-magnetic" cover plate? Why is the "magnetic" nature even an issue for these components?

Dbld:
From what little I remember from physics electrical energy is firstly derived from large magnetized generator motors (powered by fossil or nuclear fuel) and that all electricity creates a magnetc field around it which is obviously very low energy. Other than that I would have to forward your question to my Eletrical engineering uncles one of whom is a professor in that field. Let me know.

So what is bad about having a steel cover plate or gang box?

Dbid,

Steel is CONDUCTIVE, plastic is not. That means installing more than one electrical outlet within the wall box (say 2, 3, 4 or 6 gang), grounds are not connected through the walls of the box. If you don't understand why that is bad, there are countless threads here at Audiogon about dedicated lines, dedicated and/or preferential ground and isolated ground.

In addition to that, steel is magnetic and can contribute to the sound. This is why some designers of high end stereo gear use non magnetic chassis parts such as aluminum, copper and carbon fiber.

Albert
Can I sidestep you for a second with a question regarding cover plates?I need a 3 gang BRASS DUPLEX cover plate to replace the existing and damaged one on my Tice Powerblock?Any ideas for a source to buy one?
Thanks
George