Floating ground.

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Moderator Post (s) for this thread: > Multiwire ciruit by Billhart on 10/29/2007 > Grounding and bonding by Billhart on 10/29/2007 > Grounding and bonding by Billhart on 10/31/2007

First of all the this is probably not causing the noise in the amp. It is the light dimmer. Some brands are worse than others. But all do it to some extent, specially when they are on the same circuit.

" Neutral and grounds are connected to same bus bar in breaker box, I plan on changed to seperate bars. "

If the panel is the main disconnect (no breaker or fuse or switch between the panel and the meter) the bus bars are all bonded together so the ground bus is the neutral bus is the ground bus.

" Of course the outlet wasn't a 3 prong grounded, "

If this is a NEW new house get the build back in immediately. There so not be any ungrounded receptacle. And all grounds should be connected.

Now the voltage that you are measuring is common. With a high impendence voltmeter is will read a capacitivtly couple voltage on unconnected wires.

Since this had an ungrounded receptacle either this was old wiring without a ground that some one later extended with wiring with a ground or it was grounded wiring with either a break in the ground wire or who ever worked on it did not know what they where doing.


In either cases you need to back through it box by box and check it all out.