Yes, This has been discussed many many times over.
Look up what you can on ground loops.
One such discussion is here,
http://www.diyaudio.com/forums/construction-tips/251996-ground-loops.html#post3836854
jer
Look up what you can on ground loops.
One such discussion is here,
http://www.diyaudio.com/forums/construction-tips/251996-ground-loops.html#post3836854
jer
Class11 equipment that is described as Double Insulated does not need a Mains Earth connection.
Class1 equipment must have a Mains Earth connection.
We are required to make a permanent connection directly from the Protective Earth (PE) wire to Chassis. This is (in the UK) the green/yellow third wire in the flexible cable.
All Class1 equipment must have a connection from all exposed conductive parts to Chassis. Metal screw heads, metal knobs, metal RCA sockets, metal panels that are insulated from the protected Chassis any other conductive parts that you can touch.
If you comply with these two requirements, then a Mains Power Fault that makes any of these parts LIVE will blow the correctly sized Mains Fuse and effectively make the unit safe until a repair is completed.
You have no option in any of these THREE requirements.
Just in case you don't believe me then go back to post2
Class1 equipment must have a Mains Earth connection.
We are required to make a permanent connection directly from the Protective Earth (PE) wire to Chassis. This is (in the UK) the green/yellow third wire in the flexible cable.
All Class1 equipment must have a connection from all exposed conductive parts to Chassis. Metal screw heads, metal knobs, metal RCA sockets, metal panels that are insulated from the protected Chassis any other conductive parts that you can touch.
If you comply with these two requirements, then a Mains Power Fault that makes any of these parts LIVE will blow the correctly sized Mains Fuse and effectively make the unit safe until a repair is completed.
You have no option in any of these THREE requirements.
Just in case you don't believe me then go back to post2
and do your homework.
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It depends on whether something upstream or downstream is earthed as well.
If it is then you can avoid a ground loop by not earthing zero volts.
On the other hand if nothing is earthed you can get hum from floating lines.
What I do is earth the amplifier zero volts but leave all others floating.
If it is then you can avoid a ground loop by not earthing zero volts.
On the other hand if nothing is earthed you can get hum from floating lines.
What I do is earth the amplifier zero volts but leave all others floating.
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