Good outlet for amplifiers

I have a circuit in my listening room for my amplifiers and it uses a dedicated ground.

Dedicated ground ??? Are your present outlets IG, (Isolated Ground) duplex outlets?

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@peter_s said:

@jea48 That’s the word I was looking for. "Isolated Ground". Thank you! Can any/all of the recommendations above be wired as isolated ground? I think this is the case if one uses a plastic box for the outlets, or uses plastic washers and screws to attach to a metal box. Agreed???

Isolated ground? Therein an insulated green wire, Equipment Grounding Conductor, EGC, that is used for the safety equipment ground contact on an IG, (Isolated Ground) type receptacle. The green insulated, isolated, EGC is ran in the same raceway or cable as the branch circuit wiring current carrying conductors to the electrical panel the branch circuit is fed from? Is that what you mean?

Not an outdoors dedicated driven ground rod?

Here is an example of a Hubbell IG Hospital Grade duplex receptacle.

Note the IG EGC  green color ground screw and contacts are insulated, isolated, from the supporting back strap and the center 6/32 threaded hub on the front of the outlet that holds on the wall cover plate.

What is the branch circuit wiring ran in? Conduit? Or a Cable like Romex?

Yes, as you described, there is a green insulated wire included in the run.  I will need to open things up to see if there is also a bare copper wire for grounding the box and to confirm that the box is metal... but I know we used an armored cable running on the outside of the wall to get this additional dedicated circuit to my amps, and so the armor on the cable acts as further shielding/ground, but is not the same as the green wire (isolated) ground. 

ya, that would be a good idea. Saves a lot of guess work what the electrician used.

Don't forget to turn off the breaker. Verify the circuit is dead.

While looking inside the outlet box look for two green insulated ground wires.

Write down the number of, and colors of, all the wires in the armor cable.

Are you sure the duplex outlet(s) are IG grounding type? They are orange in color or have an orange triangle on the face plate? Like this one for example.

Here is an example of a Hubbell IG Hospital Grade duplex receptacle.

I assume your house is wood framing. Why did you go with IG outlets and IG ground. What did the electrician say about it? Or was it his suggestion?

I'm glad you didn't say the IG ground wire connects to a dedicated ground rod. That's usually the cause.

FWIW not that many IG outlets are installed these days. They really are only used in commercial and industrial facilities. They where big in the 1970s, 1980s, and into the 1990s but really dropped off in the 2000s. 

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I think this is the armored cable used.

I hope not... That’s AC armored cable. Commonly called BX cable.

Hopefully yours in MC, (Metal Clad) Cable

https://www.southwire.com/wire-cable/metal-clad-cable/armorlite-type-mc-isolated-ground/p/MC40

https://www.southwire.com/wire-cable/metal-clad-cable/armorlite-type-mc-isolated-ground/p/69599901

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Edit:

This armored cable is apparently MC cable. Manufacture calls it Metal Clad. Must be new. I have never seen MC cable with a bare aluminum ground wire. Junk for feeding audio equipment, imo.

I doubt very much that’s what you have. No way that could be considered as an IG conductor.

This is AC armored cable. A different animal than MC cable.

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