What wire to use instead of Romex

@roccity said:

Next week I’m going to stop by a local electrical supply house that I’ve been to before and buy the cable myself.

You might want to check with the HOA first. Exposed MC cable will not be as pleasing to the eye as EMT conduit. MC exposed kind of looks like installing Romex exposed on a wall. You can support the heck out of it and it still doesn’t look pretty...

Questions:

How much of the the exposed MC cable will be seen in the garage before it enters the wall of dwelling unit?

What is the garage wall finish of the wall it will be installed on? Example, wood studs covered by drywall? Cement block? Other?

Horizontal elevation off the floor of the MC cable? Distance down from the ceiling?

Is the electrical panel surfaced mounted to the wall? 

Vertical length of the MC cable above the electrical panel  before it is installed horizontally?

Can you post a picture of the electrical panel and the area the MC cable will be installed?

.

I’m 10’ from a dedicated panel wires in wall ending at two hospital grade outlets. With connecting tabs broken I used 4 x 12 gauge Romex starting with 4 x 20 amp breakers. Clean, Independent, bendable, code, happy. 
Cheers 
 

I’m 10’ from a dedicated panel wires in wall ending at two hospital grade outlets.

What you have is basically 10ft extensions of equipment power cords. 10ft of branch circuit wiring does little, if anything, to decouple the power supplies of digital equipment from analog equipment. 

With connecting tabs broken I used 4 x 12 gauge Romex starting with 4 x 20 amp breakers.

I assume you hired an electrician for the electrical wiring installation. Per NEC code when the two receptacles of the duplex receptacle are split and are fed from separate circuit breakers, both outlets shall be de-energized by a single handle action for electrical safety. Single action, use of a 2 pole circuit breaker or two single pole breakers using an approved, Listed, breaker tie.

Problem? Just a guess the sub panel is wired as a 120/240V electrical panel. Not a 120V only sub panel.

Best practices accepted by many audiophiles, is all 120V audio equipment that will be connected together by wire interconnects,  should be fed by circuit breakers that are connected to the same bus, Leg, Line, in the 120/240V electrical panel. All to Line 1 or all to Line 2. Not from both L1 & L2 though.

Another problem I see is the close proximity of different dedicated circuits to one another. Therein induced voltage, noise, from the Hot and neutral current carrying conductor of one circuit to the other. Again it defeats the purpose of more than one dedicated circuit to feed audio equipment.

I posted this above in this thread, not sure it you read them.

Some reading material for you:

An Overview of Audio System Grounding & Interfacing

 Read page 16, and pages 31 thru 36.

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Integrating Electronic Equipment and Power

Read pages 11, 12, &13. 

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@jea48 

Questions:

How much of the the exposed MC cable will be seen in the garage before it enters the wall of dwelling unit?

The living room wall where the outlet will be is directly above the garage door. The cable will run from the ceiling of the garage down a foot or so, then to the left over the pedestrian door, along the wall with the panels, and down to the lower of my two panels (wired together to function as a single panel rather than a main and a sub). Or, it could run across the ceiling, then down to my panel. That'd be a shorter run.

What is the garage wall finish of the wall it will be installed on? Example, wood studs covered by drywall? Cement block? Other?

Wood studs with sheetrock/drywall, with plywood over it where the panels are.

Horizontal elevation off the floor of the MC cable? Distance down from the ceiling?

Is the electrical panel surfaced mounted to the wall? 

Vertical length of the MC cable above the electrical panel  before it is installed horizontally?

I haven't taken measurements, but you can probably ballpark them from the photos. And yes, surface mounted panel(s).

@roccity 

That angled flexible metal conduit feeding the small load centers is butt ugly... 

The HOA shouldn’t question your use of MC cable. Good thing about 10-2 solid copper wire MC cable, the solid #10awg copper wire stiffens the metal armor so it can look more presentable to the eye.