Isolation Transformer and Subpanel recommendations

Noise is unpredictable for either type, aggrevated by external conditions. Potential advantage of tighter windings of toroidal is offset by greater sensitivity to same conditions. Some people mount the transformer near the electrical panel (basement?), away from the living space.

Dryers and ovens are usually 240V.

Jea48: the wiring in our houses here is 120V and 240 comes into the house and is split out normally. I did have an error in my response in that we are not obligated to only have 120V here. I currently have a 240V line to the kitchen where an old electric stove used to be, another for a heat pump, and a 3rd for the dryer to the laundry room. I could choose to run a 240V line to the attic for an isolation transformer if I had to. For that matter, I could also choose to drop an entire 2nd house circuit immediately after the meter and skip the main breaker panel altogether; my response was more thinking of limiting the invasive electric/structure work that would be required here. My apologies for the confusion my original response probably caused...

Zephyr24069,

I would feed the 5 Kva xfmr with 240V balance power.

If your plan was to install the xfrm by your audio equipment so you could use the existing dedicated circuit you now have, you can still use a 240V fed xfmr.

The existing dedicated branch can easily be converted to 240V. The #10 wire is rated for 600V.

Jea48: Thank for the help and advice; my plan is to install the transformer in an adjoining attic over a garage where any humming from the transformer will not be hear and any heat will dissipate. The attic does get hotter in the summers (have thermostat-controlled fans on either side of attic) but overall I think is the best option as I can also have a platform built to bolt the transformer to in the attic as well as investigating any vibration damping solution I might need to ensure the results are optimal.

my plan is to install the transformer in an adjoining attic over a garage where any humming from the transformer will not be hear and any heat will dissipate.

Not a good idea..... I doubt you will find a licensed electrician that will do it.

Why not mount the xfmr on a wall in the garage. It can be mounted up high near the ceiling. (At least 12" down from the ceiling for heat dissipation)

Is the main electrical panel for the house in the garage?

Where are you planing on mounting the new electrical panel that will be fed from the xfmr?