Excellent ideas, all of the above.
One addition is to ensure your circuits which feed any computer equipment are also served by armored cable (BX). The noise emitted by NM (Romex) with computers attached is terrible.
The idea of using #10 BX is a good one, but limit the circuit breaker to the rating of the receptacle (20A).
Isolation transformers serve best when connected phase-to-phase on the primary side (240V) avoiding the polluted neutral connection filled with harmonics. The secondary should be center tapped, for your equipment.
This creates a separately derived system; one which must be grounded as well. However, this ground, while connected to all available grounding electrodes (typically cold water on the street side of the main water shutoff, within two feet of the entry of the water pipe to the house) and a supplemental grounding electrode (ground rod), will be an independent connection for the derived neutral on the isolated system. This method means least electrical noise intrusion into the isolated system. BUT, it also means providing a distribution system with overcurrent protection for the derived circuits. In other words, use the transformers to feed a circuit breaker subpanel.
If your electrician doesn't immediately understand exactly what I've written above, run away fast and find a new one.
Best of luck,
Stuart Polansky
Maryland State ME #7461
One addition is to ensure your circuits which feed any computer equipment are also served by armored cable (BX). The noise emitted by NM (Romex) with computers attached is terrible.
The idea of using #10 BX is a good one, but limit the circuit breaker to the rating of the receptacle (20A).
Isolation transformers serve best when connected phase-to-phase on the primary side (240V) avoiding the polluted neutral connection filled with harmonics. The secondary should be center tapped, for your equipment.
This creates a separately derived system; one which must be grounded as well. However, this ground, while connected to all available grounding electrodes (typically cold water on the street side of the main water shutoff, within two feet of the entry of the water pipe to the house) and a supplemental grounding electrode (ground rod), will be an independent connection for the derived neutral on the isolated system. This method means least electrical noise intrusion into the isolated system. BUT, it also means providing a distribution system with overcurrent protection for the derived circuits. In other words, use the transformers to feed a circuit breaker subpanel.
If your electrician doesn't immediately understand exactly what I've written above, run away fast and find a new one.
Best of luck,
Stuart Polansky
Maryland State ME #7461