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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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RE: for those who built Signal DU/SU-based conditioners

Posted by jea48 on July 9, 2012 at 08:02:40:
I built mine with a DU-5 to Batman's schematic and use a 15amp thermal breaker (instead of fuse) which is fed from a dedicated 20amp line.
Used as balanced power system.
5000Va derated by 1/2.
2500Va divided by 120V = 20.8 amps.
20.8 X 125% = 26 amps. Minimum wire size #10 awg. (Minimum if full power potential of xfmr is desired.)
Breaker size 30 amp.
Depending on the total length of the #12 branch circuit wire, times 2, the transformer could be starved for dynamic head room power and thus not be able to supply the full power needed by a power amplifier connected to the balanced power xfmr.
(Also keep in mind the power efficiency of the xfmr is some what reduced because you are feeding the the primary winding with half the voltage the xfmr was designed to be fed by.)