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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 11:26:08:
For the DU-3 I would put a 10-15 amp fast-blo fuse in the PRIMARY of the transformer.

Used as a balance power system.

The 3000Va transformer is derated by 1/2.
1500Va divided by 120V = 12.5 amps.
12.5 X 125% = 15.62 amps. Minimum fuse size 15 amp if the full potential of the xfrm is to be utilized.

The drawing you supplied does not show GFCI protection , (Ground Fault Circuit Interrupter), on the secondary output which is required for electrical safety.