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In Reply to: Balanced Power Transformers posted by Brody on May 18, 2014 at 05:13:12:
An Overview of Audio System
Grounding and Interfacing
by
Bill Whitlock, President
Jensen Transformers, Inc.
Life Fellow, Audio Engineering Society
Life SeniorSo-Called “Balanced Power”
• Properly called SYMMETRICAL power
• Has very seductive intuitive appeal
• NOT similar to balanced audio lines in any way!
• Uses transformer having 120 V center-tapped secondary
• Both line and neutral output blades are energized at 60 V
• Although advertising often implies endorsement, NEC seriously restricts
its use – because it’s potentially dangerous!
• ONLY FOR PROFESSIONAL USE
• NOT to be used with lighting equipment, especially screw-base bulbs
• MUST have GFCI at outputs
• Only technical function is to reduce leakage currents
• Leakage currents are trivial system noise sources
• Reported noise reduction generally less than 10 dB
• Any real benefit likely due to its clustered outletsThis is an example of “marketing gone wild” if ever there was one!
From page 201, PDF Link below.
Edits: 05/18/14
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Follow Ups
- RE: Balanced Power Transformers - jea48 10:24:50 05/18/14 (2)
- Oh my, way too much info but - mcondo 05:25:06 05/19/14 (0)
- RE: Balanced Power Transformers - Brody 12:32:27 05/18/14 (0)
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