This is an excellent way to wire AC power.............................................
The twisted pair wiring used for each circuit has the neutral and hot wires wrapped together on 2" centers and the ground wire placed parallel in PVC conduit. An AES paper presented at the AES 129th Convention, 4-7 November 2010, San Francisco, CA, USA states this method has the lowest ground voltage induction of anything tested.
Bill teaches a wonderful class at CEDIA conferences in the fall on this topic. It is worth its weight in gold. This year CEDIA is in Dallas, TX: http://expo.cedia.net/. No one I have seen has such a strong grasp of this topic than Bil as a practical matter.This is an excellent way to wire AC power.
The Bill Whitlock paper:
"Ground Loops: The Rest of the Story"
Bill Whitlock, AES Fellow and Jamie Fox, P.E.
This paper was presented at the AES 129th Convention, 4-7 November 2010, San Francisco, CA, USA
ABSTRACT
The mechanisms that enable so-called ground loops to cause well-known hum, buzz, and other audio system
noise problems are well known. But what causes power-line related currents to flow in signal cables in the first
place? This paper explains how magnetic induction in ordinary premises AC wiring creates the small voltage
differences normally found among system ground connections, even if “isolated” or “technical” grounding is
used. The theoretical basis is explored, experimental data shown, and an actual case history related. Little
has been written about this “elephant in the room” topic in engineering literature and apparently none in the
context of audio or video systems. It is shown that simply twisting L-N pairs in the premises wiring can
profoundly reduce system noise problems.
http://xa.yimg.com/kq/groups/20963848/268252969/name/Whitlock-Fox+-+Ground+Loops+.pdf
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