|
General Asylum General audio topics that don't fit into specific categories. |
|
|
|
General Asylum General audio topics that don't fit into specific categories. |
|
In Reply to: RE: Major ground loop problems after construction on new house posted by M-B on August 25, 2014 at 11:22:48:
Flexible metal conduit was then installed from the junction box to the outlets. Much of the conduit has shared wires in them. The wires were pulled after the conduit was installed.
Induced voltage onto the safety equipment grounding conductors caused by the loosely installed current carrying conductors in the flexible metal conduit multiplied by more than one dedicated branch circuit sharing the same conduit. A true dedicated branch circuit does not share the same conduit or cable with other branch circuits.
Starting on page 31 of Link provided below.
Quote:
The “Conduit Transformer”
• This finally explains what drives 99% of all ground loops!
• Load current in line and neutral produces opposing magnetic fields
since instantaneous current flow is in opposite directions
• Imperfect cancellation magnetically induces voltage over the
length of the nearby safety ground conductor
• Strongly affected by geometry and proximity of wires
• Highest voltages with randomly positioned wires in conduit
• Lower voltages with uniform geometry of Romex®
• Voltage is directly proportional to load current, wire length, and
rate of change in current or ΔI/Δt
• Mechanism favors high-frequency harmonics of 60 Hz
• For constant current in L and N, induced voltage rises at 6 dB/octave
The “Conduit Transformer”
Wires randomly positioned in conduit
produce the worst possible results!
http://centralindianaaes.files.wordpress.com/2012/09/indy-aes-2012-seminar-w-notes-v1-0.pdf
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- RE: Major ground loop problems after construction on new house - jea48 11:48:52 08/25/14 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2024, Audio Asylum, all rights reserved ]
