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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: RE: Isolated ground is a separate issue. posted by crossram2x4@aol.com on November 4, 2008 at 17:07:05:
A standard outlet connects the AC ground wire to the back strap, and thus to the metal wiring box. The steel framework of a large building may be at a slightly different potential than the AC ground. If the wiring box is attached to the steel framework, the ground loop thus created may carry large currents and upset the operation of sensitive equipment plugged in to that outlet.
An isolated-ground outlet keeps the outlet grounds attached only to the AC ground wire from the local service panel, and breaks the ground loop. The building wiring has to have another ground for the wiring box. This configuration is not something that should benefit a typical home audio system.
I'm sure some people use them to provide a separate earth connection for the audio system's AC. This is illegal and can be very dangerous. If the system AC earth connection is physically separated from the main power earth connection, a nearby lightning strike can cause brief offset voltages of several thousand volts between the two earth connection points. This is caused by very large currents flowing laterally through the earth.
This spike can flash over and destroy your equipment. Worse, it can set the remains on fire.
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Follow Ups
- Isolated ground is for use in large facilities. - Al Sekela 14:29:32 11/05/08 (0)
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