Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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It looks from the drawing youv'e given that there is a ground loop concern.

Posted by Ugly (A) on January 11, 2007 at 06:49:20

In Reply to: balanced transformer grounding question posted by NotoriousBIG_PJ on January 9, 2007 at 20:02:09:

For example if the "Case Ground" connection is terminated at a metal case (shielding) on this "Line Filter" black box and that metal case isn't tied electricaly to the AC return, then OK sweet no problem you are all good. BUT... If it is tied to the AC return and the earth ground like your drawing implies then it seems there is the potential for a ground loop and the problems that go with them.

Of course I've made a couple of assumptions here which will usually be true since these important details werent provided but please be sure and correct me on these if they are wrong. First assumption: "Case Ground" gets tied to earth ground wire on the "Power Cord". SEcond assumption: "Power Cord" is a three wire cord which has third prong not lifted. Third assumption: The house wiring is up to recent code standards, ie 3rd prong ties at box to AC return and to earth at the panel.

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