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<blockquote data-quote="Mike Sokol" data-source="post: 63965" data-attributes="member: 1989">Re: Lighting system causes buzz/hum in the circuit breaker panelsI just did a sound consult at a church over the weekend that had all sorts of system hum, and I suspect that at least some of the ground loop current is due to non-isolated ground Edison outlets in metal boxes tied to metal studs in the wall and sub-panel double G-N bonding. Lucky for them they have a licensed electrician in the church so I gave him a check list of things to look for this week. He&#039;s going through every sub-panel looking for extra neutral/ground bonds and swapped G-N wires, identify all metal outlet boxes tied to the building frame, and will be moving the metal amp rack over so a steel tension cable isn&#039;t dragging on it anymore. He&#039;s to report back to me in a few weeks with what they&#039;ve found, and I&#039;m betting he&#039;s going to discover at least a few &quot;Bad Neutraling&quot; things. :lol:</blockquote>

[QUOTE="Mike Sokol, post: 63965, member: 1989"] Re: Lighting system causes buzz/hum in the circuit breaker panels I just did a sound consult at a church over the weekend that had all sorts of system hum, and I suspect that at least some of the ground loop current is due to non-isolated ground Edison outlets in metal boxes tied to metal studs in the wall and sub-panel double G-N bonding. Lucky for them they have a licensed electrician in the church so I gave him a check list of things to look for this week. He's going through every sub-panel looking for extra neutral/ground bonds and swapped G-N wires, identify all metal outlet boxes tied to the building frame, and will be moving the metal amp rack over so a steel tension cable isn't dragging on it anymore. He's to report back to me in a few weeks with what they've found, and I'm betting he's going to discover at least a few "Bad Neutraling" things. :lol: [/QUOTE]

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