Wiring main panel box for dedicated 20amp line.


I'm getting ready to install a dedicated 20 amp line and came across something I wasn't expecting. I have a single GE main panel box that's about ten years old. When I opened the box I was expecting to see neutral wires at one bus bar and the ground wires attached to the other, with the black wire - of course - attached to the circuit breaker.

Instead, I found the neutral and ground wires for each outgoing wire attached to the same bus bar on adjacent screws. I've since read that this is common practice and apparently up to code on a main panel.

To install a new 20 amp line, I could duplicate this setup with adjacent vacant spots on one of the bus bars and a new breaker, but I'm wondering if using a common bus bar for both the neutral and ground wires is suitable for a hi-fi application? The whole idea is, of course, to have a dedicated, properly grounded circuit for my gear. Also, if it's not ideal, would a small sub-panel be a desirable solution?

I'd be grateful for anyone's expertise. Thanks!
grimace

Showing 4 responses by gvasale

The electric panel is an extension of the great parallel connected network. You really don't want all of the breakers on say the left, & nothing on the right. Each side is fed from one of the pair of live wires in the feed. You're better off, if you really need another 20 amp circuit to do it on the opposite side.
T1s49: Vistualy every electronic device uses a power supply where you know, AC is converted to DC...

There hasn't been any issues with phasing of DC that I've ever heard of. Maybe I just don't have the experience...

Maybe I just need to hook up the old Techtronics scope and watch the sine wave for a few hours, sort of like watching the test pattern fot TV in days gone by...
So, you have a hypotheticaly 220v amplifier, If you say the transformer (pole) has a split phase secondary, then the amp should have ground loop & other indescribable issues?

I go back to the ground is the same ground, no matter what & the phase is normal (single), Not split, or would ac motors not run, right? Motors, capacitor start, "split' phases themselves, right?

Going back to the power supply, all are rectifying AC to DC and usually have full wave rectifcation and hopefully adequate filtering, of one or two stages & regulation too.

I can't download your link yet, but I'll keep trying.

This, and I don't mean to offend anyone, is really kind of out there if you know what I mean.
Jea48: Like I said, not trying to offend anyone, but I've never experienced any problems with ground loops. Also, this seems to have a lot of opinions running in both directions. I did get to thet website by just going the the short ***.com and viewed what was availabele. Just like those who swear by and others who swear at power conditioners.

I also did a web search on ground loops and again never had "sound bars" on video or any other symptoms of the problems. I guess I'm just lucky... But we so have three wire 220/240 distribution 110 ground 110 feed. Just over time the voltage has gone up to 120 ground 120. And measuring shows it can run a little higher.

Are you upset because I don't have their problems? Is it like when you own a Mercedes everything about it comes with Mercedes prices? Sorry, really.

It's almost like the greater the progress in this hobby the greater the problems.