Grouding for dedicatied lines?

Hi, I just installed a dedicated power supply. From main breaker box from a 50 amp breaker I ran 6 awg romex to sub main box.Sub main box (8 breaker type) I used 4 20 amp breaker that were connected to same phase at this box which is important for best results.I ran seperate ground wire to sub main box to 10 foot ground rod (make sure electrician installs this seperate ground rod & doesn't tie into existing ground rod because this really lowers the noise.Note the 6 awg 3 wire romex between main & sub box the ground wire is connected from sub box to main box & seperate ground to outside rod is connected to sub box.I then installed 4 seperate dual gang (2 outlet) outlets. This made a big difference with quieter background, better bass and no annoying pops when ac unit or refrigerator cycles.Also I have great results using a Chang Lightspeed CLS 9600 ISO power conditioner everthing except amp is plugged direct to outlet for best results. Hope this helps it worked great for my ststem.

Although I agree that a separate ground wire and grounding rod to the sub-main box MAY lower noise, electrical code strictly prohibits this for the aforementioned safety reasons. You won't pass inspection if you do this. It doesn't sound like the original poster has the understanding to do some post-inspection reworking. Stay within code and just have the electrician upgrade your current main ground.

Thanks Metaphysics, for helping me make that point again. It seems some (well meaning no doubt) audiophiles just do not have a good understanding of the dangers involved with multiple grounding points. And as you've stated (and I as well), it is against National Electrical Code to do so.

DIYer's beware, your quest for better sound could cost you more than a few bucks. BTW, for reference, I am a licensed electrician and commercial contractor.

I just don't want to see anyone fry their gear, or themselves!

I'm using a single 20 amp circuit that uses an isolated ground outlet (ugly orange) and 12-3 BX back to main panel. Grounded to main buss bar. Got great (no noise) results and pretty cost effective. Red wire wrapped in green tape to designate ground. Maybe Gbeard can comment as to whether BX or conduit is over kill compared to romex (will certainly increase cost) and add a simple definition of "Star Ground".

Some schools of thought recommend monoblock amps be connected on opposite sides of main (common noise cancellation). General consensus in non-monoblock situations is to keep all lines on same side of main. May also be some benefit to locating potentially noisy house lines (those with motors, dimmers, computers, etc) on the opposite side of the main. My computer for example has it's own 15A (14-3)iso grd circuit on opposite mains side.

If you still have noise issues after a code compliant install look for the source by switching off suspect items. Deal with not generating the noise rather than floating the ground and risk floating to heaven.

I don't really think that BX, AC, MC cables, or conduit are probably any better than romex of reasonable gauge wire. #12 or #10 should be sufficient for most applications. Especially since the terminals for a 20 amp duplex receptacle are not designed to accept a conductor larger than #10. However, when entering the galaxy of the audiophile, anything is possible--as long as it is safe.

I don't really understand your comments about circuits being placed ahead of the "main". It must be a different definition of the word than what is common in the electrical industry. Nothing should be tapped ahead of the main circuit breaker (or fuse), unless it has its own main circ. breaker (or fuse) within the code approved distance per the tap rule. I am sure I am not discussing the same situation you are refering to.

I am not an expert on star grounding, but I believe it is a method of grounding electronic systems--audio, video, computers, etc.--that begins at one point in the system, and branches out to each piece of equipment in a star configuration. It can be very technical, and I am not well versed in its design criteria. However, I do know that the grounding point at where the "star" begins is itself grounded to the main grounding electrode (or mat in larger systems).

I hope this helps.