pg62 put all your source equipment on one line via one outlet strip and put your amp on the other. Float the ground to your amps using cheaters.
Let's see how that works.
Let's see how that works.
Why did you use hospital grade MC cable?
For audio 10-2 with ground would have been better.
Problem with hospital grade MC cable there are 4 wires. one Hot, one neutral, and two equipment grounding conductors. The geometry of the way the 2 equipment grounding conductors are installed in relationship to the current carrying hot and neutral conductor makes it more possible that a voltage is induced onto the equipment grounding conductors.
Did the electrician terminate both circuits on circuit breakers on the same Line, leg, in the electrical panel? Both on Line 1 or both on Line 2?
One of the circuits has a "crackling" sound.That sounds like a loose connection. Could be a faulty circuit breaker, or a poor connection between the breaker to the connecting bus tie in the electrical panel.What type/manufacturer panel is it?
You should not have "a crackling sound" coming from your AC line and if you do, it suggests something faulty in the installation, such as a loose connection. I’d have your electrician check all of his work.
Did you take out a construction permit for this work? In many municipalities in the U.S. such a permit would be required. If so, your code inspector may be helpful in identifying the issue.
The crackling is a real issue. Please have it checked, you may have arcing somewhere.
The other issue, is one I have warned about before. Having too good of a connection to the panel means you may get closer to any noise from outside.
A better solution may be to run 240 to your room, and then use a step down balanced transformer, like from Equitech, to feed your gear. This is fairly cheap to do, as you've already run the wiring. Just need a new, dual pole breaker and appropriate outlet.
Before you call your electriticians, there is something for you to try.
Turn off every other breaker in the home. If the noise persists, it's on the line, or from the outside. If it all goes away, it's coming from elsewhere in the home.
If your breaker box is old, you may also want to ask about arc detecting breakers.
AC Power Wiring Types (cont’d) Metal Clad (MC)is manufactured in both steel and aluminum with twisted conductors that help reduce AC magnetic fields. Although the steel jacket helps reduce AC magnetic fields, the twisting of conductors has the greatest effect on reducing these fields. Another benefit is the constant symmetry of the phase conductors with respect to the grounding conductor which greatly reduces voltage induction on the grounding wire. (NEC article:330)Integrating Electronic Equipment and Power into ... - Middle Atlantic
Read pages 31 thru 35
Great feedback everyone. Much appreciated. I took the hospital grade MC cable recommendation from my electrician. Jim, I think I need to read that passage several more times to get the gist of it, I have a call into my electrician and will share the wisdom found here. Thank you all. I'll let you know how this turns out. Pete
Sometimes audio components sound far better on the same star grounding scheme. So by splitting your system across two separate lines back to the breaker box, some type of ground loop issue is occurring.
Have you tried feeding everything using the one power point, and does that make any difference?
Re: Hospital grade wiring, I would ditch it. Hospital grade does not mean good. For example hospital grade duplexes means a duplex that can withstand constant water splashing from cleaners washing the hospital rooms each day. In order to not corrode from the water, the metal in a hospital duplex must be all nickel plated, which is the worst sounding plating for audio systems.
This is a good example of how 'hospital grade' is good for its stated application, but awful for high end audio.