How to correctly do dedicated lines for an apt?

I know these cleanpower/dedicated line threads have been discussed before. I'm been totally convinced of the importance of having dedicated lines. That's why I'm taking the plunge myself and having it done in my place. The only difference is that I live in an 667 unit 31 story hi-rise and can only go so far.( Can't change the ground,can't isolate the power from the pole transformer etc. etc.). Here's what I believe covers most everything. I want to be sure I've covered all the bases before I bring in an electrician to do the work
1) On concensus #10 solid wire is the best to use(cyroed or not)
2) Put in as many outlets as you can.You can never have too many.
3) My standard 100 amp box is all used up; so just run a sub breaker box from it.
4) Clean all the breakers and mains and apply something like SST for conductivity.
5) Use high quality duplex receptacles (cyroed or not).
6) THIS IS THE ONE I DON'T UNDERSTAND Put all the new dedicated lines on the SAME PHASE.
7)Put in some 30 amp breakers for your high current items.e.g. Power amps
8) Run an isolated ground from each outlet back to the box DON'T UNDERSTAND THIS EITHER
Well, that's what I know. Appreciate any other suggestions to do this right

Thanks for any and all input

Barry Montauk
What you need to tell the electrition is that you want a star ground system. That is where there is a dedicated line and ground wire for each outlet all the way back to the panel.

It sounds like to don't need to worry about the same phase becuse your panel is full anyway. When they hook up the sub panel they will put it on one of the 2 phases (each side of the 220). If you can get them to put the sub panel on and secondarys off of the power meter it will be even more isolated. If not have him pick the side of the phase (of the 220 that has the least amount of noisy stuff on it, like refirges,moters, air conditioners exc... good luck...
Item 1) okay

Item 2) No, you want to limit the number of outlets. Too many outlets can create ground loop hums.

Item 3) The only problem is you will need either a 2-pole breaker space or subfeed lugs in the main 100 amp panel to feed a new subpanel.

Item 4 & 5) okay

Item 6) Every panel has two colums and x number of rows. You want to put all your breakers in alternate row side by side or above and below depending on the wiring diagram. Electrician's job; he'll know.

Item 7) NEVER NEVER NEVER use a circuit breaker rated over 20-amps for convenience outlet branch circuits. Illegal and dangerous. Convenience receptacles can only handle 15 or 20 amps max. The purpose of circuit breakers is protection - not performance. Your landlord and his lawyer may take a dim view of this.

Item 8) You will need receptacles that are isolated ground rated and wiring with black (hot), white (neutral) and green (ground) wires. The green wire attaches to the receptacle ground. Simply run the green wire back to the subpanel. Install a seperate ground bus for the wires to attach to. Electrician's job for sure. Not an issue with Romex - romex wiring has isolated grounding.
Unless you OWN the apartment, don't waste your money, it will be difficult to get the owners to agree to, and possibly illegal if not approved!
Same phase because of (slight, but very serious) danger of a ground fault turning a cable or component into a 220V death trip.
With two different phases being used the potential, say from your sub on one phase, to your preamp on another is, if a power fault develops, and the unit is wired with the ground on the wrong pin, 220Volts running anywhere it can go to meet up. That is through cables, etc.
Also, the 220V differential potential could damage your electronics even if it never kills you.
(I had a preamp go crazy and have power supply circuit problems that were never solved, and I am pretty certain it WAS because I was using two legs in two separate outlets.)
It probably will NEVER occur to you or your equipment, but why take the unneeded and foolish risk associated with using both phases in one system.
Everything you want can be done from one leg of the circuit.
Also, I use the dedicated airconditioner 20 amp single outlet circuit for my stereo. The (new energy efficient) airconditioner is on another lone 15 amp circuit all by it's self.
There are few amps that require more than a 5 (five) amp circuit breaker let alone a thirty amp one. Wow!

10 gauge is overkill. Unless the run is extreme in length.