hospital grade or commercial grade receptacles ?

Buy yourself a bunch of Porterports and use them. Nobody has ever complained/regretted buying them.

Drobbins is right,
Tighter is better!!!! In so many things.
If you've ever plugged something into an old outlet, and had sparks shoot out,that's what a less than tight fit will do.I really feel the connections do more than the wire itself, providing the wire is a proper gage to begin with.

Let the battle continue.

Excellent advice and information, thank you to all.
I am thinking to go with isolated hospital receptacles on
a dedicated line with 12/3 wire. I will use one of the shielded wires as the ground (rapped in green tape at the ends) so as to pick up less, if any, interference as compared to the bare ground wire. Using the Isolated H.S.
grade receptacles will finish the isolated route and offer
a secure and tight fit at the wall. Does this make sense and sound correct ? Is a seperate ground, at the breaker box, needed for the isolation process to be complete for the dedicated line ?
Please keep the info coming. We are almost there !

Saki70..There isn't any shielded conductor in common 12/3 wire used in houses. What makes you think that green tape will stop "interference" better than bare wire? (Have you tried red tape?) Why not use the bare ground wire? This conductor carries no current except for leakage resulting from a fault in the neutral (white) wire. A safety issue.

Quality outlets are desirable because the elcheapo ones wear out and the contacts get loose. If the contacts get loose, so that the plug tends to fall out, then you do have a problem.

Search the archives for posts on power by Lak and Psychicanimal. You'll find ideas that go a good way beyond what you have planned, but if isolation is important to you, you might be happy to know about them.

One key point for me was the return or neutral (white) connection. When the electrician installed my dedicated line, he ran a separate hot wire from the breaker box for it but connected the neutral to a common bus. The isolation was only partial and I had to have it redone.