Isolated ground ?

[j-box]

How about the return to ground unity, I have see many tied to the panel, not a true isolated ground. The Nec Handbook has a nice graphic of the Isolated ground.

Can you post the NEC grafic please?

 

[satcom]

Can you post the NEC grafic please?[/QUOT
Nec 2002, Exhibit 250.55

Isolated ground design will differ for every building, for example if your installing a IG on the 40th floor of an office building, you may look for the isolated bus in the floor panel, this bus is feed from ground unity, in most cases at the buildings main switchgear, what you may see in many cases is the IG feed from the floor panel equipment ground, not a true IG connection point. In larger buildings the IG systems will most likely be engineered.

 

[Jerseydaze]

ahh...don't worry about it...it's only money...what the heck, write the check

Well that's it isn't it find a good way to do a job with out going crazy on the price.
I'm a little ignorant on the harmonics thing am I less likely to have problems with a MC cable or with NM