Just some food for thought. The most common corruptions of the IG are RS-232 cables used to inter-connect printers, modems, and CRT’s to your computer. RS-232 cables contain ground conductors and when your device is supplied by a different receptacle either standard or IG outlet, the whole IG system is compromised.
Another item that is over looked is IG should be dedicated. If there are multiple outlets on a branch circuit you defeat the purpose of an IG outlet. The only problem an IG circuit can prevent is common mode noise on the ground. And when IG’s are multiple you create common mode problems
One final point is do not waste money on installing an IG circuit in a residence. Best bet is to install a dedicated branch circuit. Reason is simple; in a residence a dedicated circuit is IG. Hence no conduit, plastic box mounted a wood frame member, and ran with NM.
