Thank you all for your responses! As some of you guessed right the house is very old with just 2 prong sockets (ungrounded). However, I know that there is a ground bar at the fuse box which would be very difficult to fish in order to tie the two ground bars togheter. Tjtrout20 suggestion seems to be the way to go. Thanks again!
Two physical grounds??
Due to construction issues the only way to ground my line conditioner is by instaling a dedicated ground rod for it (i.e. the house outlets are of type that accept a 2 prong plug). This dedicated ground rod for the line conditioner will be about 16 feet away from the ground rod for the electrical wiring for my house. By doing this would I get into trouble regarding a "ground loop".