Originally Posted by
Reis Pearson
I realize that there is the possibility that they are using the metal conduit as the grounding electrode, but how do I know that??
By looking at the conduit, you should be able to tell metal from PVC, if not, take your screw driver and 'scrap' the conduit part you can see, if it is metal, your screw driver will just slide, if PVC, it will dig into the PVC (if the screw driver edges are not all rounded off.
A better and safer way is to take a multimeter (or any voltage tester device, even those neon lights, except their leads are usually too short) and test for voltage from the hot main lugs to neutral (you should get around 120-125 volts each leg), then from the hot main lugs to the enclosure (you should get the same thing), then from the hot main lugs to the inside the conduit (you should get the same thing - if you don't, either the conduit is not metal, or it is metal and just not grounded).