Eddy,

Code requires a independent ground from the conduit. Too many cases of conduit coming uncoupled and interrupting the ground. This was not always the case, using the conduit as a ground used to be legal.

That and the underground run is plastic, the shop has metal conduit.

87 Turbo Intercooled Raider, roller cam, torsen rear diff, LSD front diff, lockup auto with modified converter, V6 brakes, low transfer case gears...