We build control rooms for customers. Our problem is that inside the room we are in an unclassified area and the 4/0 ground passes through the 1/4" steel plate floor to a ground pad on the skid which is in a Class 1 Div. 2 area. We have a seal which the 4/0 goes through. The seal is attached to the floor by a close nipple which screws into a Myers hub which is installed at the floor penetration. Recently we had the customer's inspector onsite and he flagged the seal because according to the NEC the seal should not have any couplings, fittings, etc., between the seal and the classified area. Does anyone have any insight on this subject?