The project I am doing was visited by the Electrical Engineer today and he stated that I need bonding bushings on ALL concentric / eccentric knockouts regardless of voltage. He says this is code, I can only find where they are required over 250 volts to ground. I also have 6 transformers on the project. I ran Emt to within aprox. 4 feet then changed over to greenfield using a 90 degree fitting into the side of the transformer. He says that this no longer allowed that I am supposed to pipe them in hard.( Emt right into the transformer) I have always used a short run of flex ,due to vibratation. Been doing it this way this for 23 years. There is a room where there will be oxygen bottles stored and attached to a distribution manifold. He has speced out standard receptacles , light switches, and surface mounted strip lights. I asked him if this room should be class 1 division 2 ? His response ... a blank stare then he said no it's no problem.
What do you guys think ?