Okay this is what i have at the moment. Their is a 120/208 volt main circuit panel which is grounded, from the panel their is a 1 1/4" EMT conduit running to a 6"x6" JB/PB, in this 1 1/4" Emt their is 10 circuit wires and 1 neutral wire (All this was existing) from this point i installed 1/2" Emt to a JB on the wire carousel (the carousel is an all solid steel structure with 2 - 1H.P motors they are feed with armour cable in the framing of the carousel. From the JB their is another armoured cable feeding the controls). In the 1/2" Emt with 3 wires as the carousel requires 3 phase 208v and draws 7.6 amps. No green wire was pulled in any of the emt piping fronm the main panel, the armoured cable has a green wire and is terminated under the ground screw of the JB and motor enclosure. I ran a #6 bare ground from the the carousel framing to the building steel frame structure for a bond in which i was told by the esa inspector that it was not required as the emt was sufficient for the bonding of all. To me and the way i read the code book a ground wire should be run all the way back to th emain panel to act as a ground for the motors and controls but obvoiusly i am interpertating this all wrong. I have read the code book section on grounding and bonding and i see it as any non electrical steel equipment should be bonded to a seperate grounded part of the ground system which should be the building structure ground and that the electrical equipment shall be grounded with a seperate ground back to the panel. I guess i have gotten my self really confused with this section of the code. is their any easier way to understand this section?
