I've seen Metal roofing, Trailer skins, & Pole building metal engerized . So it can & does happen/
Another example they add on to a block building with structal steel and block BUT the two sections of building Old & new (steel) are not tied togerther. Thus one sided bonded other is not expect by conduits & mechical pipes. I;d say Bonding jumpers between the two seperate steel sections is required . Otherwise your depending on conduits ect to bond your steel,

Last edited by Yoopersup; 11/10/09 06:35 PM.