Re: UL Service Entrance Panels
I beleive you are right in your thoughts, in that there should be no bonding in the panels IF you pull an EGC.
As far as the phrase "suitable for use as service equipment" goes, if the panel includes a device that may be used as a main bonding jumper (screw, strap or other) it is listed as service equipment.
If there is an EGC, yes the installer needs to remove the bond at the panels, and no, it wouldn't void the listing.
If you do not have an EGC, make sure there are no metallic paths between the strucures. Also, you mentioned this is a 480Y/277 setup. If you have a breaker in the main that is over 1000 Amps, GFPE will be required as per 230.95, making the EGC between the two buildings a requirement, not an option.
Ryan Jackson, Salt Lake City