On Dec 23, 9:33*pm, "Steve Barker"
wrote:
so obviously never from one box to the next?

s

"RBM" wrote in message

...They could each be nippled out of a gutter trough where they would be
bugged onto the service main feeders, as one possible example

Not quite never but rarely, Some panels have multi barreled lugs for
use as the main lugs and there are kits available from some
manufacturers that will add such lugs to an existing panel. These
allow you to run service entry tap conductors from one main lug to
another. Additionally some panel cabinets have sufficient room to
house separate lugs, split bolt taps, and so forth. Were the panel
cabinet has enough room you can avoid the need to install a trough.

--
Tom Horne