Inside of a breaker panel, how many ground wires can I secure under
a single screw in the ground bus? I'm running out of available
screws in the bus and wondered if I can put more than one ground
wire under a single screw (some are obviously for large gauge wire
and PHYSICALLY I could fit several #12 ground wires under a single
If more than one wire is permissible, what is the proper way to do this?
Twist the wires together then secure the under a single screw? Or would
I need to create a pigtail with a wire of a larger gauge and then put that
single wire under the screw (i.e. maybe join 2 #12 grounds to 1 #8 and
then secure the #8 under the screw?)
If none of this is permissible, can I somehow install an additional or
longer grounding bus?