My electrical box has 4 spaces open for circuit breakers and I am
adding a new 20amp circuit for a basement outlet and light for my
computer. I have the permit and are working on the rough in. The
service is 200 amp and the house is 10 years old.
But when I look at the ground posts there are none open. I don't know
if some CBs use more than one or what or why they are all used
especially when there are 4 circuit breaker slots open. Can I double
up ground wires in the ground post holes? It looks like the ground
post has a slot the wire goes in and you tighten a screw to secure the
ground wire. The hole is big enough to put two in there but I want to
know if that is OK and legit. If not what are my choices. I really
don't want to add a new breaker box for one new circuit. Thanks for
any help!!!

Sheila