[Deep Cover]

250.24 b

(b) main bonding jumper. For a grounded system, an unspliced
main bonding jumper shall be used to connect the
equipment grounding conductor(s) and the service-disconnect
enclosure to the grounded conductor within the enclosure for
each service disconnect in accordance with 250.28.

After reading this the third time, maybe this isn't what you are looking for...

 

[Deep Cover]

Section 5 of 250 is where you want to look.

My previous response was not what you were looking for.