All holes to accept hangers are 3" on-center and 0.56" diameter (to accept 3/8" diameter hanger bolts).
Mounts to vertical web of beam. Bracket is 2 1/2" wide by 3/8" thick.

Mounts to top flange of beam. Bracket is a 2"x 2" angle, by 3/8" thick. The first hole is 1 1/4" from the end.

Single-iron weldment, used for heavier conductor bar (e.g. 1500A)

Mounts to vertical web of beam to configure conductor bar one above the other. Bracket is 2 1/2" wide by 3/8" thick.