The Fast-Rack FR-BJ-8.0-KIT is used to electrically bond two sections of Fast-Rack rail together at the spliced joint.
Bonding jumpers are required in solar installations where:
Mechanical splices are not rated to provide electrical bonding. Note that usually only one of the two lengths of rail under the row of modules needs to be bonded and then grounded. Check with your local electrical inspector for local building code compliance.