Final answer:
The subject of this question is engineering, specifically related to the bonding of electrical systems. A main bonding jumper is used to connect the grounded conductor to a grounding electrode or grounding electrode conductor.
Step-by-step explanation:
In electrical engineering, the subject in question is related to the bonding of electrical systems. A main bonding jumper is used to connect the grounded conductor of a system to a grounding electrode or grounding electrode conductor. A system bonding jumper, on the other hand, is used to connect together metal parts of electrical equipment and enclosures. When a service has more than one enclosure, a main bonding jumper must be sized based on the calculated fault current and the rating of the overcurrent protective device.