Final answer:
The 250.28 Main Bonding Jumper and System Bonding Jumper are terms used in the field of electrical engineering to connect metal objects together in electrical systems, providing a path for electrical current to safely flow.
Step-by-step explanation:
The 250.28 Main Bonding Jumper and System Bonding Jumper are terms used in the field of electrical engineering. In electrical systems, bonding jumpers are used to connect metal objects together to create a path for electrical current to safely flow in the event of a fault or electrical surge. The main bonding jumper connects the grounded conductor (neutral) to the grounding electrode system, while the system bonding jumper connects the equipment grounding conductor to the grounding electrode system.
For example, in a residential electrical system, the main bonding jumper may connect the neutral wire from the electrical panel to the grounding electrode system, such as a metal water pipe. This helps to ensure that any stray electrical current can safely return to the ground. The system bonding jumper, on the other hand, may connect the metal electrical box and the metal casing of an appliance to the grounding electrode system to prevent electric shock hazards.