ICC Residential Electrical Inspectors Practice Exam

In a grounded service supplied alternating current system, what type of main bonding jumper must be used?

1. Double insulated

2. Unslotted

3. Twisted pair

4. Solid core

The correct answer is: Unslotted

In a grounded service supplied alternating current system, the main bonding jumper must be unslotted. This type of jumper ensures a continuous and reliable connection between the grounding electrode system and the grounded neutral conductor of the electrical system. Using an unslotted main bonding jumper minimizes the risk of a poor electrical connection that could result from the potential for slots to create gaps or interruptions in the electrical continuity. This is crucial for maintaining safety and effectiveness in grounding, as it reduces the likelihood of ground faults or electrical shocks that can occur if a poor connection exists. Additionally, unslotted bond jumpers provide a larger surface area for conduction compared to other forms, ensuring that they can handle fault currents adequately without overheating or failing. This contributes to the overall reliability and safety of the electrical installation, protecting both equipment and personnel from electrical hazards.