Electrician's Licensing Practice Exam

What is required by NEC Section 250-28A?

1. A neutral grounding connection

2. A main bonding jumper and a system bonding jumper

3. A circuit breaker panel

4. Surge protection devices

The correct answer is: A main bonding jumper and a system bonding jumper

NEC Section 250.28(A) specifically requires the installation of a main bonding jumper and a system bonding jumper as part of the overall grounding and bonding requirements for electrical systems. The main bonding jumper is critical because it connects the grounded (neutral) conductor to the grounding system at the service equipment, ensuring that any fault currents can safely return to the ground. This helps to stabilize the system and minimizes the risk of electrical shock and fire hazards. The system bonding jumper, on the other hand, is used to bond the grounded conductor to the grounding electrodes and provides a low-impedance path for fault currents. Together, these components ensure a well-grounded system, which is essential for safety and compliance with electrical codes. Other choices such as a neutral grounding connection, a circuit breaker panel, and surge protection devices, while important in their own contexts, do not cover the specific requirements outlined in NEC Section 250.28(A). It focuses solely on the bonding mechanisms that are essential for grounding practices to ensure system safety.