What is the Main Bonding Jumper (MBJ) and How to Size it?
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5 Questions
Question 1 of 5
What is the primary safety function of the Main Bonding Jumper (MBJ) regarding fault currents?
The MBJ creates an effective fault-current path back to the source, allowing the circuit breaker to trip quickly during a ground fault.
Question 2 of 5
According to the NEC, where should the Main Bonding Jumper be installed within an electrical system?
The neutral and ground must be bonded at only one point in the electrical system: the main service disconnect.
Question 3 of 5
What is the correct configuration for neutral and ground conductors in a subpanel?
In subpanels, the neutral must remain isolated from the cabinet and the equipment grounding conductors.
Question 4 of 5
Which of the following describes the sizing requirement for a Main Bonding Jumper?
Per NEC 250.28(D), the MBJ size is determined by the size of the largest ungrounded service-entrance conductor.
Question 5 of 5
Which component serves as a common form of the Main Bonding Jumper in modern load centers?
In modern panels, a green bonding screw is the standard component used to bond the neutral busbar to the metal enclosure.
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