Question 1 of 10
What is the primary function of the Main Bonding Jumper (MBJ)?
The MBJ creates a low-impedance path for fault current, connecting the neutral to the ground system and the panel enclosure.
Question 2 of 10
Where is the Main Bonding Jumper (MBJ) typically located?
The MBJ is only required at the main service equipment.
Question 3 of 10
What is the consequence of not having a Main Bonding Jumper (MBJ) or a faulty MBJ?
Without a proper bonding path, fault current may not be sufficient to quickly trip the overcurrent protection.
Question 4 of 10
What is connected to the neutral busbar in a main service panel?
The neutral busbar is the point where the grounded conductor, grounding conductors, and the grounding electrode conductor are interconnected at the service.
Question 5 of 10
What is the proper method of bonding in a subpanel?
In subpanels, the neutral and ground must be kept separate to prevent parallel paths for fault current.
Question 6 of 10
According to the article, what is a typical form of the Main Bonding Jumper (MBJ)?
A green bonding screw is commonly used to connect the neutral busbar to the panel enclosure.
Question 7 of 10
What is the purpose of the grounding electrode conductor (GEC)?
The GEC connects the electrical system to the earth, providing a path for fault current and stabilizing voltage.
Question 8 of 10
Where should the neutral and ground be bonded in an electrical system?
The neutral and ground must only be bonded at one point, which is the main service disconnect.
Question 9 of 10
How is the size of the Main Bonding Jumper (MBJ) determined?
The MBJ size is determined by the size of the service entrance conductors, as specified in the NEC.
Question 10 of 10
What does the MBJ help to establish?
The MBJ helps to keep the neutral conductor at earth potential, thereby reducing the risk of shock hazards.
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