Article 100 Bonding Jumper, Main.
Code Change Summary: Revised code definition.
In the 2020 NEC®, the definition of a main bonding jumper (MBJ) was revised to clarify that the MBJ connects the grounded circuit conductor to the equipment grounding conductor, or the supply-side bonding jumper, or both, at the service.
Previously the definition did not mention the supply-side bonding jumper which is also bonded to the equipment grounding conductor or busbar at the service.
Below is a preview of the NEC®. See the actual NEC® text at NFPA.ORG for the complete code section. Once there, click on their link to free access to the 2020 NEC® edition of NFPA 70.
2017 Code Language:
Article 100.
Bonding Jumper, Main. The connection between the grounded circuit conductor and the equipment grounding conductor at the service.
2020 Code Language:
Article 100.
Bonding Jumper, Main. The connection between the grounded circuit conductor and the equipment grounding conductor, or the supply-side bonding jumper, or both, at the service.