I have a question I have been pondering. I am installing a 2000A 480/277Y switchboard that has multiple metering capabilities. Section one is the utility pull section. To the right is section two a combination meter and 100A disconnect for “house power.” Section 3 is a meter/ 1000A disconnect for TI power. Section 4 is a distribution section for the TI Power. The un metered bus runs through sections 1,2 and 3 with bus tapping off to the service breakers at sections two and three. The ground bus runs continuous through all sections with the grounding electrode conductor connections in the 1000A main sections. The 1000A breaker has ground fault protection. There is future provisions for two 400A meter mains to the left (and around a corner) of the utility pull section. My question is this: Do I connect the main bonding jumpers in both the 100A main section and the 1000A section? Or do I just connect one because the ground bus is continuous to all sections. [Linked Image]