What is required for main bonding jumpers when the service disconnecting means consists of two to six compartmentalized disconnects?

In the context of grounding and bonding requirements, when the service disconnecting means consists of two to six compartmentalized disconnects, only one main bonding jumper is required.

This single main bonding jumper serves to connect the grounded service conductor to the grounding electrode system. Its purpose is to ensure that there is a low-resistance path for fault currents to flow safely to ground, thus reducing the risk of electrical shock and equipment damage.

It is important to understand that while multiple disconnects may be present, the regulations specify that a single main bonding jumper is sufficient to maintain proper grounding and bonding throughout the service equipment. This requirement aligns with the principles of safety and efficiency in electrical installations. The presence of multiple compartments does not necessitate additional bonding jumpers since their individual grounds can be effectively managed via this single connection point.