In a 120/240-volt, single-phase, 200-ampere service, what is required for the main bonding jumper connection to the service equipment enclosure?

In a 120/240-volt, single-phase, 200-ampere service, the main bonding jumper must connect the neutral conductor to the service equipment enclosure. This connection is crucial for ensuring that the neutral is effectively bonded to the grounding system, which provides a path for fault current.

When connected to the service equipment enclosure, the bonding jumper helps in maintaining the safety of the electrical system by ensuring that in the event of a fault, the fault current has a low-resistance path to ground, which facilitates the operation of overcurrent devices like fuses or circuit breakers.

Moreover, for systems that include multiple disconnects, the bonding jumper must connect to all disconnects serving the premises to ensure that there isn't any potential difference that could pose a shock hazard. This is why establishing a reliable connection to both disconnection points is necessary for safe operation and compliance with the National Electrical Code (NEC) standards. Without this connection, the system could potentially have ungrounded conditions which compromise both safety and functionality.