In a power supply situation, what must the neutral conductor be connected to in the second building?

In a power supply arrangement involving multiple buildings, the neutral conductor must be connected to the grounding electrode in the second building to ensure safety and proper operation of the electrical system. This connection serves several critical functions.

First, it helps to stabilize the voltage in the system by providing a reference point to ground, which can help reduce the risk of electric shock and electrical fires. Secondly, the bonding of the neutral to the grounding electrode is essential for establishing a return path for fault currents, thereby allowing protective devices, such as circuit breakers, to trip in case of a fault condition.

Connecting the neutral conductor to a grounding electrode further ensures compliance with electrical codes, which mandate that neutrals be properly grounded at each building's service entrance. This practice mitigates the risks associated with floating neutrals, which can lead to unsafe operating conditions.

In contrast, the other options do not fulfill this purpose or may not be appropriate for establishing a proper grounding and bonding system in the second building.