Before by-passing a voltage regulator, it must be in which position?

The correct position for a voltage regulator before by-passing is the neutral position. When a regulator is in neutral, it signifies that it is not actively engaged in the circuit, allowing any voltage flowing through the system to pass without modification or interference. This is crucial for safety and equipment protection during the by-pass process, as it ensures that there is no voltage regulation occurring at the time of the procedure.

In the on position, the regulator is actively controlling voltage, which can pose safety risks and lead to potential damage to both the equipment and personnel if by-passed without first placing it in neutral. The off position implies a complete disconnection, which could cause unexpected circuit behavior. The by-pass position suggests a state already prepared to bypass the regulator, which would be an incorrect state for initial preparation. Thus, using the neutral position ensures a smooth, safe transition to by-pass the voltage regulator.