New York Low Pressure Boiler COF Practice

When providing an isolation transformer, what must one conductor of the secondary winding be?

1. Insulated

2. Grounded

3. Disconnected

4. Overrated

The correct answer is: Grounded

When providing an isolation transformer, it is essential for one conductor of the secondary winding to be grounded. This grounding serves several important purposes. First, it enhances the safety of the electrical system by providing a clear path for fault currents, thereby protecting both equipment and personnel from electrical shock or damage. Grounding helps to ensure that any fault conditions lead to the operation of protective devices, such as circuit breakers or fuses, which can de-energize the system quickly. Additionally, grounding one side of the transformer reduces the risk of electrical noise and interference in sensitive applications, as it establishes a reference point for the electrical system. This practice contributes to system stability and reliability, which is crucial in many industrial and commercial settings. In contrast, while insulation is necessary for safety and performance, merely insulating a conductor does not provide the protective benefits of grounding. Disconnecting a conductor would disrupt the circuit, and overrated conductors do not address the essential requirement of ensuring a safe and effective electrical system. Therefore, grounding one conductor of the secondary winding effectively meets regulatory requirements and best practices in electrical safety.