Grounding Transformer for Safety in High-Voltage Systems

Why is it necessary to ground the secondary conductor of a transformer delivering 12 volts?

A) To prevent electrical shock and damage to electrical equipment

B) To increase the voltage supply to the transformer

C) To decrease the current flow in the transformer

Answer:

A) To prevent electrical shock and damage to electrical equipment

Grounding the secondary conductor of a transformer delivering 12 volts is necessary to prevent electrical shock and damage to electrical equipment. When the supply voltage to the transformer comes from a 2-pole breaker in a 277/480 volt 3 phase 4 wire panelboard or a 1-pole breaker in a 277/490 volt 3 phase 4 wire panelboard, grounding provides a safe path for fault currents.

Grounding is crucial in high-voltage, three-phase systems to ensure the safety of both individuals working with the equipment and the integrity of the electrical system. Fault currents can be quite high in these systems, and without proper grounding, there is a risk of electrical shock, fires, and equipment damage.

By grounding the secondary conductor of the transformer, the fault currents have a designated pathway to flow, reducing the risk of accidents and protecting the equipment from potential damage. This safety measure is essential in maintaining a secure and reliable electrical system in high-voltage environments.