Grounding is connected from transformer tanks and metal-clad equipment to earth to reduce what?

The purpose of grounding transformer tanks and metal-clad equipment is primarily to reduce shock hazards. By connecting these components to the earth, any stray voltage or fault current can be safely dissipated into the ground. This significantly lowers the risk of electrical shock to individuals who may come into contact with the equipment or nearby conductive surfaces, thereby enhancing safety in electrical installations.

Grounding ensures that in the event of a fault, such as a short circuit, the electrical system can direct the excess current away from users and into the earth, which prevents the buildup of dangerous voltage levels that could pose a threat to life. Therefore, it is a critical aspect of electrical safety protocols to protect both personnel and equipment in various environments.

While electrical noise can be mitigated through proper grounding techniques, this is not its primary purpose. Overcurrent and voltage drop considerations are also important elements in electrical theory and practice, but they are not specifically addressed through grounding alone and do not directly relate to the intention behind grounding transformer tanks and metal-clad equipment.