What defines the TT grounding method?

The TT grounding method is characterized by having the customer's grounding system being separate from the grounding system of the supply authority. In this method, the customer's ground is typically a local earth electrode system, such as a ground rod or plate, which is directly connected to the earth independently of the supply authority's ground system. This separation is critical as it enhances safety by providing a low impedance path for fault currents without relying on the utility's grounding system, which can improve the overall reliability and safety of the electrical installation.

Understanding this approach is essential, particularly concerning grounding practices and safety measures in electrical installations. It ensures that faults are cleared effectively and minimizes the risk of shock or fire hazards that could arise if the grounding systems were interconnected without due consideration of their individual specifications and safety mechanisms.