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Adjusting Earth Fault Loop Impedance (EFLZ) values is essential primarily to ensure compliance with safety regulations. This is because these values directly relate to the safety and effectiveness of an electrical installation in preventing electric shock and ensuring proper functioning of protective devices.

Regulations often dictate specific EFLZ values to ensure that under fault conditions, the protective devices, such as circuit breakers or fuses, operate correctly to disconnect the supply quickly. If the EFLZ is not adjusted properly, it might lead to a situation where the protective device fails to trip in the event of an earth fault, increasing the risk of electric shock, fire hazard, or equipment damage. Therefore, maintaining EFLZ values within prescribed limits is critical for safeguarding human life and property, thereby aligning with national and international safety standards.

Adjustments for compliance ensure that all installations meet the necessary codes, which are designed to protect against electrical hazards. While factors like installation time, circuit design, and system performance are important in their own right, they do not take precedence in the context of safety regulations, which is paramount in electrical installations.