What is the tripping current for an unbalanced circuit condition in reference to an overload?

The tripping current for an unbalanced circuit condition in reference to an overload is defined as a threshold that ensures the protection of the electrical system from sustained overload conditions that may occur when one phase carries a significantly different current than the others. The correct choice reflects an industry standard wherein the tripping current is set at 80% of the current for the three phases.

This value is selected to provide a safeguard against overheating and potential damage to the equipment, while also allowing for some tolerance in the system for temporary unbalanced conditions that might occur during normal operation. By using 80% as the reference, the system can effectively detect when an overload situation is developing without being overly sensitive to small fluctuations that don't pose a risk.

Understanding this parameter is crucial for maintaining safe operation in a three-phase electrical system, as it helps prevent scenarios that could lead to failure or equipment hazards.