The commissioning table shows unbalanced phase currents and repeated overload trips. What should be done first?
- ABypass one phase
- BRemove equipment grounding
- Diagnose before changing overloads
- DIncrease overload settings until it runs
Why C is correct
Current imbalance can rapidly overheat a motor; raising protection without correcting the cause risks damage and fire. The best answer is therefore “Investigate supply, connections, load, and motor condition before changing overload settings.” The other choices either address a different system, rely on an unsafe shortcut, or make a conclusion not supported by the stated facts.