A three-phase motor has unbalanced phase currents and repeated overload trips during commissioning. What should be done before changing overload settings?
- ABypass one phase
- BRemove equipment grounding
- Diagnose before changing overloads
- DIncrease overload settings until it runs
Where to look it up
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.305
Why C is correct
Investigate the supply, connections, load and motor condition. Preserve compliant overload protection while diagnosing the cause. Raising settings merely to suppress trips or removing grounding can leave a hazardous condition unresolved.