Current is normal, but a newly coupled motor vibrates excessively. Which mechanical checks should be made?
- AReverse neutral polarity for the described C-10 installation and documented operating conditions
- BRemove overloads
- CIncrease breaker rating
- Alignment, mounting, bearings, balance, and load
Why D is correct
The best answer is: Alignment, mounting, bearings, balance, and load. Mechanical problems can damage a motor even when electrical current appears normal. Alignment and load checks should precede electrical protection changes. This transferred field condition tests the same installation or safety principle in a different project context. The other choices conflict with the cited rule, listing, safe-work process, or necessary diagnostic sequence.