The calculated service load is within the ampere rating, but available fault current exceeds the service breaker interrupting rating. Is the installation acceptable?
- AYes; load current is the only rating that matters
- BYes; a larger grounding electrode fixes the interrupting rating
- CYes; adding a warning label increases breaker capacity
- No; adequate fault-current ratings are required
Why D is correct
Normal load and fault duty are separate checks. Service equipment must safely withstand and interrupt the available fault current; grounding-electrode size or labeling cannot increase a breaker’s tested interrupting capability.