Introduction
Whether its electrical, mechanical, or civil systems, maintenance is the key to long-term performance. The debate is always between preventive and corrective approaches.

1. Corrective Maintenance (Fixing After Failure)

• Repairs are done after breakdowns occur.

• Advantage: Lower upfront cost.

• Disadvantage: Unplanned downtime, higher long-term expenses.

2. Preventive Maintenance (Regular Checkups)

• Scheduled inspections, servicing, and replacements before failure.

• Advantage: Reduces downtime, improves reliability, saves money in the long run.

• Disadvantage: Requires planning and small upfront cost.

3. Which One is Better?
For critical systems like generators, transformers, HVAC, and solar plants, preventive maintenance is always better. Corrective maintenance can be used for low-priority equipment.

Conclusion
A smart combination of preventive and corrective strategies ensures reliability, efficiency, and cost control. Businesses that invest in preventive maintenance enjoy longer equipment life and fewer breakdowns.