Upon locating a defect, take immediate action. Ensure there is no electrical power source attached to damaged equipment before starting repairs.
If damaged or defective equipment cannot be repaired right away, it should be isolated, taken out of service, labeled clearly and locked up safely.
Place emergency equipment at regular intervals throughout the mine, and ensure that workers are trained on using it in case of an emergency.
Use a back-up electrical power source for critical support systems, to ensure they keep running even after the main power supply gets cut off.