- Install, maintain and repair electrical control, wiring, and lighting systems. 2. Read technical diagrams and blueprints. 3. Perform general electrical maintenance. 4. Inspect transformers and circuit breakers and other electrical components. 5. Troubleshoot electrical issues using appropriate of testing devices. 6. Repair and replace equipment, electrical wiring, or fixtures. 7. Follow National Electrical Code state and local building regulations. 8. Circuit breaker corrective maintenance. 9. Good knowledge of heating and air conditioning systems. 10. Valuable knowledge of various test equipment.