A) You might receive an electric shock from stored charge in large capacitors
Capacitors store electrical energy. This energy can be released quickly through contact and are thus a shock hazard.
- Avoid working on energized electrical equipment or circuits.
- Test capacitors with a suitable voltmeter and discharge before working on or near them.
- Use suitable insulators during the discharge process.
- After discharging the capacitor verify that there is no residual charge with a suitable voltmeter.