Evaluating Risk
After recognizing a hazard, the next step in the Electrical Safety Model is to evaluate the risk associated with that hazard.
Risk = Probability + Severity
To evaluate risk, consider two main factors:
- Probability – The likelihood that a hazardous event will occur. This can be expressed as a percentage or ratio.
- Severity – The extent of harm or damage that could result if the event occurs. Severity often depends on the potential for injury or property damage and can be fatal in electrical hazards.
Using a Risk Matrix
A risk matrix helps visualize how probability and severity combine to define overall risk. The closer you are to the danger zone (e.g., live wires, energized equipment), the higher the probability of exposure.
Example:
- Exposed wires 15 feet off the ground: Low probability if you are working at ground level; injury is unlikely.
- Exposed wires near a roof: High probability if you are working at elevation; a fall combined with contact could result in fatal injury.
Additional Factors That Increase Risk
- Multiple hazards: Working around improperly grounded equipment and a damaged tool increases the chance of injury.
- Environmental conditions: Wet surfaces or conductive materials amplify electrical hazards.
Key Takeaway: Evaluate each hazard in context. Consider both how likely an incident is to occur and the potential consequences. Use this assessment to take appropriate precautions and stay safe.