Final answer:
To prevent electric shock, power tools should be operated with proper electrical safety systems and devices such as a ground fault interrupter (GFI) and an isolation transformer, as well as practical safety techniques like working one-handed to avoid creating a dangerous current path through the body.
Step-by-step explanation:
To prevent electric shock, power tools should be operated with the proper electrical safety systems and devices. Electric power tools pose thermal and shock hazards, and precautions need to be taken to avoid these dangers. One important measure is using tools equipped with a ground fault interrupter (GFI), which prevents shock by swiftly cutting off the power if a loss of current is detected, suggesting an unintentional path such as through a person's body.
Additionally, utilizing an isolation transformer can provide a layer of safety by insulating the power tool from the main power source. Another practical advice is operating with caution, such as working one-handed to prevent creating a current path across the heart which is a high-risk factor for shock hazard. It is critical to ensure that power tools have proper grounding and are used according to their safety instructions to prevent accidents.