Final answer:
Working 'one-handed' with high-power electric tools is a safety measure to prevent the completion of an electric circuit through the body, reducing electric shock risk. A frayed cord on a power saw poses a serious risk and should be repaired before further use.
Step-by-step explanation:
Electrical Safety and Power Saws
When working with high-power electric circuits or tools like power saws, the advice to work 'one-handed' or to 'keep one hand in your pocket' is a safety precautionary measure. Doing so minimizes the risk of creating a circuit through your body, which could lead to a serious electric shock. If both hands are in contact with different points that have an electrical potential difference, it would allow the electric current to pass through the body. By using only one hand, you lessen the chance of completing the electric circuit through yourself.
Another important safety measure is to inspect the equipment before use. If you notice a frayed cord on a power saw, you must stop using the saw immediately. A frayed cord can expose you to live wires, which increases the risk of electric shock, especially when operating the saw with both hands or near damp or conductive surfaces.
Always ensure that proper maintenance is performed and safety precautions are followed to avoid potentially life-threatening hazards. If any fault, such as a frayed cord, is noticed, it should be repaired or replaced by qualified personnel before the tool is used again.