Answer:
Water
Using appliances while standing on a damp or wet surface.
Wearing helmets
Poisoning
Step-by-step explanation:
Water is not a flammable substance. This means that water cannot be set on fire. However, water is extremely conductive of electricity. This is why using appliances while standing on a damp or wet surface can cause an electric shock. On the other hand, wearing helmets is an adequate preventative safety measure. However, it is not a measure that would help you in an emergency. Finally, poisoning can result from improperly using items such as cleaning materials, medicines and paint.