Final answer:
Hot electrode holders should not be dipped in water because it could lead to electrocution; the water creates a conductive path for electricity, and the human body can conduct electricity well when grounded.
Step-by-step explanation:
Hot electrode holders must not be dipped in water by the welder or cutter because doing so may expose the worker to the risk of electrocution. Whenever a conducting object like an electrode holder is suddenly cooled, if it is still connected to the welding machine or source of electricity, it may create a pathway for electrical current to flow if there is any residual energy. Due to the high water content in the human body, it can act as a good conductor of electricity. Coming into contact with an electrical source while being grounded can result in a dangerous flow of current through the body, leading to electrical shock or electrocution. Therefore, the potential thermal hazard from a hot electrode does not translate to a safe condition even when cooling down with water as it introduces the risk of an electrical hazard.