An indoor commercial hydroponics greenhouse is equipped with a 230 V230\text{ V}230 V mains electricity supply. The facility contains overhead high-intensity discharge (HID) grow lights, automated nutrient-solution misting pumps, space heaters, and portable testing equipment connected via extension reels.
Discuss three safety hazards associated with the use of mains electricity in this specific environment, explaining the physical principles or consequences behind each hazard.