Only by adopting protective grounding can the personal safety during use be ensured. If there is no protective grounding, once the shell leaks electricity, the water at the outlet of the diving cooler pump and the water surface for pumping will be charged, endangering the safety of humans and animals, and wasting a lot of electric energy. If the metal casing of the diving cooler pump is connected to the grounding body (grounding resistance not greater than 4Ω) that meets the national standard, when the casing of the diving cooler pump leaks electricity, the current will pass through the metal casing of the diving cooler pump, the protective grounding wire, the grounding body, the earth, The working ground wire of the transformer and the power supply form a closed loop. When the leakage current is too large, especially when the live wire touches the case, the protection device of the diving cooler pump can be activated (the fuse is blown or the air switch is tripped), and the leakage current diving cooler can be cut off. The power supply of the pump.

The diving cooler pump works in water, and it is easy to leak electricity and cause power loss or even electric shock accidents. If a leakage protector is installed, as long as the leakage value of the diving cooler pump exceeds the operating current value of the leakage protector (generally not exceeding 30 mA), the leakage protector will cut off the power supply of the diving cooler pump.