In the safety regulations for refrigeration equipment, the grounding system is known as the "lifeline," and its importance is no less than any core component. However, in practical installations, the practice of simply connecting the ground wire to a building wall instead of installing a dedicated grounding electrode is becoming a latent safety hazard.The core of a qualified grounding system lies in establishing a low-impedance leakage path. 

      When equipment experiences leakage current or accumulated induced charges, the grounding electrode can rapidly channel dangerous currents into the earth. Wall grounding may seem convenient, but it has a critical flaw: the resistance value of building walls typically far exceeds standard requirements. The resistivity of concrete is hundreds of times higher than that of soil, making it impossible to form an effective ground.In humid environments, this problem is drastically amplified. Highly humid air significantly reduces insulation resistance, making equipment enclosures more likely to carry induced voltage. If the grounding is ineffective, these electrostatic charges can continuously interfere with the sensitive electronic components of temperature controllers, causing temperature reading drift and abnormal control commands, seriously affecting refrigeration accuracy.More dangerously, when insulation aging causes leakage current, ineffective grounding can electrify the equipment enclosure. If a person comes into contact at this point, the current will seek an irregular path—potentially passing through the human body to the ground. According to electrical principles, a current of just 30 mA passing through the human body for 0.1 seconds is enough to induce ventricular fibrillation.A dedicated grounding electrode, achieved by burying copper rods or galvanized steel pipes deep underground, ensures a grounding resistance of less than 4 ohms. 

        This value is a strictly calculated safety threshold, guaranteeing that the protection device cuts off the power within 0.4 seconds in the event of a fault. In contrast, wall grounding resistance often reaches tens or even hundreds of ohms, rendering leakage protectors ineffective.Grounding is not a procedural formality but a technical measure to ensure personal safety. Before each equipment startup, it should be confirmed that the grounding system is truly "grounded," not just "wall-connected." Do not let a corner-cutting ground wire become a fuse that threatens lives.