First, use a multimeter to check for leakage voltage. Set the multimeter to AC voltage mode, typically selecting the 250V range. Insert the black probe into the ground near the device under test, and touch the red probe to the metal casing of the equipment. Observe the multimeter reading. If the needle doesn't move, gradually switch to lower voltage ranges until a reading appears. This reading represents the leakage voltage. If no reading is shown even at the lowest setting, it likely means there is no leakage.
Second, use a neon tester or electrician’s pen to detect leakage. Hold the tester against the metal casing of the appliance. If the neon light inside the tester lights up, it indicates a high leakage voltage. However, if the light does not glow, it doesn’t necessarily mean there is no leakage—low leakage voltage might not be enough to trigger the tester. Always double-check with a multimeter for accuracy.
Third, in the absence of a multimeter or neon tester, you can gently touch the metal casing with the back of your hand. If you feel a tingling sensation or an electric shock, it suggests the presence of leakage voltage. Be very cautious—if you experience any shock, it may indicate a dangerous level of voltage. Immediately stop the inspection, identify the source, and fix the issue before using the device again. Never ignore these signs, as they could lead to serious electric shocks. Always prioritize safety when dealing with electrical equipment.
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