First, use a multimeter to check for leakage voltage. Set the multimeter to the AC voltage setting, 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's display. 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, you can use a neon tester or voltage detector to check for electrical leakage. Hold the tester against the metal casing of the device. If the neon light inside lights up, it indicates that there is a leakage voltage, and the level may be high. However, if the light does not glow, it doesn’t necessarily mean there’s no leakage. It could simply mean the leakage voltage is too low to trigger the tester.
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 a mild electric shock, it suggests there is a leakage voltage present. Be extremely cautious if you experience any form of shock, as it may indicate a dangerous level of leakage. In such cases, stop the inspection immediately, identify the cause, and resolve the issue before using the device again. Failing to do so could result in serious electric shocks or accidents. Always prioritize safety when dealing with electrical equipment.
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