Ground tester

  
This circuit checks the reliability of appliances so that the equipment may be used safely. The test circuit must be plugged into a properly wired three terminal wall outlet. When a two-lead or three-lead appliance is plugged into circuit outlet SOI, neon lamps NE1 and NE2 will light if the appliance is safe
Ground tester - schematic

If neon NE2 is lit the appliance is dangerous, because the neutral lead is 110 Vac above ground.




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