Ground tester


Posted on Jan 24, 2013

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
Click here to download the full size of the above Circuit.

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




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