Three Pin Socket Tester. Home Utility Circuit.19

3We use a number of Three Pin Sockets in our home. It has three connections- Phase, Neutral and Earth. Earth connection is an important safety measure to bleed the leakage current if any from the device using. In a Metal bodied device, if there is current leakage, there is the possibility of shock hazard . So the Earth connection should be intact to bleed the leakage current. How can we check whether the Earth connection is intact or not. The AC Tester check will not give the result because there is no current in Earth line. No problem, this tiny circuit will confirm whether the Earth connection is intact or not. The Green LED lights if the earth connection is intact, otherwise not. It is too simple, and can be enclosed in a Three Pin Socket itself.
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Earth Fault Indicator. Design Note 17


This is my circuit published in Electronics For You Magazine. I have designed this circuit for checking the Earth connection in the power sockets ,whether it is intact or not. Earth connection is a must in power sockets especially if the gadget connecting has a metal body. If there is any leakage from live wire, the earth connection will bleed the current to earth and protect us from shock. So this circuit can be used to check the power sockets before using gadgets like Heater, Electric Iron etc. It also indicates whether there is power in the socket and the polarity of Phase and Neutral is correct.
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