Earthing Connection Tester For Electrical Lab Training

Earthing Connection Tester - For Electrical Lab Training In all electrical appliances where there exists a likelihood of any accessible metal part becoming live in the event of any insulation fault, adequate provision has to be made to connect such parts permanently and reliably to an earthing terminal or termination within the appliances, or to the earthing contact of the appliance inlet. Any such connection shall be robust enough to bear a likely short circuit current without getting damaged or burnt out. Also, the resistance of such earthing paths shall also be within a specified limit.   The Earthing Connection Tester has an arrangement to give a specified high current at a low voltage and an ammeter to measure the current and a voltmeter to measure the voltage drop in the earthing path, thus enabling determination of its resistance. It consists of a variac to give a variable voltage, a step down transformer to provide the specified current at a low voltage, an ammeter to indicate the current passing through the earthing path, and a voltmeter to indicate the voltage drop in the earthing path.