Generally, if possible, troubleshooting is done with a disconnected power supply, but in some circumstances, faultfinding is only possible if the circuit is live. Therefore, the circuit under testing remains connected with the power supply.

This uses the circuit power supply itself as a source of energy for testing. This kind of testing should be done with extreme care following safety precautions.

As shown below, the integrity of a power supply or continuity of electric path can be checked by using test lamps. Test lamps are connected in between two phases. Thus, as with the dead circuit test, a continuity test can be performed.

In addition, a lamp-type visual tester can be used for simple continuity testing. Alternatively, voltage indicators or multimeters can be used for checking voltage and the continuity of the conductors or electrical path.

While checking three-phase voltage, use two lamps connected in series and not a single lamp. Currently, most manufacturers give test voltage details for test points that helps to check the integrity of a particular section.

Generally, equipment consisting of electronic cards follow this kind of practice. While checking the voltage at these test points, measuring instruments must be accurate. Therefore, a comparison of voltages at these test points is sufficient to draw conclusions.

Diagnostics for a single-phase motor can be undertaken with this kind of visual indicators. This requires a sound knowledge of circuit and wiring arrangements – depending upon the test done, interpretation varies and so does an accurate fault diagnosis.

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