Question 258Electricity & Electronics - 1st Asst/Chief

70% to pass

In order for a live-line tester to be used to test and prove dead a high voltage circuit, what must be done to verify the ability of the tester to detect a voltage?

AThe live-line tester should be checked by connecting to a known high voltage source only after testing the circuit to be worked upon.

BThe live-line tester should be checked by connecting to a known high voltage source only before testing the circuit to be worked upon.

CThe live-line tester need not be checked prior to testing the circuit to be worked upon as long as it has not been declared inoperative.

DThe live-line tester should be checked by connecting to a known high voltage source before and after the circuit to be worked upon is tested.

AI Explanation

The correct answer is D) The live-line tester should be checked by connecting to a known high voltage source before and after the circuit to be worked upon is tested. This is the correct answer because to verify the ability of a live-line tester to detect a voltage, it must be tested on a known high voltage source both before and after testing the circuit. This ensures the tester is functioning properly and can accurately detect the presence or absence of voltage in the circuit being worked on. Checking the tester only before or only after the circuit test, as in options A and B, does not fully verify its capability throughout the entire testing process. The other options are incorrect because option C does not require any verification of the tester's functionality, and option A only checks the tester before the circuit is tested, which does not confirm its continued proper operation.

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