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?
• Proving dead procedures for high-voltage circuits • How to ensure a test instrument itself is working when checking for dangerous voltage • The safety value of checking equipment at more than one point in time
• If the tester is faulty, when could that most dangerously mislead you – before testing, after testing, or both? • How can you be sure the tester did not fail partway through the job while you were relying on it? • Think about a safe sequence: known source → unknown circuit → known source. What is each step telling you?
• Verify which option ensures the tester works immediately before it is applied to the circuit under test. • Verify which option would reveal if the tester failed during or after testing the circuit. • Eliminate any choice that allows you to rely on the tester without confirming it works on a known live source.
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