When testing for absence of voltage, what is the correct sequence? Test the circuit once and proceed Test the instrument on known voltage, test circuit , verify instrument on knowr voltage Test the circuit twice Visual inspection only

The correct sequence is:<br /><br />**Test the instrument on known voltage, test circuit, verify instrument on known voltage.**<br /><br />### Explanation:<br />This sequence ensures safety and accuracy when testing for the absence of voltage. Here's why:<br /><br />1. **Test the instrument on a known voltage source:** This step verifies that your testing device (e.g., multimeter or voltage tester) is functioning correctly before you use it on the circuit.<br /><br />2. **Test the circuit:** After confirming the instrument works, use it to check the circuit for the presence or absence of voltage.<br /><br />3. **Verify the instrument on a known voltage source again:** This final step ensures that the instrument did not fail during the process and confirms the reliability of your test results.<br /><br />This method is often referred to as the "live-dead-live" test and is a standard safety practice in electrical work to prevent accidents caused by faulty instruments or incorrect readings.