| Which of the following precautions should be taken when troubleshooting various power circuits using an electronic voltage tester? |
| A) Never use this tester on circuits of 60 Hz, as the tester may not register the voltage. |
| B) Always remember that the unit is polarity sensitive and if used on DC circuits reversing the leads may result in high temperatures within the tester. |
| C) Never connect the device to circuits where potentials are greater than 120 volts. |
| D) Always check a known power source of the same type and voltage before using it to troubleshoot electrical equipment. |
