Conducting a live-dead-live testing is easier with a Proving Unit on hand. A Proving Unit generates a known voltage source, so that you can verify the functionality of your test tools before connecting to the panel.
Live-dead-live (aka: “three-point testing” or “LDL”) is the process of
- Testing (and confirming) the functionality of electrical testing equipment prior to beginning work.
- Testing the circuit to verify de-energized state.
- Re-testing the electrical test equipment to re-confirm functionality.
On conductors or circuits operating at 50 V or more, NFPA 70E requires visual inspection of test instruments and test leads for apparent damage before you begin a job. You must then verify your meter is working properly before going into the test area.
Watch the video for more information.
For more information on Electrical Safety, see our online course available at the Fluke eLearning Center.