How to conduct live-dead-live testing
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.
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