Live dead live check

Data records

• A live-dead-live check is the sequence in which a voltage tester is verified on a known live source, used to confirm the absence of voltage on the circuit under test, and verified again on the known source; the two verifications establish that the tester was working when it read the circuit as dead. Source: Electrical Testing Reference editorial taxonomy, 2026-10 edition. Verified 2026-10-27. Record gloss.live-dead-live-check.definition
• A proving unit is a pocket-sized battery-powered voltage source used to confirm that a voltage tester responds to a known live source before and after a measurement, the sequence the maker calls test before touch; it does not remove the need for protective equipment when the absence of voltage is being verified on the circuit itself. Source: Fluke product page, web page edition. Verified 2026-10-27. Record gloss.live-dead-live-check.usage