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verifying
There is an industry "best practice" for verifying the absence of voltage. This is described in NFPA 70E, the standard for electrical safety in the workplace that most employers base their electrical safety programs on. In addition, this is the standard that OSHA often cites when enforcing electrical citations. The 70E standard requires that until it can be proven otherwise, the user must treat equipment as energized. The process of proving a de-energized condition exists involves putting on PPE and after locking/tagging out the equipment using a voltage tester, often times a digital multimeter, testing it on a known source to ensure that the tester is working, going to the panel believed to be de-energized and testing for voltage phase-to-phase and phase-to-ground, then re-verifying that the meter or tester is still functioning. Once all of these steps have been completed, it is safe to remove the PPE and go about the planned work.
PTM Published on: 2017-08-01