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Absence of Voltage Testing – An Update on Accepted Approaches

Absence of voltage testing is a vital step in the process of verifying and establishing a de-energized state of any electrical system. There is a specific and approved approach to establishing an electrical safe work condition with the following steps:

  • determine all possible source of electrical supply
  • interrupt the load current, open the disconnecting device for each possible source
  • verify where possible that all blades of the disconnecting devices are open
  • release or block any stored energy
  • apply lockout device in accordance with documented and established work procedures
  • using an adequately rated portable test instrument to test each phase conductor or circuit part to verify it is de-energized. Test each phase conductor or circuit path both phase-to-phase and phase-to-ground. Before and after each test, determine that the test instrument is operating satisfactorily through verification on any known voltage source。

Post time: Jun-01-2021