Question about the 8:20 segment. Is the Final 'Live' check (following the 'dead' check) in the "Live, Live, Dead, Live" procedure specifically documented in NFPA 70E or is it an 'above and beyond' thing?
The steps for Establishing and Verifying an electrically safe working condition as outlined in NFPA 70E 120.5 are as follows: Step 1: Prepare for the job. Identify all sources of electrical supply, equipment, and circuits involved in the work. Step 2: De-energize the equipment. Follow proper lockout/tagout procedures to de-energize the equipment and isolate it from all energy sources. Step 3: Verify the de-energized state. Use appropriate test equipment, such as a voltage tester, to confirm that the equipment is de-energized. This is the "dead" test. Step 4: Perform the work. Once the equipment is confirmed to be de-energized, work can be performed on it safely. Step 5: Verify the absence of voltage. After completing the work, retest to verify the absence of voltage. This is the "live-dead-live" test, which involves testing for voltage to ensure that the equipment is still de-energized before removing lockout/tagout devices. Step 6: Restore the equipment. Once the absence of voltage is confirmed, the equipment can be safely restored to an energized state, if required, following proper procedures. It is important to note that the specific code language regarding the "live-dead-live" test can be found in NFPA 70E 120.5(D)(1) which states, "Verify the absence of voltage using a properly rated test instrument before and after each test, measurement, or diagnostic procedure, unless the absence of voltage is determined before and continuously monitored during the task by a qualified person."
Question about the 8:20 segment. Is the Final 'Live' check (following the 'dead' check) in the "Live, Live, Dead, Live" procedure specifically documented in NFPA 70E or is it an 'above and beyond' thing?
The steps for Establishing and Verifying an electrically safe working condition as outlined in NFPA 70E 120.5 are as follows:
Step 1: Prepare for the job. Identify all sources of electrical supply, equipment, and circuits involved in the work.
Step 2: De-energize the equipment. Follow proper lockout/tagout procedures to de-energize the equipment and isolate it from all energy sources.
Step 3: Verify the de-energized state. Use appropriate test equipment, such as a voltage tester, to confirm that the equipment is de-energized. This is the "dead" test.
Step 4: Perform the work. Once the equipment is confirmed to be de-energized, work can be performed on it safely.
Step 5: Verify the absence of voltage. After completing the work, retest to verify the absence of voltage. This is the "live-dead-live" test, which involves testing for voltage to ensure that the equipment is still de-energized before removing lockout/tagout devices.
Step 6: Restore the equipment. Once the absence of voltage is confirmed, the equipment can be safely restored to an energized state, if required, following proper procedures.
It is important to note that the specific code language regarding the "live-dead-live" test can be found in NFPA 70E 120.5(D)(1) which states, "Verify the absence of voltage using a properly rated test instrument before and after each test, measurement, or diagnostic procedure, unless the absence of voltage is determined before and continuously monitored during the task by a qualified person."