A: Always follow the “live-dead-live” test procedure as per OSHA and NFPA 70E (2015), Article 110.4(A)(5), 120.1, and Annex G.
Sample procedure: With a properly rated test instrument, verify the test instrument to a known source, then insert the test probes into the R-3MT test point assembly to verify the presence of voltage. Next, open the isolator and proceed to verify the absence of voltage on the R-3MT assembly by measuring L1-L2, L1-L3, L2-L3, L1-G, L2-G, and L3-G. Once you have verified voltage absence, re-verify the test instrument to a known source.
This live stream with EMEA Business Development coordinator, Chris Schneck, covers how to perform a live-dead-live test with GracePESDs. Chris also demonstrates and explains how our Permanent Electrical Safety Devices (PESDs) play a role in your live-dead-live test to maximize productivity and safety.
"Live-Dead-Live" testing is mandated by OSHA when voltages are above 600 volts. It is also required by the NFPA 70E in Section 110.4(A)(5), Operation Verification, as well as Section 120.1(5), Verification of an Electrically Safe Work Condition.
Read more in our blog: How to Perform and Enhance a Live-Dead-Live Test