Verification by the authorized employee that the previous steps of the procedure have effectively isolated the machine or equipment must be done prior to starting the servicing or maintenance work.  The authorized employees need to verify that:

  1. the machine or equipment has been turned off or shut down properly;
  2. all the energy-isolating devices were identified, located, and operated as needed;
  3. the LOTO devices have been attached to the energy-isolating devices; and
  4. the stored energy has been rendered safe.

Comments   

+1 #3 Chris Devine 2013-08-21 23:53
Thanks Bryan for a great summary of the topic. Of course there is a real opportunity for the machine attempt start method to produce unreliable results. I suspect that is why voltage indicators are gaining traction. What are your thoughts on DeadEasy from Redbusbar?
+1 #2 Bryan Haywood 2011-04-27 16:53
I will cover your question in a post this week about the DIFFERENCES in an operator verifying ZES and a qualified electrical worker verifying ZES. In the meantime I will check out this device and let you know my thoughts on using it.

Bryan
+1 #1 Arthur Shrope 2011-04-25 22:49
What about using "thru-door" voltage detection units (like GRACE's ChetVolt/ VoltageVision combo unit) to verify zero energy state?

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