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Questions about 120v breakers. 

Question asked by shaney on Apr 12, 2018
Latest reply on Feb 7, 2020 by keith.w.raffel

I am an electrical novice.


  • In and industrial setting, is it required by NFPA 70/70E to lockout a 120v standard breaker (like a household breaker), where the breaker has not been designed to take a lock?
  • Is a tagout device acceptable for standard 120v breakers?
  • Does it matter if the equipment was designed pre- or post-1990?