If an energy isolating device is not capable of being locked out, can the employer use a tagout system?

• Yes, if an energy isolating device is not capable of being locked out, the employer's energy control program must use a tagout system. [29 CFR 1910.147(c)(2)(i)].
  
  If an energy isolating device is capable of being locked out, must the employer use a lock out system?
  
  Yes. Unless the employer can demonstrate that the tagout system will provide full employee protection, as described in paragraph (c)(3) of the standard.
  [29 CFR 1910.147(c)(2)(ii)].(The employer may choose to use a tagout system as long as the requirements for additional training and periodic inspections are met.)