Lock / Tag / Try


Lock / Tag / Try (LTT) – Zero Energy, formally referred to as Lockout/Tagout, establishes the minimum requirements for safely isolating potentially hazardous energy sources during maintenance and servicing activities.  LTT is designed to protect personnel from the unexpected energization, start-up, or release of energy from machinery and equipment during maintenance, repair, servicing or modifications. 

All employees and contractors who maintain or service equipment are subject to LTT.  Failure to implement these practices can result in significant injury.

Written Program

Ltt Image

Lock / Tag / Try Forms


Training Requirements

Lock / Tag / Try training is required before any ND faculty or staff begins performing service or maintenance tasks that require Lock / Tag / Try. Refresher training is required annually. 

Personnel who operate machines or will be working in the area of an active lockout are required to take "Affected Employee" training. This training is required only once unless ND's LTT procedure changes.

Both Authorized and Affected Training can be assigned through complyND; the course names are:

  • RMS Lock Tag Try - Affected
  • RMS Lock Tag Try - Authorized

Regulatory Requirements

OSHA CFR 1910.147 The Control of Hazardous Energy (lockout / tagout)

Contractor Requirements

All contractors performing work at the University of Notre Dame shall train their authorized employees in Lock / Tag / Try and shall provide proof of training when requested by ND.

Contractor authorized employees must be familiar with the ND Lock / Tag / Try procedure. The ND contractor point of contact must ensure that communication of the ND LTT program happens prior to the contractor employees working at the University of Notre Dame.