Trapped key interlocks
Enhancing lockout tagout procedures with trapped key interlocks ensures energy isolation procedures cannot be circumvented. The trapped key interlocks can aid in isolating the energy source and the lock and tag can be applied to the interlock. The key is removed from the trapped key interlock and is with the person leading the lockout tagout procedure. The equipment cannot be re-energized until the uniquely coded key has been re-entered into the sequence after all workers are clear from the completed task. A time delay unit can be added into the process to allow the hazardous energy to dissipate prior to allowing access.