One thing that many find confusing regarding the control of hazardous energy is the actual hazard they are trying to render to a Zero Energy State (ZES). This is a simple concept, but many get it wrong in their programs and machine-specific procedures. Let’s take compressed air as an example. Many compressed air systems in manufacturing facilities will operate around 120 psi. We have a machine that uses this compressed air to move a guillotine cutting blade. To get the blade to a ZES, the air must be locked out and bled down to 0 psi (e.g., ZES).