Two main International Standards supports the use of “Zero Energy” to reduce hazards in Machineries:
ISO 14118: Safety of machinery - Prevention of unexpected start-up (Latest edition: 2017)
ANSI ASSE Z244.1: The Control of Hazardous Energy Lockout, Tagout and Alternative Methods (Latest Edition: 2016)
Hazardous energy includes energies generated by Electrical, Pneumatic Hydraulic, gravity, chemical, combustion gasses (Methane) etc…