Isolation is to set valves, electrical switches, energy storage accessories in the appropriate position or with the help of a specific fastener to make the equipment can not operate, and then the system to perform the locking program. Put the "energy" in proper isolation before starting any work. Every unconventional or hazardous work requires energy isolation to be considered. The energy required for isolation must be specified first. The energy isolation scheme shall specify or illustrate the isolated energy, isolation points and locked-in areas.