How long is the validity period of an interlocking mandatory ticket?

The time limits for sequential operation tickets are purely a matter of internal unit management. The sequential operation ticket should include the start and end times for approval of the work, as well as the actual start and end times of the work. It’s best not to use custom times, as it can lead to misunderstandings. Combining sequential operation time with sequential importance can form management levels, which are reviewed and approved by different departments and supervisors. For consecutive operation times, the shorter ones should preferably be completed within the same shift, while the longer ones should not span more than one shift change. To avoid lapses in shift handover. For consecutive long-term deactivation (over the duration specified on a work order), special approval is required, and a separate work order must be issued for the timing of activation and deactivation. .