A TIR cable is a physical security component used on certain trailers and containers to maintain load integrity during transport. It is commonly fitted to curtain-sided or tilt bodies where multiple access points must be secured together.
The cable itself is typically a plastic-coated steel wire that is threaded through aligned eyelets or holes in each curtain buckle once they are closed. When installed, it forms a continuous run along the side of the trailer, preventing individual buckles from being opened without first removing or breaking the seal attached to the cable.
This system does not physically prevent access, but it provides clear tamper evidence. If the cable has been cut, removed or re-threaded without a valid seal, it indicates that the load may have been accessed during transit.
TIR cables are commonly used on curtain-sided trailers operating under controlled transport conditions, as well as tilt trailers, open-top containers and other tarpaulin-covered bodies.
When not in use, the cable is typically wound onto a dedicated bracket or wrapper mounted on the front bulkhead. This keeps the cable controlled, prevents damage, and allows for consistent reinstallation.
Frequently Asked Questions
Does a TIR cable prevent theft?
No, a TIR cable does not prevent theft; it provides tamper evidence. If the cable or seal is broken or missing, it indicates that the load may have been accessed.
Where is a TIR cable fitted on a curtain-sided trailer?
It is threaded through the eyelets or holes in each closed curtain buckle along the trailer side, forming a continuous loop that is secured with a seal.
Do all curtain-sided trailers use TIR cables?
No, they are only used where required by the transport operation or for additional tamper evidence. Many domestic trailers operate without them.
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