A TS number on a specification points to a specific, versioned document, and citing the wrong version is a common, avoidable source of dispute between designer and contractor.
What a TS number actually points to
TSE, the Turkish Standards Institution, publishes and periodically revises standards covering materials, testing methods, and construction practice, and each is identified by a TS number that may also carry a year suffix marking a specific revision, such as TS EN 206 for concrete or TS 500 for the design and construction of reinforced concrete structures.
Citing a bare TS number without the revision year leaves room for ambiguity if the standard has been revised since an earlier project used it, and a specification should state the version actually being applied.
Where TS aligns with EN standards
Many Turkish construction standards are national adoptions of European EN standards, indicated by the TS EN prefix, meaning the technical content matches the European standard while carrying a Turkish reference number, and a specification citing TS EN 206 is citing the same technical document a European engineer would recognise as EN 206.
Where a standard is purely Turkish, without an EN prefix, such as TS 500, it reflects local practice and code requirements specific to Turkey and does not have a direct European equivalent to fall back on.
The practical habit
Verifying the current, active version of any cited TS number against TSE's own published catalogue before finalising a specification is worth the few minutes it takes, since a contractor working from an outdated version and a designer expecting the current one is a dispute that is entirely preventable.