TS_TG1-030-1 appears in the component specifications issued to suppliers of one or more Chinese vehicle programmes, and the designator indicates a technical specification series belonging to a single manufacturer. Designations of this form are internal to the purchaser and are not published, so a supplier's knowledge of the document comes from the controlled copy issued with the enquiry and from the correspondence that follows it. The trailing group of digits in a specification of this kind usually distinguishes the parts of the series from one another, so a programme will invoke more than one of them and the supplier should obtain the set rather than the single number that appears on a drawing. The requirement itself states the electromagnetic conditions applicable to a component and the report the supplier must submit.