TSC0502G is a Toyota standard, and it belongs to a family of technical specifications that the manufacturer issues to its supply base under a single prefix, with the letters and digits that follow identifying the subject and the individual document. The designation is important to a supplier because it is the document named in the request for quotation: the obligation to comply begins at that point, and the specification that accompanies the enquiry states which of the manufacturer's standards apply to the part being quoted. Toyota requires the electromagnetic assessment of a component to be performed at a facility it has accepted, and the result to be reported in its own form, so the practical work of a first project with this customer is as much administrative as technical. A second Toyota standard appears on this site in the same family.