B21 7110 is a component requirement of the French manufacturer Peugeot, issued in a series whose designator identifies the class of document and whose number identifies the individual requirement. The French vehicle industry has historically written its component requirements in a form that combines the electrical and the electromagnetic assessments in a single family of documents, and the standards have been carried forward through the groups of which the manufacturer has formed part, so a supplier may meet the same number in the specifications of more than one brand of the group. A requirement of this kind states the conditions under which a component is assessed at its mounting position and cites the test methods by which the conditions are applied, and the tests are performed at a laboratory accepted by the manufacturer.