This Chinese standard covers the transients that reach a vehicle component through conductors other than the supply lines, adopted from the international method, and it addresses a condition that has become more important as vehicles have come to carry dense networks of data and sensor cabling: a transient generated by a switching load on one circuit is transferred to a neighbouring cable by capacitive or inductive coupling and arrives at a module through an input, output or communication port. In China the requirement is imposed through the component specifications issued by the vehicle manufacturers, which select the applicable amplitude and identify the ports to be tested, and the laboratory result is reported per port. The method uses either a capacitive coupling clamp, which induces the disturbance without galvanic contact, or direct injection through a series capacitor, and the report must state which was used for each port.