For a European protection engineer this document answers a question that arises at commissioning rather than in the laboratory: whether a relay will behave correctly when its wiring runs alongside the conductors of a heavily loaded installation. The test reproduces the induced supply frequency voltage that appears on the relay terminals in that situation, and in European practice it is one item of a disturbance programme that the relay product standards require as a whole, so a device is normally assessed for this, for the burst, for fast transients, for surges and for conducted radio frequency disturbance within a single qualification exercise. The document fixes the source, the injection arrangement and the induced voltage levels used as severity steps, and it requires the protection function to be watched throughout the test so that any unintended operation is recorded. Acceptance follows the performance criteria the manufacturer has declared for the device.