Perform a damp heat cyclic test in accordance with ISO 16750-4.The system/components shall remain at room temperature for 0,5 h after the damp heat cyclic test.Apply a test voltage of 500 V d.c. to the DUT for 60 s, as follows, between:— terminals with galvanic isolation;— terminals and housing with electrically conductive surface with galvanic isolation;— terminals and an electrode wrapped around the housing (e.g. metal foil) in the case of plasticmaterial housing.For particular applications, the test voltage can be reduced to 100 V d.c. if agreed between customerand supplier.