Izi zitha kugwiritsidwa ntchito m'nyumba ya Ac50Hz ndi voliyumu yovotera ya 3.6-40.5KV kuti ipangitse voteji muntual-inductor kuchokera pakutsitsa ndikupumira kwa dera. (Yoyesedwa ndi National high-voltage quality Supervising and Testing Center, malinga ndi GBI5166. 2 ndi IEC282-1)