Wannan shi ne yafi la’akari da zaɓin gudun ba da sanda kariya aiki. Babban –irin ƙarfin lantarki gefe sauri-karya kariya yafi kare babban laifin na’urar taranfoma. A takaice-kewaye darajar kewayon yanzu ba ya canzawa da yawa kuma daidai yake daidai, wanda zai faɗaɗa kewayon babban-irin ƙarfin lantarki Kariyar saurin karya gefe zuwa layin mai fita mai ƙarancin wuta, don haka rasa zaɓin zaɓi. Kariyar ya fi dogara bayan asarar zaɓi, amma yana kawo rashin jin daɗi ga izini. Misali, masana’antu da yawa yanzu suna da dakin rarraba wutar lantarki mai karfin 10KV (10KV busbar + mai fita da’ira mai fita), kuma kowane taron bita yana da dakin rarraba wutar lantarki mara nauyi (ring network cabinet + Transformer), idan na’urar ba ta kubuta daga matsakaicin. short-circuit current a gefen ƙananan wutar lantarki na gidan wuta, zai haifar da ƙananan wutar lantarki, (ring main unit load switch fuse), kuma na’urar lantarki mai ƙarfin lantarki zai yi aiki, wanda zai haifar da rashin jin daɗi ga aikin. .