Magetsi amagetsi a AC amagwiritsidwa ntchito pa ring main unit (RMU) yokhala ndi ma frequency a 50-60Hz ndi voliyumu ya 13.8kV.Imatha kutulutsa ma siginecha olondola kwambiri omwe amagwiritsidwa ntchito poyezera ndi kuwongolera zida.Izi zimazindikira kuphatikiza koyambirira ndi kwachiwiri ndi ma switch osinthira kuphatikiza RMU, DTU komanso zida zina, komanso mawonekedwe ang'onoang'ono, opepuka, ochita bwino kwambiri, odalirika, kukhazikitsa kosavuta ndi zina zotero.