Chingwe chogawa magetsi kapena sub-transmission network chomwe chimagwiritsidwa ntchito ngati choyambira ku Commercial, Industrial and network networking.Yoyenera pamakina olakwika okwera mpaka 10kA/1sec.Zomangamanga zomwe zidavoteredwa ndi zolakwika zapamwamba zimapezeka mukafunsidwa.