Fiyuusyada nooca "KB, KU, KS" waxaa iska leh "K" iyo "T" nooca fiyuusyada sida waafaqsan heerka IEC-282. Waxaa jira saddex nooc: nooca caadiga ah, nooca caalamiga ah iyo nooca dunta. Alaabtani waxay ku habboon tahay 11-36kV fiyuuska ka baxa heerka korantada.