35.110 Networking. Including local area networks (LAN), metropolitan area networks (MAN), wide area networks (WAN), etc. / Организация сети

33.040.50 Lines,. Including access networks and network elements / Линии, соединения и цепи. Включая сети доступа и сетевые элементы

91.140.50 Electricity. Including electric energy meters in buildings, emergency electrical supplies, etc. / Системы электроснабжения. Включая аварийное электроснабжение и т.д.