Open invitation to tender, deadline 25.03.2016, for the delivery and installation of Medium Voltage Systems in the control center for four tunnels on the H3a Silvaplana bypass. The duration of the contract is from 01.03.2017 to 01.03.2018. For further information go to http://www.simap.ch/shabforms/servlet/Search?NOTICE_NR=900625. Contact Tiefbauamt Graubünden, Coira, tel 081 257 37 16,fax 081 257 21 57, e-mail submission@tba.gr.ch. Collegarsi a http://ted.europa.eu/udl?request=Seek-Deliver&language=it&docid=52391-2016, GU S 032 . Ref. n. N01.12 080159. 07/16.