The Electrical Systems of Roadway Tunnels: Safety Design and Ecomanagement


This paper discusses the design criteria for the electrical systems of roadway tunnels with specific regard to the security within the daily operation and in the case of fireside events. It proposes a fit distribution system and an adaptive criterion for the support lighting system so as to minimize costs and energy impact. Electrical systems of roadway tunnels need refined design to permit the presence of extensively distributed hundreds and more stringent installation necessities thanks to the presence of fireplace hazard. Mechanical and electrical design criteria should be based mostly on equipment qualification classes (EQCs), that are characterised by thermal inherent resistance and environmental parameters. Design criteria should include variable configurations to simplify installation, allow versatile operation, and optimize the price–profit ratio. A special power distribution, herein outlined as “brush distribution,” and a temperature zone classification are proposed for road tunnels with a higher risk in the case of a hearth event. So, this paper suggests as design parameters the temperature exposure levels characterizing the thermal demand in every zones and the EQCs in order to choose the equipment with adequate thermal resistance.

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