Electric cables. Calculation of the current rating - Thermal resistance. Cables installed in ventilated tunnels Ingestion-build-141043 by adopting BS EN 251

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Electric cables. Calculation of the current rating - Thermal resistance. Cables installed in ventilated tunnels Ingestion-build-141043 by adopting BS EN 2511 Scope This part of IEC 60287 describes a method for calculating the continuous current rating factor for cables of all voltages installed in ventilated tunnels. The method is applicable to any type of cable. The method applies to natural as well as forced ventilation. Longitudinal heat transfer within the cables and the surroundings of the tunnel is assumed to be negligible. All cables are assumed to be identical within the tunnel and it is assumed