Current carrying capacity of RADOX® single core and multi core cables Standard conditions for current rating (IN [A]) The tabled values for the current rating were calculated according to IEC 60287 for the following standard conditions: • Continuous operation • Single circuit for 3-phase current, single conductor for 1-phase current • 30 °C ambient temperature and sufficiently large and ventilated spaces, whose ambient temperature is not appreciably increased by the heat coming from the cables. • 120 °C conductor temperature • Frequency up to 200 Hz Installation in air, unrestricted heat dissipation, means that the following installation conditions are observed: • Distance of the cables from the wall, from the floor, from the ceiling > cable diameter • Distance between two adjacent power circuits > 2 x cable diameter • Vertical distance between power circuits laid one upon another for individual cables > 2 x cable diameter and for layers of cables > 200 mm • Perforated tray with a perforation > 30 % of the total surface Open trays are continuous supports with vertical sides, but without cover. A possible perforation accounts for < 30 % of the total surface. Closed ducts are entirely closed. Pipes belong to this category also. The max. filling degree is 60 %. Maximum permitted conductor temperature for various insulating materials according to IEC 60216 (20 000 h/50 % elongation at break): PVC, CR PE-X, EPR RADOX 125 RADOX 155 70 °C 90 °C 120 °C 135 °C Life time expectation If crosslinked wires are used at higher temperatures than indicated by the temperature index of IEC 60216, the life time is reduced accordingly. Analogical, the life time will increase at lower temperature. RADOX® 125 for example has a life span of 20 000 h at a conductor temperature of +120 °C, which is approx. 2.5 years. If it is used at another temperature, life time expectations are as follows: Example RADOX 125, i.e. 120 °C/20 000 h 160 °C 150 °C 140 °C 130 °C 120 °C 110 °C 100 °C 90 °C 80 °C 1 250 h 2 500 h 5 000 h 10 000 h 20 000 h 40 000 h 80 000 h 160 000 h 320 000 h 90 HUBER+SUHNER Wires and cables
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