Resistance
Product pages give for each cable type the maximum direct current (DC) resistance of the
conductors and the messenger at a temperature of 20 °C and the alternating current (AC) resistance
of the phase conductor at the operating temperature.
Inductance
Inductances are approximate values. Inductances are given in the form of
inductance/phase.
Inductance values have been calculated assuming that phase cores are laid up around the
messenger and touching each other.
Each product page contains information about current carrying capacities in given conditions.
These values are valid for a separate multi-core cable.
The basic assumptions of current carrying capacities are given in the following sections. If
the conditions differ from the assumed premises, the load current values shall be calculated with
professional software.
Conductor temperature
The current carrying capacities have been calculated in continuous operation at the maximum
permissible temperature of the conductor.
Surroundings
The ambient air temperature is 25 °C. The air shall move freely around the installed
cable.
Wind velocity is 0.6 m/s and the direction of the wind is perpendicular to the cable. Solar
radiation is 1000 W/m².
Higher ambient air temperature or solar radiation will decrease the current carrying capacity
of the cable.
