The cable ampacity can only be specified for specific environmental conditions. If a cable rating is known for one set of environmental conditions, the tool determines the cable rating for different conditions. The cable rating tool calculates the cable ampacity factor from the standardized cable rating tables (based on the NEN1010 norm).
For a buried cable the environmental conditions are:
•soil temperature
•soil thermal resistivity
•depth
•whether the cable is placed in a duct
•number of parallel circuits
For a cable in free air the environmental conditions are:
•ambient air temperature,
•construction,
•presence of solar radiation,
•number of parallel circuits.
In case of other deviations, a calculation according to the IEC 60287 procedures should be performed.
The cable ampacity tool can be started by: Tools | Tools | Cable ampacity
The cable ampacity tool screen consists of two parts. The left part contains the base conditions for the cable ampacity, as denoted in the manufacturers data sheet. The right part contains the specific conditions for the cable. The result is reflected in the ampacity factor and the calculated Inom.
The result should be used as input for the specific cables, in the cable input form, the Ampacity factor can be filled in.
