Cable ampacity is determined according to
IEC 60287 together with the method of installation as documented in IEC
60364-5-52.
Maximum Permissible Conductor
Temperature
Maximum Permissible Conductor Temperature
Normal Operation: 90oC
Emergency Operation: 105oC
Short Circuit: 250oC
Normal
Operation
Normal
operation is meant to be maintained through out a given period of
time everyday
or continuously, without affecting the operation.
Emergency
Load
Emergency
load is meant to be maintained for a short time under the
condition of
system breakdown or under the state of excessively loaded operation,
without causing a defect.
Short
Circuit
Short
circuit is meant to cause no defect of the cable when an irregular
current,
flows for short time due to shorting or earthing.
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