Design and Construction of Underground Cable Power Transmission Line

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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