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12 <strong>Cable</strong> Construction & Continuous Current Ratings<br />
3.00 <strong>Cable</strong> Construction &<br />
Continuous Current Ratings<br />
The continuous current capacity is calculated in accordance with IEC 60287.<br />
Laying Conditions<br />
1) Ground Temperature : 25<br />
2) Depth of Laying : 1.5m<br />
3) Soil Thermal Resistivity : 1.0 m/W<br />
4) Ambient Temperature : 40<br />
5) Max. Conductor Temperature : 90<br />
6) <strong>Cable</strong> Formation : Flat (S=2D)<br />
S : Distance between cables / D : <strong>Cable</strong> diameter<br />
7) Frequency : 50Hz<br />
8) Load factor : 100%<br />
Maximum Permissible Conductor Temperature<br />
Normal Operation Emergency Operation Short Circuit<br />
90 105 250<br />
1) Normal Operation<br />
Normal operation is meant to be maintained through out a given period of<br />
time everyday or continuously, without affecting the operation.<br />
2) Emergency Load<br />
Emergency load is meant to be maintained for a short time under the<br />
condition of system breakdown or under the state of excessively loaded<br />
operation, without causing a defect.<br />
3) Short Circuit<br />
Short circuit is meant to cause no defect of the cable when an irregular<br />
current, flows for short time due to shorting or earthing.
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