Standard: IEC 60055-2
PAPER-INSULATED METAL-SHEATHED CABLES FOR RATED VOLTAGES UP TO 18/30 KV (WITH COPPER OR ALUMINIUM CONDUCTORS AND EXCLUDING GAS-PRESSURE AND OIL-FILLED CABLES) PART 2: GENERAL AND CONSTRUCTION REQUIREMENTS
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This standard specifies general requirements and construction for impregnated paper-insulated lead-sheathed cables with copper or aluminium conductors (excluding gas-pressure and oil-filled cables) having rated voltages ( Uo / U) from 0.6/1 kV to 18/30 kV.
It does not include submarine cables and cables for special purposes.
Note. - The test methods and relevant requirements are specified in Part 1.
Maximum permissible operating temperatures
The temperatures given in the table below are applicable to resin oil impregnation and non-draining impregnation and are intended as a guide, based on values widely used, for carrying out the tests in Part 1.
Where other maximum permissible continuous operating temperatures are adopted, the related test temperatures should be adjusted accordingly.
Notes 1. - The temperatures given in this table are only for cables laid either direct in the ground in a substantially horizontal position (unless the impregnation is of the non-draining type), or in thermal conditions equivalent to direct burial.
2. - If cables directly buried in the ground are operating under continuous load (100% load factor) at the maximum permissible conductor temperature given in the above table, the original thermal resistivity of the soil surrounding.the cable may, in the course of time, increase as a result of drying-out processes. Consequently the conductor temperature may exceed the maximum permissible value by a considerable amount. If such operating conditions can be anticipated, appropriate precautions should be taken.
Maximum permissible conductor temperatures in short-circuit conditions
|Organization:||International Electrotechnical Commission|
|Document Number:||iec 60055-2|
|Most Recent Revision:||YES|
|Document #||Change Type||Update Date||Revision||Status|
|IEC 60055-2||Change Type: A2||Revision: 1.0||Status: ACTV|
|IEC 60055-2||Change Type: A1||Revision: 1.0||Status: ACTV|
|IEC 60055-2||Change Type:||Revision: 1.0||Status: ACTV|