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Medium Voltage Cables > Installation |
| Installation |
| The following are the important points
to be taken care of during cable Installation, at site :
1- General : The cable should be paid off from
the top of the Cable drum, held in the normal position. Sufficient
care should be taken to prevent twists; acute bends etc. while laying
the Cable
|
2. Minimum Bending Radius :
| |
Single Core |
Multi Core |
| Cables from 3.3 kV to 11kV |
15 D |
15 D |
| Cables of 22 & 33 kV Grade
|
20 D |
15 D |
| Where D is the overall die of
the Cable. |
|
3. Maximum Pulling Tension during Installation :
| Cables having Aluminium Conductor |
30 N/Sq. mm. Max |
| Cables having Copper Conductor
|
50 N/Sq mm. Max |
|
4. Cable Support Spacing : The disposition of
cable support and its spacing should be such, as to prevent undue
strain or damage to the cable
5. Prevention of Moisture Ingress : Care should
be exercised at site during installation to prevent damage to cable
coverings and end which may cause the ingress of moisture
6. Tests after Installations : Voltage withstand
and Insulation Resistance Tests should be conducted on cables after
laying or after joining and terminations. The test method, voltage
and duration should be as stipulated in IS: 12 55-1983 for various
voltage grades of the cables.
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