| 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 of 1100 V Grade |
15 D |
12 D |
| Cables from 3.3 kV to 11 kV |
15 D |
15 D |
| Cable 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 jointing and terminations. The test method, voltage
and duration should be as stipulated in IS: 1255-1983, for various
voltage grades of the cables.
|
