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PVC Insulated Power/Control Cables:
The current carrying capacity or loading of cables & conductors is
limited by the thermal,electrical and other associated losses provided
by the conductor, insulation ,protective covering & surroundings.
Standard conditions of installations:
|
(1). Maximum conductor temperature |
:
|
70° C |
(2). Thermal Resistivity of soil
|
:
|
15° C cm/watt
|
(3). Thermal Resistivity of PVC
|
:
|
650° C cm/watt |
(4). Ambient air temperature
|
:
|
40° C |
(5). Ground temperature
|
:
|
30° C |
(6). Depth of laying
(For cables laid directly in ground)
|
:
|
75 CM
|
For site conditions other then the above conditions of
installation,the
appropriate rating factors given must be used.
Rating Factors for different installation conditions :
(A) For Variations in Ambient Air Temperatures
:
Ambient Air Temperature (°C)
|
25 |
30 |
35 |
40 |
45 |
50 |
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