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The current ratings given in Tables 2 to 9 are based on normal condition of installation described below:

 
1 Maximum Conductor Temperature 700 for GP PVC Insulation & 850 C for HR Insulation
2 Thermal Resistivity of soil 1500 C cm/w
3 Thermal Resistivity of PVC 6500 C cm/w
4 Ground Temperature 300 C
5 Ambient air Temperature 400 C
6 Depth of Laying (for cable laid direct in the ground) 75 cms
 

Cables shall only be operated at their full rating if the minimum current at which circuit protection is designed to operate does not exceed 1.5 times (in the case of cables in air or in ducts) or 1.3 times (in the case of cables laid direct in the ground) the values tabulated, in table 2 to 9

 
Short Circuit Rating in K. amp for One Second duration
 
Area of Conductor
Sq. mm
Aluminum Conductor Copper Conductor
GPPVC HRPVC GPPVC HRPVC
1.5 0.1126 0.097 0.169 0.153
2.5 0.1878 0.162 0.283 0.255
4 0.3004 0.259 0.452 0.406
6 0.4507 0.389 0.67 0.612
10 0.7512 0.648 1.132 1.020
16 1.200 1.087 1.810 1.632
25 1.870 1.620 2.830 2.550
35 2.620 2.270 3.960 3.570
50 3.750 3.243 5.660 5.100
70 5.250 4.540 7.920 7.140
95 7.13 6.150 10.750 9.690
120 9.00 7.784 13.580 13.340
150 11.260 9.730 16.980 15.300
185 13.890 12.000 20.940 18.870
240 18.020 15.560 17.160 24.480
300 22.530 19.460 33.960 30.600
400 30.040 25.940 45.280 40.800
500 37.560 32.43 56.600 51.000
630 47.320 40.860 71.310 64.250
Note.
For cables in air, no reduction in current rating is necessary provided that
 
The horizontal clearance between circuits is:
 

(a) not less than six times the overall diameter of an individual cable, and
(b) not less than the overall width of an individual circuit, except that the horizontal clearance need not in any case exceed 150 mm

The vertical clearance between circuits is not less than 150mm

If the number of circuits exceeds, they are installed in a horizontal plane.

 
 
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