Power Cables, Electrical Cables, Extra High Voltage Cables, Mining Cables, Wire & Cables Manufacturers

The current ratings given are based on normal condition of installation described below:

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).

Maximum Conductor Temperature

700 for GP PVC Insulation & 850 C for HR Insulation

Thermal Resistivity of soil

1500 C cm/w

Thermal Resistivity of PVC

6500 C cm/w

Ground Temperature

300 C

Ambient air Temperature

400 C

Depth of Laying (for cable laid direct in the ground)

75 cms

Short Circuit Rating in K. amp for One Second duration

Area of Conductor	Aluminum Conductor		Copper Conductor
Sq. mm	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.
However for installations conditions other than above current rating factors incorporated in IS 3961 Part-Il may please be applied.

The following points should be taken into consideration before selecting any particular size & type of cable:

HP	KW	Single Phase Amp	Three Phase Amp	Recommended Cable Size Sq mm.
0.5	0.37	3.7	1.0	1.5	Copper
0.75	0.55	5.0	1.3	1.5	Copper
1.0	0.75	6.5	1.9	1.5	Copper
1.5	1.10	11.5	2.6	1.5	Copper
2.0	1.50	---	3.7	1.5	Copper
3.0	2.20	---	4.8	1.5	Copper
5.0	3.70	---	7.8	1.5	Copper
7.5	5.50	---	11.2	1.5	Copper
10.0	7.50	---	15.5	2.5	Copper
12.5	9.30	---	19.0	2.5	Copper
15.0	11.00	---	22.0	6	Aluminium
20.0	15.00	---	29.0	10	Aluminium
25.0	18.50	---	35.0	16	Aluminium
30.0	22.00	---	40.0	16	Aluminium
35.0	26.00	---	47.0	25	Aluminium
40.0	30.00	---	53.0	25	Aluminium
50.0	37.00	---	65.0	35	Aluminium
60.0	45.00	---	80.0	50	Aluminium
75.0	55.00	---	94.0	70	Aluminium
100.0	75.00	---	127.0	95	Aluminium
125.0	90.00	---	152.0	150	Aluminium

1 The system of power & voltage source where the cable are being used.
2 Conditions of installation at site.
3 Current carrying capacity of cable.
4 Voltage drop of the cable.
5 Short circuit capacity of cable.
6 Availability of the selected size of cable.
Formula for calculating the Short Circuit for other durations
It = Where......
I1 = Short Circuit Current for one second.
It = Short Circuit fort t seconds.
t = Duration in second.
Maximum Conductor temperature during short circuit is 160° C for PVC and HR PVC Cables.

Bending Radius

Recommended Pulling Force

The current ratings given are based on normal condition of installation described below:

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Currrent Rating

The current ratings given are based on normal condition of installation described below:

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