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Current Rating For Copper & Aluminum Conductors Vulcanized Rubber, PVC or Polythene Insulated Cables (Single Twin, Three & Four Core)

Item

Standard Copper Conductor

Continuous Current Rating (Subject to Voltage Drop) (Amps)

Standard Aluminium Conductor

Area

(Sq. In)

Strand 

(Inch)

In conduit troughing or casing (2 single Core Cables) 

Bunched in Free Air or Open Trench

One 
Twin 
Core 
DC or AC

One 3 or 4 Core Cable Balanced 3 Phases

Area

(Sq. mm)

 Strand

(mm)

2 Single Core Cables

3 or 4 Core Cables
1 0.0015 1/004 5 5 5 5 5 - -
2 0.002 3/.029 10 10 10/9 10 8/7 1.5 1/1.40
3 0.003 3/.036 15 15 13/12 15 10/11 2.5 1/1.80
4 0.0045 7/029 20 20 15 20 15 - -
5 - - 20 20 17 20 14 4 1/2.80
6 - - 27 27 24 27 19 6 1/2.80
7 0.007 7/.052 28 28 25 28 20 - -
8 - - 34 34 31 34 24 10 1/3.55
9 0.01 7.044 36 36 32 36 25 - -
10 0.0145 7/052 43 43 39/38 43 30 16 4/1.70
11 0.225 7/.64 53 53 48 53 37 - -
12 - - 59 59 54 59 42 25 7/2.24
13 .03 19/044 62 62 56 62 43 - -
14 - - 69 69 62 69 48 35 7/2.50
15 0.04 19/052 74 74 67 74 52 - -
16 - - - 91 82 91 62 50 7/3.00
17 0.06 19/064 - 97 88 97 68 - -
18 0.075 19/0.072 - 123 107 115 78 - -
19 - - - 134 118 118 82 70 19/2.24
20 - - - 153 138 135 94 95 19/2.50
21 0.1 19/083 - 160 140 140 98 - -
22 0.12 37/064 - 177 158 158 109 - -
23 - - - 184 170 162 114 120 37/2.24
24 0.15 37/083 - 205 185 180 126 - -
25 - - - 210 185 181 157 150 37/2.24
26 - - - 246 216 209 146 185 37/2.4
27 0.2 37.083 - 250 220 218 153 - -
28 - - - 290 248 240 169 225 377/2.80
29 25 37/093 - 293 260 252 178 - -
30 0.3 37/093 - 335 295 284 199 - -
31 - - - 354 302 389 202 300 61/2.50
32 - - - 425 360 342 240 - -
33 - - - 453 372 - - 400 31/3.00
34 5 61/0.93 - 480 410 - - - -
35 - - - 480 411 - - 500 91/2.65
36 - - - 565 484 - - 625 91/2.65
37 75 91/103 - 610 520 - - - -
38 1.0 127/103 - 740 630 - - - -

** Rating Ambient Temperature 30oC

For Ambient Temperature other than 30oC
Rating should be multiplied by the following Rating Factors 25oC 35oC   40oC   45oC
                                                                      Rating Factor                        1.13    96        69       47
In the above table current ratings (subject to voltage drop) have been given for Copper conductor cables (in the new metric sizes as per I.S. 1753-1961) from this chart, the requires size of Aluminium conductor can be established if either the Current Rating or the size of the Copper Conductor is known.

 
© Copy Right 2004 Shyam Net, Cochin-16, Kerala,  India. All rights reserved. Revised: August, 2005
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