Aluminium & Copper Current Carrying Capacity Calculation Chart in Sqmm

Aluminium and Copper Current Carrying Capacity Calculation Chart in Sqmm:

Aluminium and copper are the most available material in the earth, but the copper conductor carries 40% extra current than the aluminium conductor. But the cost to loss point of view, i.e the cost of 3 core 35sqmm aluminium cable has Rs 1.6per sq. meter and copper conductor has Rs 3.0 per sqmm, hence aluminium cables are much cheaper.,However, in this article, we are going to see how to get cable capacity using Aluminium and Copper Current Carrying Capacity Calculation chart.

Note: Here sqmm indicate the diameter of the cable.

Also, the current-carrying capacity of the cables are depending on the following factors such as

  1. Ambient temperature,
  2. Number of core,
  3. Voltage level,
  4. Method of cable laying i.e if you lay the cable in underground, you can load the cable by extra 5% than the cable laying at standard trays.
  5. Type of insulation.
  6. Conductor class.
  7. Manufacturer Standards.
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Copper Current Capacity capacity chart:

Below chart recommends single core copper cable as for class 5 conductors (flexible), 2 core and 3 core cable as class 2 conductor. Refer to the below-mentioned cable,

Class 5 and Class 2 conductor

Note that, the first column indicates the size of the cable, according to that, you can get the current-carrying capacity of the cable with respect to its size in sqmm.

 

Copper cable Current Carrying Capacity (XLPE insulated)
Cable Size  in (Sq. mm) Single Core Two Core Three/Four Core
1 17 13.5 9
1.5 22 17.5 15.5
2.5 30 24 21
4 40 32 28
6 51 41 36
10 69 57 50
16 91 76 68
25 119 101 89
35 146 125 110
50 175 151 134
70 221 192 171
95 265 231 201
120 305 269 239
150 334 300 261
185 384 341 296
240 459 400 346
300 532 458 394

 

 

Aluminium Current-Carrying Calculation chart:

Aluminium cable Current Carrying Capacity (XLPE insulated)
Cable Size  in (Sq. mm) Single Core Two Core Three/Four Core
4 16 13 11
6 20 16 14
10 25 22 19
16 35 31 28
25 43 41 36
35 65 59 52
50 80 71 63
70 91 80 71
95 120 115 100
120 153 133 118
150 188 161 140
185 230 203 176
240 270 254 220
300 340 314 270
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How to calculate aluminium bus bar current carrying Capacity?

Aluminium current-carrying is equal to 0.8 times the total volume of the aluminium (lenth*breath*thickness). Let’s have a simple example of 4 sqmm bus bar. Apply our equation,

Current carry capacity of 35 sqmm bar= 0.8* 35 = 28 Amps.

How to calculate Copper bus bar current carrying Capacity?

Copper current-carrying is equal to 1.2 times the total volume of the aluminium (lenth*breath*thickness). Lets us have a simple example of 35 sqmm bus bar. Apply our equation,

Current carry capacity of 35sqmm bar = 1.2* 4 = 42 Amps.

 

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