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Question
How can CALCULAT the current carrying capacity of aluminum 
and cOpper cables respective of that Sq.mm  ? with 
formulas ?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
Use of formula is always a cumbersome exercise.
In pactical 1.5A/sqmm for al,cable & 2.5A/sq.mm is
considered in practical way. means a 50sqmm Al cable will
carry at least 75A and same size copper cable will carry
125A.
 
Is This Answer Correct ?    34 Yes 17 No
Manoranjan
 
Answer
# 2
1.0 To 1.5A/sqmm for al,cable & 2.0 TO 2.5 A/sq.mm is
considered in practical way. means a 50sqmm Al cable will
carry at least 75A and same size copper cable will carry
125A.
 
Is This Answer Correct ?    17 Yes 9 No
Gaurav
 
 
 
Answer
# 3
Thumb rule
For Al Conductor Cable Multiply Sq mm size by 1.5.
&
For Cu cable Multiply sq mm size by 4.
e.g.
70 sq mm Al Cable can take 701.5=105 A
&
16 sq mm Cu cable can take 164=64 A
 
Is This Answer Correct ?    8 Yes 4 No
Satish
 
Answer
# 4
Check the CCC by any supplier's brochure.
Derate the CCC on the following parameters
Maximum Ambient temp.
Cable buried UG / on air
Clearance between adjuscent cables.
185 mm2 4 c Alu XLPE cable's ccc = 200 Amps in the Gulf.
 
Is This Answer Correct ?    5 Yes 3 No
Martin
 
Answer
# 5
As we know that Resistance of conductor is calculated by

R= row*l/a
where row=specific resistance of the conductor i.e
aluminium and copper(depends of material)
l=length of the conductor
a=area of cross-section of the conductor.

And as we know that the conductivity of the aluminium
conductor is <=1 (depends upon the distance of the cable
laid avg.0.8-1) and conductivity of copper is <=1.5
(depends on cable laid. avg. 1.2-1.5).

for ex.take cable length of 180 sq.mm Al. cable

if we want to know the current carryng capacity is
180*o.9=168 A approx.
 
Is This Answer Correct ?    20 Yes 27 No
Sbb
 
Answer
# 6
Generall we are consider for Cu 1.5A 1.6 A / SQ MM
and AL 0.8A/ sQ MM
 
Is This Answer Correct ?    23 Yes 31 No
Bala
 
Answer
# 7
Measure the load connected in that cable 
Is This Answer Correct ?    47 Yes 64 No
Manoj
 
Answer
# 8
read the datasheet of cable factory, don't play smart with
formulas, u stupid dumbass
 
Is This Answer Correct ?    28 Yes 58 No
Amitamit Makanbacem
 

 
 
 
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