How can CALCULAT the current carrying capacity of aluminum
and cOpper cables respective of that Sq.mm ? with
formulas ?
Answers were Sorted based on User's Feedback
Answer / manoranjan
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 ? | 200 Yes | 84 No |
Answer / satish
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 70×1.5=105 A
&
16 sq mm Cu cable can take 16×4=64 A
Is This Answer Correct ? | 186 Yes | 90 No |
Answer / gaurav
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 ? | 77 Yes | 46 No |
Answer / martin
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 ? | 25 Yes | 13 No |
Answer / devi prasad
for cu current in z sq mm = z× 4Amp
for ALU =Z×2 Amp
Is This Answer Correct ? | 5 Yes | 5 No |
Answer / aloke kumar pati
My experience with electricity does not agree with the above answers. For years I have used a 1.5 sq. mm. Al service line for a load of at least 2 KW (ignoring the motor- based appliances whose initial current is much higher). This load required at least 9 amps. which came through the 1.5 sq. mm. Service line! Thus the 'thumb-rule' of multiplying sq. mm. by 1.5 to get the amperage in Aluminium cable is belied in the above instance given by me.
Is This Answer Correct ? | 0 Yes | 2 No |
Answer / sbb
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 ? | 30 Yes | 58 No |
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