What is the maximum current carrying capacity of a 25 sq mm aluminium cable?

Answer 1

simple thumb rule for bus bar capacity of copper is width of bus bar multiply by thickness of bus bar is the current carrying capacity of bus bar

Answer

The 'simple rule of thumb', above, is quite meaningless without the units of measurement being specified. Are they in inches, millimetres, centimetres, mils, ? What?

Answer 2

If not mistaken, 2.5 Sq mm wire is the choice for loads up to 16 Amps.

Although bear in mind that it also depends on voltage and length of wire.

So much for the recommendations.

The fact is that if given a power source of immense power, one can pump through power, until the wire melts away.

This is what happens in a fuse. A tiny short bit of wire in a fire proof housing. When the load is too high, the fuse melts and you are without power.

Depending on the length of the wire, it should not be a problem to load it with 25 amps, even 50 amps if it is really short.

I don't know how many amps it would take to actually melt the wire, but please dont do wild experiments on this matter.

regards.

Answer 3

25mm x 3mm = 75 sq. mm 75 sq mm = 116250.2325 sq mils 116250.2325 sq mils = 148009.7960 circular mils 148009.7960 circular mils = 148 kcmil 133.1 kcmil = 2/0 AWG wire (NEC Chapter 9, Table 8) 167.8 kcmil =3/0 AWG wire (NEC Chapter 9, Table 8) As you can see, 148kcmil is somewhere between 2/0 and 3/0. Using NEC Table 310.16, we can APPROXIMATE the ampacity of the bus bar to be that of 2/0 copper wire in the 90 degree column. My guess is that the bus bar can actually handle much more than this because: A) It has no insulation, and therefore even the 90 degree temperature rating is a limiting factor. B) According to our math, the bus bar is 148kcmil, which is about halfway between 2/0 and 3/0. The largest rating in the NEC that can be used is the 2/0 rating. This being said, the bus bar can handle at least 195 amps. There is likely a more accurate method of calculating this, but it's my best shot. Typically we don't calculate ampacities of bus bars. The manufacturer does.

Answer 4

cable current carrying capacity is depends up on the area where you will be laidsuch as under ground,cable trays, or on ground ,
normally 25 sq.mm al cable can carry 50 to 65 amps


suneel thandra

Answer 5

0.8A/sqmm for copper and 1.2A/sqmm for Aluminium........... I think, it should be vice versa..............

Answer 6

A 95 sq mm cable is equal to a 3/0 AWG cable.

A 3/0 copper conductor with an insulation factor of 75 or 90 degrees C is rated at 200 and 210 amps respectively.

Answer 7

in Still Air the rating is1060A AC2

Answer 8

Normally 1amp to 2.5amp

Answer 9

35 mm2 copper can take 100 amps.

Answer 10

110A