Sage-Tips

Is a cable size by it cross-sectional area?

Cross section is an area. Diameter is a linear measure. Commercially available wire (cable) size as cross sectional area: 0.75 mm2, 1.5 mm2, 2.5 mm2, 4 mm2, 6 mm2, 10 mm2, 16 mm2.

Why the cable wires have a greater area of cross-section?

Wider wires have a greater cross-sectional area. Water will flow through a wider pipe at a higher rate than it will flow through a narrow pipe. In the same manner, the wider the wire, the less resistance that there will be to the flow of electric charge.

What is the cross-sectional area of a cable?

Then we define the cross sectional area simply as the square of the wire’s diameter in mils and call that our area in units of “circular mils.” This makes number handling ever so much easier.

What determines electrical cable size?

Since the calculated value (30 Amp) at 35°C (95°F) is less than that of current carrying capacity of (7/1.04) cable which is 31A, therefore this size of cable (7/1.04) is also suitable with respect to temperature. Here the actual Voltage drop (7.35V) is greater than that of maximum allowable voltage drop of 5.75V.

What are the cable sizes?

Cable Size Ratings in Amps

Cable size	Rating in Amps
2.5mm	27
4mm	37
6mm	47
10mm	65

How does the cross-sectional area of a wire affect its resistance?

Resistance is inversely proportional to cross-sectional-area. The bigger the cross sectional area of the wire the greater the number of electrons that experience the ‘electric slope’ from the potenetial difference.

Which wire has the greatest cross-sectional area?

resistance wires
a. The highest resistance wires have the greatest cross-sectional areas.

When a conductor has a smaller cross-sectional area?

11.3 Conductor Ampacity The smaller the cross-sectional area of any given wire, the greater the resistance for any given length, all other factors being equal. A wire with greater resistance will dissipate a greater amount of heat energy for any given amount of current, the power being equal to P=I2R.

How does length and cross-sectional area affect resistance?

its length – the longer the wire, the greater its resistance. its cross-sectional area A – the greater the area, the less its resistance. the resistivity of the material r – the greater the resistivity, the greater its resistance.

What is cable sizing and selection?

Cable selection is about choosing the appropriate type of conductor and selecting a suitable size/cross-section area/ diameter of the conductor according to the application.