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Question:

We say that the size of power cable is 4 core, 150 sq.mm. What would be the diameter of this cable ???

How can we make out the physical size of a power cable if the cable is said to be 4 core, 150 sq.mm ??? How will we measure the diameter of this cable ???? please suggest......

Answer:

If the size of the cable is 4 core, 150 sq.mm; = the cross sectional area of each core is 150 sq.mm. The diameter of each core is gotten from the formula C = ╥d. From this $ substituting values for ╥ and C; We find that d = 150 / 3.142. = d = 47.74mm :. for 4 cores, diameter of cable = 47.74 * 4 = 190.96mm However, note that this is only mathematical. On the field, the dimension of a cable is usually specified based on the number of cores it has, and the cross sectional area of one of the cores as the cores are all of the same size.
A 4core (electrical) cable of that strength is usually built up from quarter circle shaped sectional wires. (Think of a pizza cut into four even pieces.) So, calculate the outside diameter from this point and add 4 times the insulator thickness. Example: 400V 4core cable has very likely 1mm insulator thickness. 150mm? * 4 cores is 600mm? total. By A=PI*d'*d'/4, d' being the diameter without insulator, would be d'=2*sqrt(A/PI)=600mm?/3.1415...=2*sqrt(...? Now, as said above, add the 4 insulator layers, and then you would be at approx. 31.7mm outside diameter.

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