Does the cable size in mm2 corresponds to the area of cross section of coppers only n

[dineshdeshmuk]

Does the single core cable size in mm2 corresponds to the area of cross section of copper conductors only (not the insulation) ?


Does the 3 core cable size in mm2 corresponds to the area of cross section of all the 3 core copper conductors only (not the insulation) ?

THANXx

 

[ark5230]

Yes area of crosssection of the conductor not including the insulation.

 

[dineshdeshmuk]

and for 3 core or more than 3 cores, area of cross section of all the conductors of 3 wires (R-Y-B for 3 core cables) ?

how to measure it ? If there's no marking or printing regarding the area of cross section of the cable then how to measure the area of cross section of the cable ?

thanks a lot though

 

[Pjdd]

There are three ways to find out the cross-sectional area. One is to measure the resistance of a known length of wire and then look up the size from a standard wire gauge chart. This is practicable only for very long or very thin wires.

The second method is to use a wire gauge tool. This has a number of holes or slots of different sizes. Find one hole/slot that matches the wire. Then look up the size as above.

The third method is to measure the diameter of a wire with a tool such as a pair of slide callipers and then calculate the cross-sectional area from the formula of a circle.

When using these methods, particularly the last two, to find out the cross-sectional area of a multi-strand wire, first find out the cross-sectional area of one strand and then multiply that with the number of strands in each cable.

 

[Raza]

The given dimension is always of the Conductor and is not the Insulation included. If the total thickness is specified then it means the inclusion of insulation. Using a Micrometer and calculating the circular area is most safe way but for the BARE conductor wires and not the enamelled ones. Using Wire Gauge is easy but (at least me) do not rely on.

 

[dineshdeshmuk]

how many strands are there in a 3.5 core cable ?

thanks

 

[ark5230]

Please check the attached table.

 

[Gimlix]

When there isn't a mark with the cross section, I usully follow the wires until where they are conected somewhere with an O-Ring terminal. In this kind of terminals (even with FastOn types) there is always the cross section marked.

 

[Raza]

how many strands are there in a 3.5 core cable ?

There is no hard and fast rule on this number of strands. It depends upon the manufacturers. but some times the heavy current carrying wires have thicker strands (in flexible cable). Every manufacturer gives always their own specifications.