It usually means that the cable is made from 14 strands of wire with each wire having a diameter of 0.3 mm. This means it has an overall cross sectional area of 1 mm²: -
$$14\times \dfrac{\pi\cdot 0.3^2}{4} = 0.9896\text{ sq mm}$$
Example from Farnell: -
It usually means that the cable is made from 14 strands of wire with each wire having a diameter of 0.3 mm. This means it has an overall cross sectional area of 1 mm²: -
$$14\times \dfrac{\pi\cdot 0.3^2}{4} = 0.9896\text{ sq mm}$$
It usually means that the cable is made from 14 strands of wire with each wire having a diameter of 0.3 mm. This means it has an overall cross sectional area of 1 mm²: -
$$14\times \dfrac{\pi\cdot 0.3^2}{4} = 0.9896\text{ sq mm}$$
Example from Farnell: -
