The ampacity of conductor is defined as the measure of its ability to carry electric current.
The ampacity depends on different factors including the type of material, cross-sectional area, and type of area where the installation of conductors is being carried out.
All types of metals conduct electric current, however conduction properties of metals vary. Aluminium and copper are two popular conductors that are invariably used in field of electrical engineering.
Aluminum is generally used where consideration of weight is important (e.g long-distance overhead power lines).