How to distinguish the wire inside the power cord is pure copper wire, copper clad aluminum wire, aluminum wire?

How to distinguish the wire inside the power cord is pure copper wire, copper clad aluminum wire, aluminum wire?

A.See section

Because the thicker wire is covered with copper and aluminum, it is easy to see.So the general copper - clad aluminum is soft wire, there are many small filament multi - strand composition.But just cut the section and look for the whitened (aluminum color) to identify the material.

Two: fire method

Just use a lighter to burn, see the burning phenomenon and the result after burning, copper clad aluminum and copper clad aluminum magnesium wire, when the flame contacts the wire, the conductor will sag straight, not easy to burn, after burning, the conductor color is gray or darker;Because aluminum has a lower melting point than copper.Difference: copper - clad aluminum burned after the conductor with a finger twist will break, more brittle, will break into many joints.If the oxygen-free bare copper wire burned to form a ball beads that is copper wire, copper wire thickness is not the same after burning the result is not the same, filament melting, coarse wire original.

Three: scrape with tools

Tinned copper wire appears yellow after scraping, is copper.Anaerobic bare copper wire after scraping is still the primary color is also copper.And copper - clad aluminum wire and copper - clad aluminum magnesium aluminum appear white snow spots.Or put the silk on the cement floor surface friction can also get the same effect.Copper - clad steel wire can also be identified by this method or by magnet.