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Copper wire has several important properties that make it a “natural” for electrical wiring. More than any other non-precious metal, it is the best conductor of electricity, packing more power into a given diameter of wire than any substitute material. Copper wire is also easier to bend. With copper wire, connections are easy and sure. And, because it has a high melting point, it can take surprisingly heavy overloads or current surges without damage or danger.
Insulated copper wire has the characteristics of "single material, soft material and excellent electrical conductivity". Bare copper wire is used for simple electrical connections or visible indoor grounding wires, and is more commonly used in laboratories. Generally speaking, bare copper wire is not painted.
So how can you tell the quality of bare copper wire?
Insulated copper wire is copper wire drawn from a pure copper rod. Bare copper wire does not have an insulating layer. Bare copper wire has the characteristics of "single material, soft raw material and excellent electrical conductivity". Bare copper wire is used for simple indoor electrical connections or visible grounding wire, more commonly used in the laboratory. In general, not glazed bare copper wire can not be replaced by aluminum wire, mainly for corrosion and safety considerations. Copper wire is generally made of hot-rolled copper strips by annealing, and can be used for braided nets, cables, copper brush filters, etc.