Benefits of tinned wire. Tin is a useful plating for copper because it not only helps to boost copper’s properties, it also helps the wire to last much longer than it would normally. In fact, a 12 gauge tin coated copper wire can last up to ten times longer than a similar 12 gauge bare copper wire.opper has a great conductivity (second only to silver,) a durable tensile strength and is easy to machine into wire and other specialty wire and cables. For these reasons, copper finds itself being used to create many alloys that are used for electrical work or for machining such as brass, nickel, silver or bronze.