Bus Bar- Types- QQ-W-343-D, Types-ASTM-B-33

Tin provides a protective surface over the copper conductor.

The tin coating helps separate the underlying copper from the surrounding environment and provides a surface suited to electrical connection and fabrication applications. ASTM B33 includes requirements covering the continuity and adherence of the tin coating as well as electrical and mechanical characteristics of the finished wire.

Soft-drawn annealed copper has been heat-treated to increase its flexibility and workability.

Annealing changes the mechanical properties of the copper after drawing, making it easier to form, bend, wind, or incorporate into electrical assemblies than harder-drawn copper conductors. This characteristic can be particularly useful in component leads, coil winding, and point-to-point connections where the conductor must be shaped during fabrication.

The required wire size should be based on the electrical and mechanical requirements of the application.

Current requirements, allowable resistance, connection method, physical dimensions, and equipment design can all influence conductor selection. This product family is available in several AWG sizes, each with different nominal diameter, circular area, and weight, so the full design specification should be reviewed before ordering.

No. ASTM B33 addresses several characteristics of tin-coated annealed copper wire.

The specification includes requirements involving tensile strength, elongation, electrical resistivity, wire dimensions, continuity of the tin coating, and coating adherence. This makes ASTM B33 more than simply a description of the surface finish and helps provide consistent performance requirements for tin-coated copper conductors.

Provide the required AWG size, quantity or footage, applicable specification, and intended application.

It is also useful to include dimensional requirements, electrical requirements, packaging preferences, and any drawing or project specification that must be followed. If a project references an older specification such as QQ-W-343, including the exact revision or drawing requirement can help ensure the requested material is matched correctly.