Copper Braid Sizing: Why Width × Thickness Is Not Conductor Area

Separate copper content from the space it occupies

A flat braid consists of many interlaced wires, with spaces between them. Its overall width and thickness describe the space occupied by that woven structure, including voids. They are useful for clearance and mounting, but their product is not the same as the combined metal area of the wires. Harger lists nominal width and thickness separately from conductor gauge and circular-mil area. When comparing quotations, require conductor cross-section as its own field rather than allowing an envelope measurement to stand in for it.

Ask how the nominal conductor area is established

For equal round strands, the sum of strand areas is calculated from the number of strands multiplied by the area of one strand. The underlying geometry is N × π × d² / 4, where d is strand diameter. Bridgold's manufacturer guidance illustrates this approach for flat braid. Use it to understand a construction description, not to certify a finished product from a photograph. Ask for the nominal conductor area, strand construction, material, and an appropriate resistance specification when electrical equivalence matters.

Distinguish continuous current, fault duty, and bonding

A braid used as a power connection, protective bonding link, or shielding connection does not face an identical selection problem. State the intended function before asking for a size. Continuous current requires an appropriate thermal basis; fault duty adds current magnitude and duration; a moving connection adds mechanical requirements. Terminal design and installed routing also belong in the review. Request application-specific engineering confirmation rather than deriving an ampere rating from width, thickness, or another supplier's similarly sized product.

Specify the terminals and movement allowance

Provide the distance between connection points, required hole size and spacing, terminal orientation, maximum available width and thickness, and expected motion. Define whether a length refers to overall length, flexible length, or hole centers so quotations can be compared consistently. Include conductor finish and any insulation requirement. For DUCHUANG copper braid inquiries, request a drawing showing both electrical cross-section and mechanical dimensions. Review the finished assembly against the actual mounting surfaces, fastening arrangement, and movement before accepting a sample for repeated production.

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