The appearance is much like the foil in a gum wrapper. Braids can be combined with foil for maximum performanceįoil Shields are usually constructed of an aluminum and mylar composite tape.Key factors to consider when using metallic braid shields include: The braid can be "pig tailed" for termination. The normal drain wire in electronic applications is tinned copper to prevent the drain from corrosion. An uninsulated ground wire can be included, in contact with the braid for easy termination. To terminate a braid shield it is necessary to unbraid the braiding material and hand terminate to ground. Braid shields are specified on all mil spec applications. Often a braid shield is supplemented by a foil shield to increase shield coverage and still provide the benefits of a braid shield and maximum shield coverage. Braids provide mechanical strength as well as flexibility and flex life and are most effective at low frequencies. The greater the braid coverage, the slower it is to produce, the more it costs and the less it will flex. 75-85% coverage is standard, 100% coverage is technically unobtainable. They are woven over a conductor or conductors in the same manner as a textile braid.īraid shields effectiveness is proportional to the amount of braid coverage over the wire. Steel and other metals can be used for physical protection. Metallic Braid Shields are usually formed from bare, tinned or silver plated copper strands. We’ll explore the most common shielding types and their pros and cons. But there are additional options available that may fit your application better. Metallic braids and foil shields are options for wire shielding that most people are likely familiar with. In situations with long signal runs or complex circuits, shielding becomes a crucial part of reducing interference and maintaining signal integrity.
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