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The roll of drain wire in the cable is to complete the circuit from the shield to the ground. This allows all the excess electrical noise to be routed to the ground.

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9y ago
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12y ago

It is a metallic conductor frequently used in contact with foil-type signal-cable shielding to provide a low-resistance ground return at any point along the shield.

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Q: What is drain wire and what is it used for?
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