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RVB, commonly known as red and black (parallel) wires, is a flat unsheathed flexible wire, which is extruded from a red and a black insulated copper wire in parallel, and its name is derived from this.
Meaning of wire symbols.
Code R means flexible wire (conductor structure).
The code V represents polyvinyl chloride (sheath material).
Code B means parallel (wire shape).
Alias: red and black wire, parallel wire, flat unsheathed wire, red and black flat wire.