BV is a single-core copper wire, which is hard and inconvenient for construction, but has high strength. BVR is a multi-core copper wire, which is soft and convenient for construction, but has low strength. BV single-core copper wire – generally for fixed places, BVR wire is a copper-core PVC insulated flexible wire, which is used in the occasions where the fixed wiring requires softness, and is generally used in occasions where there is slight movement. In addition, the current carrying capacity of the BVR multi-strand line is larger than that of the single-strand line, and the price is also higher. Usually, BVR can be used for the cables inside the cabinet, without such a large strength, which is convenient for wiring