For home decoration, there are BV hard wire and BVR copper core flexible wire. BV hard wire refers to BV wire and BVV wire, both of which are hard conductor wires. However, in other aspects, such as structure and shape, there are certain differences between the two. So what are BV and BVV hard wires? What are the differences between BV and BVV wires? Today, let's learn about BV and BVV wires.
BV and BVV hard wires
1) BV is a single-core polyvinyl chloride (PVC) insulated wire, also known as plastic copper wire. PVC is what we commonly call plastic. Unsheathed BV wire is primarily used for connecting appliances in homes with voltages of 450/750V or below. Common specifications range from 0.75 square to 16 square. Larger sizes are rarely used, so BV wire larger than 16 square typically needs to be custom-made.
2) BVV copper-core PVC-insulated and PVC-sheathed round wire is constructed from two or more BV wires. Multi-core BVV is a flat wire with both insulation and sheathing, and is primarily used for surface installation. Generally, 2x2.5 is used for main lines and trunk lines, while 2x1.5 is used for branch lines and switch lines for individual appliances. Single-phase air conditioning lines use 2x4 BVV, with a dedicated ground wire.
Similarities between BV and BVV wires
① The insulation material is both PVC, indicated by the letter "V."
② The conductor material is both oxygen-free copper, indicated by the letter "T."
③ Common colors include red, yellow, green, blue, black, and two-tone (yellow-green).
④ Flame-retardant and fire-resistant types are available, namely ZC and N. The former resists spontaneous combustion when exposed to open flames, while the latter offers the advantage of maintaining service life for a period of time even if properly ignited.
Differences between BV and BVV cables
①BV—bare copper wire, often installed in conduits or cable trays; BVV—sheathed wire, often installed in the open.
②BV is a single-core PVC-insulated cable; BVV is a multi-core sheathed cable, consisting of a BV cable inside, and two or more cores then covered in a sheath. Both the insulation and sheath are made of PVC.
③BV cables are simply extruded with insulation, while BVV cables require two layers of sheathing, and these must be free of adhesion. Flexible conductors are typically stranded, while rigid conductors are typically single-stranded. BVV cables have double insulation, while BVV cables have single insulation.
④BVV cables differ in sheathing and unsheathing. The difference between BVV and BV cables can be clearly seen in these two standards: 227IEC01 (BV) and 227IEC10 (BVV). According to the standards, BVV cables have 2-5 cores, consisting of conductor, insulation, cable, inner sheath, and then an outer sheath. BV cable is a single-core wire with only one layer of insulation.
BV rigid cable is the most common choice for home wiring these days, but some people still hesitate between BV rigid cable and BVR flexible cable. Ultimately, the decision depends on your wiring requirements. The above information is intended to serve as a reference for those purchasing home wiring.
