Single-core wire has only one conductor within a single insulating layer. When current flows through a single-core cable core, magnetic lines of force intersect the aluminum sheath or metal shield, inducing a voltage across the wire. Common uses for single-core wire include home lighting, electrical outlets, and air conditioners. Let's take a closer look at the different types of single-core wire and their advantages and disadvantages!
Single-core Wire Classifications
Single-core wires include BV wire, RV wire, and BVV wire. BVR wire is a multi-core wire made of a softer material and consisting of many fine copper wires twisted together.
Single-core Wire Colors:
Common single-core wire colors include: red, yellow, blue, green, black, white, two-tone (yellow and green), and brown.
Advantages of Single-core Wire:
Due to its small cross-sectional area ratio, it is less susceptible to oxidation, is resistant to short-circuit current surges, and has a relatively long service life.
Disadvantages of Single-core Wire:
The conductor is relatively stiff, making it difficult to pull in some places. It is difficult to straighten after bending, and repeated bending can easily damage the wire.
Single-strand copper wire can be used for household wiring, but some electricians require multi-core flexible wire. While there's no real difference in quality, multi-core flexible wire is simply easier to wire than single-core wire.
The above is an introduction to the types of single-core wire and their advantages and disadvantages. For voltages above 35kV, single-core cable is mostly used. The relationship between the core and metal shield can be likened to the relationship between the coil and the iron core in a transformer's primary winding. Compared to multi-core copper wire, single-core copper wire is more convenient for line connections and equipment wiring.
