We should have some understanding of BV cable. Since BV and BVR cables are the most common types used in homes, today we'll take a detailed look at BV cable. Wires and cables come in a variety of specifications, and BV cable is no exception. So, which BV cable model is best suited for a 55kW variable-frequency motor? We'll explain this below.
1. Concept
BV cable, also known as plastic copper wire, is also known as copper-core PVC insulated cloth wire. The B designates the wire type, and the V indicates the insulation is PVC. It is suitable for use in power equipment, household appliances, instruments, and telecommunications equipment with AC voltages of 450/750V and below.
2. Applications
① General-purpose, single-core, rigid-conductor, unsheathed wire, suitable for use in power equipment, household appliances, instruments, and telecommunications equipment with AC voltages of 450/750V and below.
② Ordinary insulated wire, also known as household wiring, is the most commonly used type of wire. For a new 100-square-meter home, for example, 200 meters of 4-square-meter copper-core BV wire, 400 meters of 2.5-meter wire, 300 meters of 1.5-meter wire, and 100 meters of 1.5-meter copper-core BV two-color wire are required. This applies to homes without suspended ceilings. If a suspended ceiling is required, 1.5-meter wire will require more. BV wire diameters are available in several sizes: 0.2, 0.3, 0.4, 0.5, 300, and 400 square meters.
3. Common Models
Common BV wire sizes include: 0.75 square meters, 1 square meter, 1.5 square meters, 2.5 square meters, 4 square meters, 6 square meters, 10 square meters, 16 square meters, 25 square meters, 35 square meters, 50 square meters, 70 square meters, 95 square meters, 120 square meters, 150 square meters, 185 square meters, and 240 square meters.
What size BV wire is needed for a 5kW variable frequency motor?
According to the formula, phosphorus = uranium iodine 1.732. A 55kW motor only requires 16 square wires.
The 16 square wires are based on the formula, but in reality, we must consider the environment in which the wires will be used and the wire capacity. A larger wire diameter is best. If the wire diameter is too thin, the motor will overheat after prolonged use. Factories experience high temperatures in the summer. Furthermore, there are other equipment in the workshop that also generates heat during operation. Variable frequency motors are used in injection molding machines, which are also temperature-controlled. Furthermore, wiring runs in wiring troughs, with many lines connected together. I believe using 25 square wires is safer.
If the manufacturer is controlling costs, they can use 16 square wires. Some motors may not be fully loaded for extended periods, so this should be fine. Regularly inspecting the wiring is paramount. Safe use of electricity is paramount.
The above mentioned calculations can determine the required wire size, but these are theoretical figures and should only be used as a guide. In practice, many other factors must be considered before deciding the appropriate wire size. So this tells us that no matter where we choose to use the wires, we must consider the actual situation and not make blind choices.
