Control cables are a common type of cable used to connect electrical equipment. While most control cables we commonly see are KVV cables, what kind of cable is KVVR cable? What is its function? What are the differences between it and KVV? Let's take a brief look.
What does KVVR cable mean?
KVVR stands for copper-core PVC insulated and PVC sheathed control flexible cable. The K stands for control, the two Vs represent PVC insulation and PVC sheath, and the R stands for soft. Because the PVC insulation material is used, the maximum operating temperature of the cable during normal operation is 70°C. This cable consists of five components: conductor, insulation, filler, tape, and sheath.
KVVR Cable Applications and Specifications
KVVR control cables are generally suitable for automatic control, monitoring circuits, and protection circuits in systems operating at 50 Hz AC with a rated voltage of 0.45/0.75 kV (maximum voltage not exceeding 1 kV) and below. They are primarily installed indoors where flexibility is required.
Because this cable is a flexible cable, it is primarily used in unshielded applications requiring flexibility or requiring indoor mobility. However, it cannot withstand strong mechanical forces. Therefore, care must be taken during installation to protect the cable from damage. Cable bending standards must be followed during installation. The bending radius for unarmored cables should be no less than six times the cable's outer diameter; for cables with armor or copper tape shielding, no less than 12 times the cable's outer diameter; and for flexible cables with shielding, no less than six times the cable's outer diameter.
Generally speaking, unless the cable is overloaded, the operating temperature of the cable conductor is generally within the normal operating temperature range. Under normal operating conditions, the maximum operating temperature of the cable conductor does not exceed 70°C. In the event of a short circuit, the maximum operating temperature that the cable conductor can withstand does not exceed 160°C, and this temperature cannot exceed 5 seconds. The cable can have a minimum of 2 cores and a maximum of 61 cores. All are composed of fine copper wires twisted together, but the most common core count is 2-37. The cross-sectional area of the conductors we commonly use is 0.75-6mm².
KVVR and KVV cables are both control cables, so what's the difference?
What are the similarities between KVVR and KVV cables?
1. Rated voltage: Since both are suitable for automatic control circuits with a rated voltage of 450/750V or lower, the rated voltage of both products is the same.
2. Number of cores: The common core count for control cables is at least 2 and at most 61, and the common conductor cross-sectional area is 0.75-6mm². Therefore, both types of control cables have the same core count.
3. Bend radius: Both products are not armored, so the bending radius during installation must be no less than 6 times the cable's outer diameter.
4. Operating temperature: Due to the polyvinyl chloride insulation material used in both products, the maximum operating temperature for both products under normal current-carrying conditions is 70°C. In the event of a short circuit, the maximum operating temperature does not exceed 160°C for no more than 5 seconds.
5. Insulation and Jacket: Both products use the same PVC insulation and PVC outer jacket.
Differences Between the Two
1. Different Cores: Although both products have the same number of cores, the cores differ in hardness. The cores of the former are softer, classified as soft copper conductors; the cores of the latter are harder, classified as hard copper conductors.
2. Different Applications: Both are suitable for control or monitoring circuits at or below their rated voltage. However, the former is primarily used in indoor, flexible, or unshielded applications requiring mobility; the latter is primarily intended for installation in fixed, unshielded locations such as indoor installations, cable trenches, and ducts.
