RVV cable, short for copper-core PVC insulated and sheathed flexible wire, is also known as lightweight PVC sheathed flexible cable, commonly known as soft-sheathed cable. It is a type of sheathed cable commonly used in daily life. But have you noticed white powder inside a power cable when you cut it? What is this white powder? Let's find out.
What is RVV cable?
RVV sheathed power cable, commonly used in low-voltage cables for monitoring systems, has a variable number of cores, two or more, with no specific requirements for the arrangement of the cores.
RVV extruded power cable is extruded using a die, with the internal voids directly filled with PVC. It is generally compact, rounded, and durable.
The outer PVC sheath of an extruded power cable primarily protects the inner sheath from mechanical damage and chemical corrosion, and provides tensile and compressive strength. After cutting the PVC sheath, you'll find white powder between the wire pairs.
What is the purpose of the white powder inside an RVV cable? This powder is actually talcum powder, which has properties such as lubricity, anti-sticking properties, flow properties, fire resistance, acid resistance, insulation properties, softness, good gloss, and strong adsorption.
The talcum powder in RVV power cables primarily prevents the outer PVC sheath and inner sheath from sticking together during the production process. This helps reduce friction between the wire cores, preventing direct contact and possible damage to the sheath.
Two-core power cables are the most commonly used specifications in surveillance systems, with common specifications being 2*0.5, 2*0.75, 2*1.0, and 2*1.5.
Power cables are made of copper-clad aluminum, pure copper, and oxygen-free copper. Copper-clad aluminum has poor oxidation resistance and is easily oxidized during use, resulting in a short lifespan.
Both pure copper and oxygen-free copper have relatively high oxidation resistance, but pure copper contains high levels of impurities, resulting in higher resistance and a limited transmission distance. Oxygen-free copper has a higher copper purity and lower resistance, resulting in better transmission performance.
The above is an introduction to RVV cables. I believe everyone is familiar with them by now. They are primarily used as power cables, control cables, and signal transmission cables for electrical appliances, instruments, electronic equipment, and automation devices. Specifically, they can be used in burglar alarm systems and building intercom systems. Don't panic if you see white powder inside the cables; it's not a quality issue; it's a lubricant that extends the cable's lifespan.
