The sheathed wire is a type of insulated electrical wire with a plastic outer covering, typically available in double-core or multi-core configurations. As depicted in the accompanying image, its design offers protection against moisture, acids, and corrosion. This type of wire can be directly installed within hollow floors or structures, using line clips to secure the wire to surfaces. The process of laying sheathed wires is straightforward, resulting in neat and aesthetically pleasing installations at a lower cost compared to traditional methods. Currently, this wiring solution is widely used for electrical lighting and similar distribution systems within buildings. However, it's important to note that sheathed wires should not be buried within plastering layers or exposed outdoors.
One of the key roles of the sheathed wire is its ability to provide moisture-proof, anti-corrosive, and electrical protection. The outer plastic insulation serves as a barrier, safeguarding the internal wires and extending their lifespan. Essentially, the sheathed wire consists of a layer of rubber encasing multiple conductors, forming the final protective outer layer.
When discussing the specifications of sheathed wires, they fall under the broader category of cables. Commonly referred to as RVV or BVV cables, these wires differ slightly in terms of flexibility and construction. The RVV cable is flexible and suitable for applications requiring movement, while the BVV cable is rigid and fixed in place. Both types conform to GB standards and meet 3C certification requirements. The conductors themselves vary; RVV uses oxygen-free copper wires, making the cable flexible, whereas BVV employs single-strand conductors, rendering it less pliable.
In terms of installation, preparing the sheathed wire involves careful planning. The distance between support points should ideally range from 15 to 20 centimeters, with fixed intervals set at 5 to 10 centimeters. Line cards can be secured using small nails or epoxy-bonded aluminum wire cards, depending on the surface type. When laying the wire, ensure it remains untangled and undamaged; two people should work together to pull the wire smoothly without dragging it on the ground. Cutting the wire to fit specific lengths with some margin can also simplify the process.
Proper alignment is crucial for a clean installation. Horizontal and vertical lines should be straightened before being secured to the wall using line cards. For longer runs or multiple wires, grouping them temporarily with splints before tightening ensures neatness. Bends in the wire should maintain a radius of at least three to six times the wire’s specification to prevent damage.
Some important considerations include ensuring the wire cross-section meets minimum requirements—0.5 mm² for copper and 1.5 mm² for aluminum indoors, and 1.0 mm² for copper and 2.5 mm² for aluminum outdoors. Connections should never be made directly along the line but via porcelain connectors, junction boxes, or terminal posts. Protective tubing is essential when passing through walls, floors, or areas prone to mechanical stress.
While sheathed wires running through hidden conduits pose minimal risks, prolonged use under high current conditions may lead to overheating. For households with high-power appliances like air conditioners or ovens, it’s advisable to consult an electrician to verify compatibility.
Lastly, distinguishing between wires and cables is essential. While both share similar structural components—core wires, insulating sheaths, and protective covers—their differences lie in size, flexibility, and complexity. Wires tend to be smaller, simpler, and often uninsulated, while cables are larger, insulated, and frequently multi-core.
In conclusion, sheathed wires offer a practical, cost-effective solution for modern electrical installations, provided proper guidelines are followed during installation. Their versatility and durability make them indispensable in today’s electrical landscape.
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