How to choose the right way to use wire and cable?
At present the brand of electric wire on the market is various, because the production craft that electric wire makes is relatively simple, capital investment is not big, belong to what say commonly "short and flat fast" project, consumer lacks enough professional knowledge to regular product understanding, consequently a few manufacturers play in turn "edge ball" come. So in the face of a variety of wire products, how to choose and buy in line with the national standards, so that people both at ease and satisfied with the wire? Let's take a look at the basics of shopping:
Look at the appearance: the insulation (sheath) layer of the qualified products is soft, tough and very flexible, the surface layer is tight, smooth, without roughness, and has pure glossiness. Insulation (jacket) layer surface should be clear and friction-resistant signs, informal insulation materials produced products, insulation layer feel transparent, brittle, no toughness.
Look at the insulation layer: The national standard has a clear data regulation on the thinnest uniformity and average thickness of the wire insulation layer. Normal wire insulation layer thickness is uniform, not biased core, and tightly packed on the conductor.
See a certificate: the standard product certificate should indicate the factory name, address, after-sales service telephone, the structure of the model, specification, nominal section (i.e., usually said 2.5 square, four square wire, etc.), rated voltage (single conductor 450/750 v, two core cases line 300/500 v), length (the length of national standard for 100 M + 0.5 M), the analyst job number, manufacturing date, and number of the national standard for the product or certification marks. It is particularly noted that the model number of the single-core copper-core plastic wire normally indicated on the regular product is 227IEC01 (BV) rather than BV. Please pay attention to identify.
Wire core: select pure copper raw material production and after strict drawing, annealing (softening), stranded wire core. Its surface should be bright, smooth, no burr, tight degree of evenness, soft and tough, not easy to break.
For domestic power cord, BVV2×2.5 and BVV2×1.5 should be used. BVV is the national standard code for copper sheathed wire, 2×2.5 and 2×1.5 respectively representing 2 cores 2.5 mm square and 2 cores 1.5 mm square
In general, 2×2.5 main lines and main lines and 2×1.5 single electrical branch lines and switch lines. BVV2×4 is used for single-phase air conditioning special line with special ground wire.
When purchasing electric wires, the first step is to consider whether there is a production license number on the packaging plate of the wire coils. See wire outer plastic skin again whether colour and lustre is bright, quality of a material is close, light with lighter should have no open flame. Informal products use recycled plastic, dull color, loose texture, can ignite an open flame. Look next length, compare price. Informal products range in length from 60 to 80 meters. Some manufacturers thicken the insulation, making it difficult for experts to see the problem. Then you can ask the business to cut off a piece, see the copper core material 2×2.5 copper core diameter 1.784 mm, you can use the micrometer measure. Normal product wire using fine red copper, bright and slightly soft outer layer. Informal product copper is black and hard, is a regenerative hybrid copper. High resistivity, poor conductivity, temperature will be unsafe. Finally, you should go to buy electrical wiring to hand in electric shop or the professional shop such as manufacturer outlet to buy.
Selection of wires: the sectional area of wire groove is generally: lighting line with 1.5 mm, socket line with 2.5 mm, air-conditioning line with no less than 2.5 mm, wiring line with green and yellow double color line, switch line (fire line) with red, white, black, purple and other kinds of. But the color utility that USES line in same home outfit project should be consistent.
Threading pipe selection: threading pipe applies flame retardant PVC pipe, the surface of the pipe wall should be smooth, the wall thickness is required to reach the strength of the fingers with hard knead, and there should be a certificate of qualification, you can also use national standard special galvanized pipe to do threading