Section VIII Hydropower Material Knowledge
First, plumbing categories:
Aluminum plastic composite pipe:
Aluminum-plastic composite pipe is a kind of pipe material that is more popular on the market. Due to its light weight, durability and convenient construction, its flexibility is more suitable for use in home furnishings. Its main drawback is that when it is used as a hot water pipe, due to the long-term thermal expansion and contraction, the pipe wall may be misaligned and cause leakage.
PVC pipe:
PVC (polyvinyl chloride) plastic pipe is a modern synthetic material pipe. However, in recent years, the scientific and technological community has discovered that chemical additives that can make PVC more flexible will have a great impact on the kidneys, liver, and testicles in the human body. This will lead to cancer and kidney damage and damage the human body's functional reengineering system and affect development.
In general, because its strength can not be applied to the pressure requirements of water pipes, it is rarely used in water pipes. In most cases, PVC pipes are suitable for wire and sewage pipes.
PP-R tube:
PP-R (block copolymerized polypropylene) is also commonly referred to as a hot-melt tube because it uses a welding technique during construction. Due to its non-toxicity, light weight, pressure resistance, and corrosion resistance, it is becoming a popular material, but at present, there are few choices for decoration projects. Generally speaking, this material is not only suitable for cold water pipes, but also suitable for use. In hot water pipes, even pure drinking water pipes.
Second, wire categories:
Household power cords should use BVV2 x 2.5 and BVV2 x 1.5 models of wires. BVV is a national standard code and is a copper sheathed wire. 2x2.5 and 2x1.5 represent two cores 2.5 mm2 and two cores 1.5 mm2 respectively. Under normal circumstances, 2 × 2.5 as the main line, trunk, 2 ×
1.5 do a single electrical branch, switch line. The single-phase air-conditioning line uses BVV2 × 4 and is equipped with a dedicated ground wire.
To purchase electric wires, first of all, see whether the “Great Wall Mark†and the production license number of the China Electrical Products Certification Committee are on the packaging of the wound wire; see if the outer plastic skin of the wire is of bright color and fine texture. There should be no open flame when lit with a lighter. Informal products use recycled plastics,
Dark color, loose texture, can ignite the open flame; Secondly, look at the length, specific price, BVV2 x 2.5 The length of each roll is 100±5 meters, the market price is about 280 yuan, the length of non-regular products is 60-80 meters, Some manufacturers have made the E-insulation jacket thick, so that the experts are also difficult to see the problem, generally can count the number of turns of the wire, and then multiplied by the radius of the entire roll, you can roughly calculate the length, the price of such products in 100 - Between 130 yuan; Second, you can ask businesses to cut off a break to see the copper core material. 2×2.5 copper diameter 1.784mm, available micrometer measuring, regular product wire using red copper, outer bright and slightly soft, non-regular copper black and hard, is a regenerative copper, resistance The high rate and poor electrical conductivity can raise temperature and make it unsafe. Finally, the purchase of electrical wires should go to the electricity shop or the manufacturer's sales department.
Third, electrical accessories:
Fourth, switch socket categories:
Entrance decoration restaurant renovation door price socket electrical air conditioning prices
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