Standard security engineering special cable selection method

Cables are widely used in security engineering. Whether it is CCTV television monitoring, entrance and exit control, or anti-theft alarm, fire alarm, public broadcasting, intelligent wiring, automatic remote meter reading and other systems are inseparable from the thread of the needle thread. If the security system is likened to the human body, then the wire and cable products used in the security system are like the blood vessels and meridians throughout the human body. Its importance is self-evident. Engineering maintenance experience proves that high-quality security cables are very important for ensuring project quality and extending project life. Therefore, users and engineers must pay special attention when selecting cables. In general, when choosing a security cable, consider the following five aspects:

I. Enterprise Qualification and Product Quality Inspection Certificate

When a user or a contractor purchases a security cable, the first thing to pay attention to is the enterprise and product qualification materials. You need to understand the following types of qualification certificates of the manufacturer:

1. Business licenses, organization code certificates, tax registration certificates, etc. can all indicate the scale and strength of the production enterprise.

2. The national industrial product production license (wire and cable), CCC China National Compulsory Product Certification, the Ministry of Information Industry network access certificate, and ISO9001 certification are the necessary production and operating license qualifications and quality management standards for the production enterprise. Sign. Among them, in addition to the ISO9001 certificate, several other types of certificates are required, and on the contrary, they are illegally produced or operated.

3. The quality inspection report of the national authoritative department within the validity period can fully prove that the production enterprise has reached the national standard for the manufacturing and quality control of the tested products.

4. Other certificates or documents, such as industry membership certificates, honorary certificates, certification certificates, patent certificates, etc., are powerful proofs of the manufacturer's user recognition, influence and overall strength in the industry.

Regular production companies rely on the comprehensive strength of the enterprise and have obtained various types of certifications from the country. The relevant qualifications are complete. Enterprises in the daily production process, product quality from time to time to accept the supervision of the national authorities, quality and service are guaranteed. At the same time, the qualifications of enterprises and products that are complete are also the conditions that must be met for security project acceptance.

Second, price and service

When a user purchases a security cable product, after understanding and carefully reviewing the relevant certification materials of the manufacturer, the product performance and price, as well as the service and supply assurance capabilities are comprehensively measured.

As an engineering company or a direct user, it is bound to hope to maximize the efficiency and value of the use of the product at the most reasonable price with almost the same product quality. At present, all kinds of cables required for security system engineering, the mainstream security cable companies in the industry can generally be protected. Therefore, some users respected foreign brands one-sidedly, and the consumer concept of high-priced cable products was irrational. Similarly, blind pursuit of low prices and neglect of product quality is also undesirable. It should be fully realized that according to the laws of market economy, a reasonable price means reasonable quality assurance.

The homogeneity of products in the current market has become a development trend, and the price difference has become less and less obvious. It makes the service protection of products more and more important. The characteristics of the use of ancillary products require that the manufacturer provide full service, from the design of the system engineering plan to the site construction and acceptance of the project, from the normal operation of the guarantee system to the follow-up maintenance of the future, and the change of the design plan during the construction process. Individual changes and other changes require manufacturers not only to have corresponding technical forces, but also to respond quickly and improve the service guarantee system. Therefore, stable and reliable product performance, reasonable price and perfect and fast service guarantee are all important links for the purchase of security cable products.

Third, the manufacturer field trip

When users purchase cable products, it is also important for the manufacturer's scale and on-site inspection of production sites. There is a saying that goes well: "Hearing is imaginary, seeing is believing." The particularity of cable product performance determines the professionalism of cable detection methods. The average user is accustomed to determine the quality of cable from the appearance and feel, but its real technical performance and parameters must rely on professional cable testing equipment. Only then can it be achieved.

The quality of cable products is mainly determined by the following aspects: raw material procurement; production and testing equipment; production process and production process control. When a user visits a production site, the user can understand the degree of protection of the cable quality from the above points.

At present, there are a large number of domestic workshop-style wire and cable manufacturing enterprises, which are small in scale and have a single product variety. In order to reduce profits through profit, they purchase inferior and unqualified raw materials, but fake other famous brands to sell in the market. Or use various media and propaganda techniques to pack up companies and products to blind consumers. Therefore, when a large number of products are purchased or long-term cooperative suppliers are selected, it is particularly important to conduct inspections on the production site.

Fourth, product acceptance and quality identification

When the user accepts the product, it can be identified from the following aspects to determine whether the product meets the standards. Considering that the user is unlikely to have professional testing equipment, several simple and effective methods are introduced:

1. At present, the main materials of security cables are copper and polyvinyl chloride (PVC). You can use the naked eye to identify the quality of the material.

1) The copper conductor must be glossy, soft and have good tension. Conversely, the copper conductor is poorly lubricated and black, or it is already oxidized, and the conductor that has been broken by hand can be an unqualified product.

2) PVC material should be smooth surface, smooth and fine, if the surface is rough, not only shows that the plastic material, processing technology and plasticization performance is poor, at the same time, if the plastic surface has large pores, it is easy to damp and affect the product performance. In addition, the tensile strength of plastic is also very important, easily peeled with a hand-pull may be a substandard material.

3) Observe whether there is tensile protection material between the cores in the cable structure. The use of such materials can effectively protect the stability of the internal structure of the cable and improve the tensile resistance of the product during construction.

4) Use micrometer micrometer to measure the product's size, thickness, diameter, etc.

2, structural process testing

When the product is accepted by the user, the outer sheath of the cable can be stripped to inspect the structural process of the product. You can check the following items:

1) Whether the copper conductor is twisted or not is a considerable proportion of the non-regular manufacturers that omit this important process. The copper conductor is not twisted and can lead to unstable conductor structure. Under the condition of bending the cable, the construction is likely to cause cracking of the insulator or conductor penetration. Insulating layer.

2) Whether the cable pitch is too large The cable pitch refers to the node distance of the multicore cable after the core wire is twisted during the production process. Some manufacturers often amplify cable pitches in order to control costs and increase production speed. Therefore, the soft bending of the product is poor, the internal structure is unstable, and the use performance of the cable product is reduced.

3) Insulative plastic should be tightly packed on the conductor without damaging the conductor. The conductor must not be eccentric.

4) The outer sheath tightly covers the inner structure, the gap should not be too large, and the outer sheath and the inner structure have a polyester wrapping film to effectively prevent the mutual adhesion.

5) The quality of the shielding structure in the shielded cable is extremely critical for the product in security system engineering. The requirements are tight, rules and peace. In addition to the high production process requirements of production companies, production equipment is very critical. At present, several major domestic security cable companies use high-precision PLC-controlled weaving machines. The products produced by these devices are structurally stable and are arranged in a regular manner. Guaranteed excellent shielding performance.

6) Uniform outer diameter and roundness are acceptable. The vast majority of security cables are used in engineering projects. The main considerations of production companies are stable product structure and excellent transmission performance. Therefore, the roundness of appearance is generally not emphasized.