The designer should design and apply the flame retardant cable according to the specific characteristics of the flame-retardant cable, and pay attention to the following issues:
1) Since the halogen-containing flame-retardant cables (including flame-retardant cables and low-halogen low-smoke flame-retardant cables) will emit corrosive halogen acid gases when they are burned, which greatly impedes the firefighting work, delays the time for firefighting and exacerbates the spread of fire. Public places with high population density should try to design halogen-free low-smoke flame-retardant cables. Any kind of flame retardant cable can be used in the work area with a small population density.
2) Flame-retardant cables are classified into categories A, B, and C3. Among them, the performance of category A flame-retardant cables is better than that of categories B and C, and the price is also the most expensive. Designers should indicate the type of flame-retardant cable when ordering. 3) It is impossible to distinguish the category A, B, and C of the flame-retardant cable from the appearance, and it is only by the manufacturer to guarantee the supply. Therefore, the cable manufacturer should be carefully selected when designing.
4) Halogen-free and low-smoke flame-retardant cables have the advantages of low corrosion and low smoke compared with halogen-containing flame-retardant cables, but their electrical and mechanical properties are significantly reduced. Therefore, halogen-free low-smoke flame-retardant cables are used when laying cables. Halogen flame retardant cable should have a larger bending radius.
5) In the cable laying design, it is not appropriate to lay non-flame-retardant cables and flame-retardant cables in parallel. It is not appropriate to lay parallel the flame-retardant cables with different flame-retardant types.
Self drilling Screw made of 410 stainless steel, high hardness (40 Rockwell C), steel process.
Drilling screw is also very strong hardness, compared to the ordinary screw up, not only to maintain the ability is good, the connection object effect is also very strong, for the performance of the screw, are generally does not need auxiliary processing, can be directly on the object directly drill a Kong Sue into objects, not just use rise very convenient, Also can greatly improve the efficiency of work. This kind of drilling screw can be said to be the first choice of workers in various fields.
So what is the use of drilling screws?
1 stainless steel plate, metal plate, galvanized steel plate, engineering installation.
2 metal curtain wall metal light compartment and other indoor and outdoor installation.
General Angle steel, channel steel, iron plate and other metal materials combined installation.
4, automobile, container, shipbuilding, refrigeration equipment and other assembly projects.
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