Wire and cable manufacturers talk about how to buy wire and cable?

Fireproof cable refers to a cable that can maintain a safe operation for a certain period of time under the premise of flame burning. In China's national industry standard GB12666.6 (IEC331), refractory experiments are divided into two grades A and B. The temperature of Class A flame is 950~1000 ℃, the continuous fire supply time is 90min, the temperature of Class B flame is 750~800 ℃, and the continuous fire supply time is 90min. During the whole experiment period, the test piece shall bear the rated current value specified by the commodity.

Fireproof cables are widely used in multi-storey buildings, underground railways, underground streets, large and medium-sized power plants and more important factories and mines and enterprises and fire safety and fire rescue related areas, for example, fire equipment and emergency guidance lights and other emergency facilities power supply lines and control loop.

1. The insulating layer (generally over 100MΩ) and compressive strength (above 500V and below 1500V) of the protective wire sleeve.

2, line resistance (a certain cable diameter, conductivity, length shall not exceed a certain resistor).

3, continuous high temperature impact of 140 degrees, ultra-low temperature -30 degrees under the wire can not be dry and so on.

4, appearance specification, wire must have certification certificate, manufacturer, cable diameter, etc., grounding wire with light green cable sheath.

Do wire and cable manufacturers have anything to pay attention to when storing cables?

1. The cable should be turned over frequently during storage (3 months in summer, and extension can be considered at other times as appropriate).

2. When the reel is rolled down, the surface layer at the bottom must be avoided from being wet and cold. When storing, attention should be paid to whether the cable head is intact.

The storage period of the cable should be limited to the production time of the new product, not more than one and a half years, and not more than 2 years.

It is forbidden to put cables or cable trays at high disposal, especially at relatively low ambient temperatures (usually below 5 degrees Celsius).

5. When lifting, do not lift several thick steel plates at the same time. In vehicles, ships and other vehicles, the cable tray is as fixed as possible to avoid collision or overturning, so as to avoid mechanical damage to the cable.

Wire and cable manufacturers: how to distinguish between true and false continuous high temperature wire and cable

1. The measurement of electrical conductor resistance exceeds the standard. The copper conductor of wire and cable should be applied with high purity electrolytic nickel, which is evenly balanced and glossy. Some applications of recycled copper manufacturing enterprises get strong profits, or shoddy to reduce the copper area, resulting in wire conductor resistance is more serious than the standard.

2. The materials of insulating layer and protective cover shall be suitable for physical properties (tensile strength and tensile strength). Part of the wire and cable insulation and protective sheath materials should be selected from plastic recycling, its tensile strength and tensile strength can not meet the application requirements. The structural mechanics process of the cable is very easy to crack, which will lead to short circuit fault and charge and discharge.

3, high-voltage cable insulation thermal expansion of new projects but off. The insulation layer of some new products is thermally widened and melted, which is easy to lead to short circuit fault safety accident under the premise of high temperature.