How to buy wire and cable?


Published on:

2022-09-29

Fire-resistant cable refers to the cable that can maintain a certain period of safe operation under the premise of flame burning. In China's national industry standard GB12666.6 (etc. IEC331) will be fire-resistant materials experiments into A, B these two levels, A flame temperature of 950 ~ 1000 ℃, constant supply fire length of 90min, B flame temperature of 750 ~ 800 ℃, constant supply fire length of 90min, all experimental period, the test piece should bear the rated current value specified by the commodity.

Tell us how to buy wire and cable?

Fire-resistant cable refers to the cable that can maintain a certain period of safe operation under the premise of flame burning. In China's national industry standard GB12666.6 (etc. IEC331) will be fire-resistant materials experiments into A, B these two levels, A flame temperature of 950 ~ 1000 ℃, constant supply fire length of 90min, B flame temperature of 750 ~ 800 ℃, constant supply fire length of 90min, all experimental period, the test piece should bear the rated current value specified by the commodity.

Fire-resistant cables are widely used in multi-story buildings, underground railroads, underground streets, large and medium-sized power plants and more important factories and mining enterprises and other areas related to fire safety and fire rescue, for example, the power supply lines and control circuits for emergency facilities such as fire-fighting equipment and emergency guidance lights.

1, the insulation layer of the wire sheath (generally more than 100MΩ) and voltage strength (500V above 1500V below).

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

3, sustained high-temperature impact 140 degrees, ultra-low temperature -30 degrees under the wire must not occur dry cracking.

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

When storing the cable, there are any things to pay attention to?

1, the cable should be frequently turned over during storage (3 months in summer, other times of the year can be considered for extension as appropriate).

2、When rolling down the side of the reel, be sure to avoid wet and cold at the bottom surface, and pay attention to whether the cable head is intact when stored.

3, the storage period of the cable should be limited to the production time of new products, not more than one and a half years, and very long not more than 2 years.

4, it is prohibited to put the cable or cable cable bridge at high disposal, especially at relatively low ambient temperature (usually below 5 degrees Celsius).

5, when lifting, not at the same time lifting several thick steel plate. Vehicles in, ships and other carriers, cable cable bridges as far as possible fixed immobile, to avoid impact or tipping, to avoid mechanical damage to the cable.

How to identify the true or false continuous high temperature wire and cable

1, electrical conductor resistance measurement exceeds the standard. Wire and cable copper conductors should be applied to high purity electrolytic nickel, this loess material pulled out of the wire uniform and glossy. Some applications of recycled copper manufacturing enterprises to get strong profits, or second best to reduce the copper area, resulting in line conductor resistance is more serious ultra-standard.

2, insulation layer and protective cover loess material should be suitable for physical properties (tensile strength, tensile strength) index value failed part of the wire and cable insulation layer and protective cover loess material should be selected plastic recycling, its tensile strength and tensile strength can not meet the application regulations. The cable is very easy to crack the structural mechanics of the process, which can lead to short-circuit failure and walk charge and discharge.

3, high-voltage cable insulation layer thermal broadening of the new project is not pass. Some new products of the insulation layer thermal broadening appears to melt off condition, in the premise of high temperature is easy to lead to short-circuit fault safety accidents.