In winter, the weather becomes cold. When installing wires and cables, you will find that the wires and cables of good quality usually have some phenomena such as hardening of the wire body and falling off of the insulating sheath. Many buyers think that it is the wire and cable products themselves. However, the cable manufacturers also insist that the products have been inspected before leaving the factory and are qualified products, which often leads to misunderstandings between the two parties.
In fact, it is not the quality of the product itself that is wrong, but due to the severe cold in winter. The outer skin of wire and cable products is mostly ordinary plastic (PVC) or rubber. When they are in a sub-zero environment, they will become hard, and the entire wire and cable product line will become hard and brittle, resulting in the outer skin may be under the action of slight external force. fall off or be damaged. In winter, especially in northern regions, the outdoor temperature is often below zero, and the surface temperature may be lower. Therefore, if the wire and cable products are placed outdoors or directly on the ground, the outer skin of the product is likely to fall off. Then, in order to prevent the above situation, the following measures can be taken:
1. Shipping from the factory: When the product is loaded on the transportation vehicle, it is necessary to take warm and protective measures. For example, use a closed transport tool to prevent the product from being directly exposed; cushion the product with a softer material; handle it with care when loading, do not load the product roughly, and avoid excessive bending of the product.
2. When arriving at the destination or the construction site, the product supplier should send personnel to supervise to prevent rough operation when the product is unloaded.
3. Storage: It is best to store the product indoors, and at the same time, lay a layer of isolation layer on the storage surface, such as wood, bedding, foam, etc., to prevent the product from being frozen and damp, and pay attention to prevent the product from direct contact with the ground. If the cable sheath is scratched, handle it with care.
4. When the product is laid and installed: it is best to choose to work in the case of warmer temperatures in the afternoon and afternoon, and install it in a state of good product performance. If it is buried in the ground, a protective layer, such as cloth and foam, can be laid in the cable trench in advance. If it is a pipe, make sure that the inside and outside of the pipe is smooth so that the wire will not be scratched. Special attention should be paid to iron pipes. When purchasing high-quality iron pipes, there may be a large number of sharp protrusions in the low-quality iron pipes, which are very likely to scratch the outer skin of the wires.
5. Select low-temperature cables and test them in strict accordance with the test requirements of the national standard "GB/T2951.14-2008", place them in an environment of minus 35 ℃ for 16 hours, and then carry out mechanical performance tests. And the jacket is tested for elongation and tensile strength, and the pass rate is 100%.
