Winter wire and cable damage causes and preventive measures

Winter cold, many construction workers in the laying and installation of wire and cable will find that the usual good quality wire and cable products, there will often be some hard wire, insulation skin off damaged and other phenomena, many construction workers think it is the wire and cable products itself quality problems, and cable manufacturers also insist that the product has been tested at the factory, is a qualified product, often leading to misunderstandings between the two sides. Not the quality of the product itself what is wrong, but due to the winter cold. Wire and cable products are mostly ordinary plastic (PVC) or rubber, when they are in the sub-zero environment, it will harden, the entire wire and cable product line body will be hard, brittle, resulting in the outer skin may be in the case of a slight external force will be peeled off damaged. In winter, especially in the northern region, the outdoor temperature is often below zero, the surface temperature may be even lower, if the wire and cable products are placed outdoors or directly on the surface, it is likely that the product skin off the phenomenon. 1, factory transportation: in the product factory loading to the means of transportation, the need for warmth and protective measures. For example, the use of closed means of transportation, to prevent direct exposure of the product; to the product on a layer of soft cushions, such as bedding or other soft foam, etc.; loading gently, do not rough loading, while avoiding the product appears to be too large bending. 2, unloading: arrival at the destination or the construction site, the product supplier is better stationed to supervise the personnel, to prevent product unloading of the product appears to be rough operation behavior. 3, storage Better to put the product indoor storage, while in the storage of the surface on a layer of isolation, such as wood, bedding, foam, etc., to prevent the product from freezing and moisture, pay attention to prevent direct contact between the product and the ground will be the phenomenon of wire and cable skin scratches, gently take and put. 4, the product laying and installation: a better choice of mid-afternoon temperatures in the case of warmer operations, such as conditions can be used before the use of heater and other equipment ahead of the product "warm up"! Product "warm up", so that the product to achieve better performance status. If it is buried in the ground, a layer of protection can be laid in the cable trench beforehand, such as fabric, foam. If you are wearing a pipe, you have to ensure that the inside and outside of the pipe is smooth, so as not to scratch the wire. Iron pipe should pay particular attention to the purchase of quality-qualified iron pipe, low-quality iron pipe may have a large number of sharp bumps inside the pipe, it is very likely that the outer skin of the wire scratched. 5, the selection of low-temperature cable: selection of low-temperature cable must be in strict accordance with the standard "GB/T2951.14-2008" test requirements for testing, placed in the environment at minus 35 ℃ 16h, and then the mechanical properties of the test, to their Repeated bending and flexing, the insulation as well as the sheath of the elongation and tensile test test, the pass rate of up to. Low temperature cable has strong low temperature resistance, can be in the cold external environment, insulation and sheath skin can still ensure that no cracks, not fracture state.

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