As wire and cable products are closely related to the lives of consumers, the quality and safety of wire and cable directly affect the personal safety and property safety of consumers, so how to correctly install and use wire and cable is particularly important.

Recently, there are customer feedback on the market in the process of installing and using the cable found that the cable conductor copper wire has oxidation discoloration (black) problem, but I do not know what is the cause of the copper conductor oxidation discoloration (black)?

In order to let you have a full understanding of this phenomenon, the following Tianxing cable will share a few of the most overlooked reasons for wire and cable oxidation

What is the main cause of black cable copper conductor?

In fact, the general cable copper conductor oxidation discoloration (black) because the product production, transportation, storage, laying, use process by wet environment or rain immersed in the cable conductor, so that the copper conductor and oxygen, water chemical reaction and discoloration (black). However, the cable copper conductor oxidation discoloration (black) occurs in different parts of the cable: the cable conductor end oxidation discoloration (black); The two ends of the cable conductor are intact, and the middle conductor is oxidized and discolored (black).

The following conditions will make the cable end copper conductor oxidation discoloration (black)

1. The cable connector is improperly sealed

The cable connector seal is not packaged well, resulting in air intrusion into the copper conductor to produce black, and most of the cable head packaging master will use insulation tape directly sealed, in fact, insulation tape is not waterproof and there is a layer of glue above, a long time will make the cable black.

2. The insulation is damp

This situation is also very common, and generally occurs at the cable junction in the directly buried or row pipe. If the cable joint is not qualified and the joint is made in humid climate conditions, it will make the joint water or mixed with water vapor, and the cable will be black over time. This phenomenon is more common in the hot summer, because the humidity in the air is relatively high in summer, and the temperature will accelerate the oxidation reaction of copper conductors.

3. Use process

The customer cut the cable during the installation process without the cable head seal is not standardized construction operation, resulting in oxygen in the water, which will also easily cause the cable to black.

The two ends of the cable conductor are intact, and the middle conductor will be oxidized and discolored (black) in the following situations

1. Transportation environment

When the finished product is bumpy in the transportation process, the cable insulation layer is damaged by extrusion, bump, scratching, etc., when the local damage place of the cable copper conductor is in contact with oxygen and moisture in the air for a long time, it may be oxidized and discolored (black).

2. Copper rod pulling process

Copper rod made of various gauges of copper wire is achieved through the wire drawing process. For large drawing machine, medium drawing machine, fine wire machine process, need to add wire drawing emulsion (lubricant), if the emulsion (lubricant) remains on the surface of the copper wire is not handled well, long-term contact with the air copper surface will be oxidized discoloration (black).

3. Construction and installation

Some users do not standardize the construction when laying and installing cables, which is easy to cause mechanical damage; Civil construction on the directly buried cable is also very easy to damage the cable in operation. If the local damage place of the cable copper conductor is exposed to underground moisture or bare surface for a long time, oxidation discoloration (black) will occur.

Summarize the reasons for the oxidation discoloration (black) of the copper conductor of the above cables: everyone should find that the main reason for the black discoloration of the cable is because of the cable "water, moisture, and air immersion".

Qingdao Tianxing Cable Co., Ltd. is a technology enterprise specializing in the production of wire and cable in Shandong Province, with more than 150 sets of domestic excellent cable production equipment and testing equipment, excellent production technology, modern testing equipment, to ensure stable product quality and timely supply. The company's main products are power cable, mineral cable, high life wire and cable, radiation crosslinked cable, control cable, computer cable, photovoltaic cable, communication cable, data cable, low smoke halogen free cable, flame retardant series wire and cable.