Use of control cables
Control cablePurpose: Mainly used for transmission of control and measurement signals. The control cable is suitable for remote operation, stove control, signal and protection measurement circuits in industrial and mining enterprises and modern high-rise buildings. Mainstream and AC 50HZ, rated voltage is 450/750V, 600/1000V and below. As a connection line between various electrical instruments and automatic instruments, it plays a role in transmitting various electrical signals and ensuring the safe and reliable operation of the system.
Control cables can be divided into ordinary control cables, flame retardant (ZR) control cables, fire-resistant (NH), low-smoke low-halogen (DLD), low-smoke halogen-free (DW), high flame retardant (GZR), temperature-resistant and cold-resistant control cables, etc.
Control cable: PVC insulated and PVC sheathed control cable suitable for industrial and mining enterprises, energy and transportation departments, control and protection lines with AC rated voltage below 450/750V.
Under the eaves. Only when the cable is not directly exposed to sunlight or ultra-high temperature, can standard LAN cables be used and pipes are advocated. Ultraviolet (UV) -Do not use cables without UV protection in direct sunlight.
On the outer wall. To prevent direct sunlight on the wall and cause man-made damage. Heat-The temperature of cables in metal pipes or trunking is very high. At this temperature, the service life of many aggregated data will be reduced.
In pipes (plastic or metal). For example, in the pipeline, pay attention to the damage of the plastic pipe and the heat conduction of the metal pipe. Mechanical damage (retrofit costs)-Cable retrofitting is very expensive and requires at least two terminations per successive point.
Suspended operation/overhead cable. Consider cable sag and pressure. What binding method are you going to choose? Is the cable exposed to direct sunlight.
Directly laid in the underground cable trench, this environment is the least control scheme. The equipment in the cable trench should be checked in time for monotony or moisture. Earthing-If the shield of the control cable needs to be grounded, it needs to meet the corresponding specifications.
Underground pipes. In order to facilitate future upgrades, replace the cable, isolated from the external pressure and the surrounding environment, the auxiliary pipeline is isolated, and the auxiliary pipeline is a better way. But do not want the pipeline to remain monotonous for a long time, affecting the choice of cable type. Moisture in a twisted-pair cable in a LAN increases the capacitance of the cable, which in turn reduces the impedance, causing near-end crosstalk.
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What are the main points of purchasing wires and cables? Let's take a look. As the main carrier of power transmission, wire and cable are widely used in electrical equipment, lighting circuits, household appliances, etc. Its quality directly affects the quality of the project and the safety of consumers' lives and property. There are many wire varieties on the market, and appropriate wires should be used according to their own power load.
What are the precautions for wires and cables? Let's take a look. Common cable faults: wire surface markings-according to national standards, the wire surface should have continuous markings of the manufacturer's name, product model and rated voltage. This helps to find the manufacturing plant in time when there is a problem during the use of the wire, and consumers should pay attention to this when buying the wire.
There are many kinds of wire and cable products for electrical equipment on the market, which are difficult for ordinary consumers to distinguish. So what are the main categories of wire and cable products? What are the product naming principles of wire and cable? The editor brings you a brief understanding of relevant content knowledge.
The wires and cables for electrical equipment are mainly used for internal or external connection of electrical equipment, low-voltage transmission lines and various electrical signal transmission lines. Generally speaking, except for power cables, communication cables and magnet wires, most insulated wires and cables are classified as wires and cables for electrical equipment.
Electrical equipment with wire and cable is a large class of wire and cable products, a wide range of applications, many varieties, many series, large output, process type complex. The rated voltage of wires and cables for electrical equipment is low, and the working voltage is 450/750v and below, which is not more than 0.6/1kv. The working voltage of signal and instrument cables is usually 300/500v and below. The ampacity of the cable is determined according to the requirements of the cable.
Low voltage power cable winter pay attention to matters? As the weather gets colder and colder, manufacturers of low-voltage power cables usually become more difficult, which brings inconvenience to construction. Here are some precautions for winter construction. Let us take a brief look.