The KG cable and its modification KG-HL are very popular among electricians. It differs from many conductors in its flexibility and resistance to low and high temperatures. The power conductor has a wide range of applications. Most often, it is used to connect electrical devices with high power. Such devices include, for example, a welding machine.
Content
- Decoding of marking
- Conductor design
- Parameters and characteristics
- Advantages and scope
Decoding of marking
The person who sees the KG cable for the first time, there will be a question about decoding such a two-letter name:
- "K" indicates that the product is a cable;
- "G" indicates that the wire is flexible.
The name of the KG conductor may contain additional letters, for example, "n", "T" or the combination of letters "ХЛ". Of course, they also appear for a reason and have a specific decoding:
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The additional letter "n" in the name indicates that the cable has a fire protection in the form of a rubber layer. The name of the conductor, designated as "КГн", should be deciphered - "flexible non-combustible cable". - If the conductor is designated "KG-T", it means that it has a tropical design. It can be used at temperatures from -10 ° C to +55 ° C.
- The most resistant to the effects of low and high temperatures is the KG-HL cable. It can withstand -60 ° C and + 50 ° C. The very decoding of KG-HL is designated as "cold-resistant".
It is often necessary to conduct electricity in harsh climates, and not every conductor may be suitable for this. If you have to install cable lines at a temperature exceeding -30 ° C, then you can use the KG-KhL cable, which is able to withstand without breaking even at -60 ° C. Such a conductor is used for industrial purposes.
Conductor design
Power flexible cable KG has a very simple design. It lacks any complex elements. Everything is as simple and clear as possible.
Standard KG conductor consists of four main parts:
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copper core; - separating layer made of PET-E film;
- rubber insulating layer;
- a rubber top layer that acts as the main shell.
The copper core can be present in a cable in varying amounts. A maximum of five copper strands can be contained in one wire. They can have a cross section of up to 240 sq. mm. Each copper conductor must be covered with a film separating layer, as well as rubber, which acts as an insulating material. The uppermost shell is also rubber.
Either numbers or colors can be used to mark the cores. In the first case, the wires are denoted by numbers, starting with one.
A "0" is used to indicate the ground loop. If the marking is done in color, then the wires can be brown, black, blue. A special color - green-yellow has a grounding conductor.
Parameters and characteristics
The KG cable can be used in a direct current circuit with a nominal voltage of 1000 Volts and in an alternating current circuit with a voltage of 660 Volts. In this case, the frequency of the alternating current should be 400 Hz. With regard to the operating temperature of the conductor, the minimum limit is -40 ° C, and the maximum is +50 ° C. Of course, this is if we talk only about the KG brand, to the name of which no letters are attributed anymore. Other varieties of this conductor may have different operating temperatures. The copper cores of the KG cable can withstand temperatures up to +75 ° C. The smallest bending radius of a conductor is 8 outer diameters.
The greatest construction length of the cable KG depends on the cross-sectional area of the copper conductors. If it does not exceed 35 sq. mm, then the construction length is at least 150 m. If the cross-section of the conductors is more than 50 sq. mm, the maximum length may be less by 25 m.
As for the service life, the KG manufacturers give a six-month warranty on their products. However, a conductor can last much longer, especially if all the rules of its operation are strictly followed. Its actual service life may exceed the warranty several times. The greatest influence on the service life of the KG cable is exerted by temperature indicators. If the conductor is used only within the specified temperature limits, it will be able to serve for quite a long time.
With regard to such technical characteristics of the KG cable as resistance, here it depends on the length product, the temperature of the ambient air or other environment, as well as the power and frequency of the flowing through it electric current. For example, with a conductor length of 1000 m, an ambient temperature of +20 ° C, a current power of 2500 W and a frequency of 50 Hz, the resistance is 50 million Ohms.
Advantages and scope
The KG cable is very popular with electricians, as it has many advantages. There are three main ones:
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The conductor is suitable for use at 100% humidity. In fact, it can be laid underwater. - The KG cable, as can be seen from the decoding of its name, has excellent flexibility.
- It can be used in installations with high vibration.
The KG conductor is used when mobile mechanisms are connected to the power grid. It can be laid both inside buildings and outside. He is not afraid of either high or low temperatures. However, it is worth remembering that using the KG conductor for a fixed connection is prohibited. Also, the conductor must not be laid underground. If you neglect this rule, then the insulating layer of the cable will not withstand the mechanical impact of the soil.
You can create a cable line on the street on cables and overpasses. However, it is important to observe safety precautions.
Often, the KG conductor is used to connect the welding machine to the network. It can also be used to connect a submersible pump or crane. The KG cable is ideal for creating an extension cord for outdoor use.
There are several modifications in the KG group. For example, one of them, called "KGVV", has a long service life: it can reach a quarter of a century. The "RKGM" modification has organosilicon insulation. Such a wire can be laid through the air.
