The basics of cables and their accessories! Ten questions and answers!

This is one of the most comprehensive knowledge of cables and their accessories, if you are recently choosing quality cables and their accessories, then welcome to bookmark this article. As a professional cable team, ZMS Cables will take you through the cables and their accessories.

1 What are the varieties of commonly used cables by application?

All cables can be divided into bare conductors, insulated cables, heat-resistant cables, shielded cables, power cables, control cables, communication cables, radio frequency cables, and so on according to their applications.

Overhead Conductor (Bare Conductor)

Bare conductors include overhead insulated cables, aluminum alloy conductors, and so on.

The advantages of overhead conductors are so great that they can be said to be everywhere in the world today in almost every country.

This is because they have the ability to transmit electricity with ultra-high strength.

In addition to this, the good safety factor of the power supply system and the ease of erection and maintenance are also a few of the advantages that make it one of the most popular cables in the world.

Shielded Cables

Shielded cables are cables with one or more mutually insulated wires wrapped in a common conductive layer.

This common conductive layer is the shielding layer of the cable, which is generally composed of braided strands of copper or other metals, non-woven spiral winding of copper tape, or conductive polymer layer.

The shield can be wrapped inside the signal or power conductor, both ways to prevent electromagnetic noise interference.

2 What are the common types of insulated cables?

There are several types of commonly available insulated cables:

Polyvinyl chloride insulated cables

Polyvinyl chloride insulated flexible cables

Nitrile polyvinyl chloride mixture insulated flexible wire

Rubber insulated cables

Agricultural underground directly buried aluminum core plastic insulated cable

Rubber Insulated Cotton Yarn Textile Flexible Wire

PVC insulated nylon sheathed cables

Polyvinyl chloride insulated flexible cables for power and lighting purposes

The insulation materials chosen for cables in different environments are as follows:

Polyvinyl chloride (PVC): inexpensive, easy to process, lightweight, good electrical properties, corrosion resistance, chemical stability, moisture resistance, non-flammable.

Thus, the low-voltage distribution lines, especially in the terminal circuit, are widely used as the basic insulation and sheath materials.

Cross-linked polyethylene (XLPE): good insulation, high current-carrying capacity, low dielectric loss, lightweight, corrosion-resistant, moisture-resistant, cold-resistant, halogen-free, and does not emit large amounts of toxic fumes when burned.

Ethylene Propylene Rubber (EPR): cross-linked ethylene-propylene rubber, high flow-carrying, halogen-free, will not emit a lot of smoke when burning.

It also has flame-retardant properties and ozone-resistant stability and can be used in low-temperature environments of -50℃.

3 What kind of applications are cable trays suitable for?

Cable trays are usually used for the overhead laying of power cables and control cables indoors and outdoors in industrial and mining enterprises.

It can also be used for telecommunication, radio television, and other parts of indoor and outdoor erection.

4 What are the cable accessories?

Cable Glands.

Cable Lugs.

Plugs and Connectors.

Cable Markers.

Wire Tools.

Cable Cleats.

Wire Conduit.

Cable Ties.

Cable Terminals

Wire Sleeving

5 What is the cable intermediate joint?

Connecting the conductor between two cables, insulation shielding, and maintenance layer of the equipment, so that the cable line connection, is known as cable intermediate joints.

A device that connects the conductor, insulation shield and maintenance layer between two cables.

6 On the electrical main wiring

Electrical main wiring is a power plant or substation in the primary electrical equipment. And bus connection method, including the main bus and plant power system according to certain functional needs of the connection method.

7 In the selection of the power cable cross-section, what rules should be followed?

The selection of power cables should comply with the following guidelines:

(1) The rated voltage of the cable should be greater than or equal to the rated voltage of the power supply system at the installation point.

(2) The continuous allowable current of the cable should be equal to or greater than the maximum continuous current of the supply load.

(3) The cross-section of the wire core should meet the needs of the stability of the power supply system in the event of a short circuit.

(4) According to the length of the cable check whether the voltage drop is in line with the needs.

(5) The minimum short-circuit current at the end of the line should be able to make the maintenance equipment reliable action.

9 Fixed AC single-core cable clamps have any precautions?

The cable fixture should be free of iron components constituting a closed magnetic circuit.

This is because when the cable core is through the current, in its surrounding magnetic lines of force, magnetic lines of force, and the size of the current through the core are directly proportional.

If the use of iron and other magnetic materials, based on electromagnetic induction can be seen. Will be in the iron pieces of eddy currents in the cable heating, or even burn the cable.

So do not use iron for single-core AC cable fixed fixtures.


10 What are the biggest features and benefits of heat-shrinkable cable head accessories?

The biggest feature of heat-shrinkable attachment is to replace the traditional stress cone with a stress tube.

It not only simplifies the construction process but also reduces the standard of the terminal of the connector, is easy to equip, saves time and labor, has superior performance, and saves metal.

Heat-shrinkable cable accessories set infusion type and dry pack type as a whole, mobilizing the interests of these two kinds of accessories.

The above is some basic knowledge about cables and their accessories.

As one of the most essential items in daily life and national infrastructure, cables contain more theoretical knowledge behind them.

If you are interested in cables or hope to find the quality cables you need most through this knowledge, welcome to consult the ZMS cable team, we will have professional cable representatives to answer your questions.