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In 50 percent of urban, suburban or suburban areas, fires are caused by electricity. Do you know what is more responsible for this accident? Inferior wire. Yes, such accidents are more common due to its low quality. Many times, fires are caused by electrical overloads and short circuits. About 50 percent of fires in factories or factory areas are caused by electricity. In addition, 60 to 70 percent of fires in the country are caused by this electrical. There are many types of wires available in the market. But it is more of a low quality. In addition, there are many problems due to not having the right idea about cable selection.

It is important to know about HT Cable Selection for your High Voltage Line and not just LT Cable Selection. Now, may be you’re thinking, how can I get a proper idea about HT Cable Selection. Don’t Worry. A Systematic Approach for Cable Selection is described in this article. So stay tuned.

What is HT Cable?

By wire or cable we mean electrical conductor wire which is made of copper, aluminum, fiber material. Through which current or electricity flows, the power of power moves. Cable is one of the important means of data communication. All data of electrical energy, electrical, electronics information technology is transmitted or communicates through cable. Cables having a rating of above 3300 V (33kV) are termed as HT cables.

What is the function of HT cable

In a word, the main function of HT cable is to carry electrical energy inside HT Switchgear or Transmission Line etc. HT cables are used in power transmission and distribution that has a range greater than 1.1 kV.

Copper and Aluminum are used as a conductor material in case of HT Cable. we TOS Electric company provides you HT Cable for 33KV, 11KV, 2000KV, 3000KV line selection at a very nominal price. Generally the size of these HT Cable varies.

Cable selection formula in high voltage line

S = (Ish * √t) / K


Ish = short circuit current (kilo-ampere)

S = cable size (square mm)

K = Wire factor (Copper factor = 0.143, Aluminum factor = 0.094)

t = Fault clearing time (the time that is selected to eliminate short circuit current in a line is called fault clearing time)

What is cable’s RM?

In the case of an electric cable or wire, rm means that the conductor of the wire is round. RM means rm = Stranded Round Conductors, below is the picture and list of Stranded Round Conductors, I hope you understand. To know the calculation of cable, to determine the size of cable, and to determine the size of cable, you need to know about rm = Stranded Round Conductors.

Why is proper HT cable sizing necessary?

There are many ways to determine HT cable size. According to some people, just looking at the catalog of a cable manufacturer, the selection process of some people is so complicated that in many cases it becomes redundant. However, the proper sizing of power cable is vital in construction because it ensures,

  • continuously perform at higher loads without being disrupted
  • Withstand the highest possible short-circuit currents flowing through the cable
  • Provide a suitable voltage to the load and avoid excessive voltage drops
  • Ensure that protective devices are operational during an earth fault.

Things to consider when determining the appropriate quality cable size.

  • What is the power (P) of the loads used to calculate
  • How to Calculate the Load Current (I).
  • How much ambient temperature should be captured (T).

Frequently Asked Question (FAQ)

  1. What is a cable tray? What are cable trays made of?

= Cable tray refers to the method or medium by which the field wires are set up in the plant. The size of the cable tray is determined by the amount of cable contained in the tray as well as the tray’s size. There are 80,150,300,450,600, and900 sample cables or wires available. Typically, cable trays are made of aluminum, steel, or fiber reinforced plastic (RFP).

  1. What are the types of short circuit faults?

= Short circuit faults mainly are of two types-

  • Symmetrical Fault
  • Asymmetrical Fault

A symmetrical fault is one that occurs in an electrical system and causes an equal amount of fault current to flow in each phase. Symmetrical faults determine circuit breaker ratings. Three phase short circuit together, three phase short circuit with earth are examples of symmetrical faults.

An asymmetrical fault is a fault in an electrical system that causes unequal fault current to flow in each phase. An asymmetrical fault stimulates the relay. Unsymmetrical faults include single line to ground faults, line to line faults, double line to ground faults, two phase short circuits together, and third phase earth short circuits.

Last Word,

With a wide and complete portfolio of electrical products, TOS Electrical Company is reknowned for its expertise in flexible and custom-made solutions. As TOS Electric Company is always ready to provide you electrical equipment with the best features made by following international standards and testing method, So visit our shop and pick your HT Cable.

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