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6 Differences between HT and LT Cables.

An electric cable is a bunch of more than one wires bundled together to pass an electric current. They are the most important part of the whole power transmitting systems as they help to transmit the power from one point to another. The cable comes in different sizes, shapes, and voltage range.

Difference between LT and HT Cable:

The categorization of cables can be done as low voltage cables or high voltage cables. They are also known as high tension (HT) cables and low tension (LT) cable.

Further categorization of LT and HT Cables is done as follows:

Rating: LT cables have a rating from 660 V to 1100 V. Cables having a rating of above 3300 V (33kV) are termed as HT cables.

Armouring: Armouring refers to a protective covering for a cable. Armouring is present in both the cables either round or flat armouring, but some LT cables are unarmoured.

Insulation: Unlike other cables, LT and HT cables have a layer of insulation for protection of cable from any mechanical or external factors. LT cables have insulation of materials like polyvinyl chloride (PVC) or cross-linked polyethylene (XLPE). Most of the HT cables comprises of XLPE insulation.

Conductors: Conductors used in LT and HT cables are Aluminium or Copper. Aluminum is cheaper as compared to Copper. The market price of Copper tends to fluctuate thus the pricing of cables changes with it.

No.of Cores: LT cables include cores from 1 core, 2 core and extend up to 61 cores (LT Control cables). HT cable comprises of stranded copper or aluminum conductor cores. They are 1 core or 3 core.

Application: LT and HT cables have various areas of application. LT cables can be used in industries like power distribution, power stations, railways, etc. revolving around 1.1 kV range. While HT cables are used in power transmission and distribution that has a range greater than 1.1 kV.