A low tension line simply means low voltage and a high tension line simply means high voltage. If you have a three-phase connection you receive an LT supply of 400 volts. For a single connection, you will receive 230 volts. If you require bulk power to run your system you will be needing High tension or HT supply.
What is HT and LT in electrical? LT (Low Tension) vs HT (High Tension) Tension is a French word for Voltage. A low-tension line is a low voltage line and a high-tension line is a high voltage line. In India LT supply is of 400 Volts for three-phase connection and 230 Volts for single-phase connection.
Typical tariff codes start with LT (Low Tension) or HT (High Tension). LT codes refer to 'Low Tension' connections which are usually used for housing connections and personal offices. HT codes refer to 'High Tension' and are usually used for bigger industries and complexes.
HT (high tension) and LT (low tension) are synonymous with high voltage and low voltage respectively. LT refers to any voltage upto 1000volts e.g. 440v, 220v,110v etc. HT refers to voltages above 1000volts e.g. 11kv, 33kv, 220kv,400kv etc. This classification applies to all equipment and