What is HT(High Tension) line? All Questions › Category: Electrical Estimating And Costing › What is HT(High Tension) line? 0 Vote Up Vote Down CS Electrical And Electronics Staff asked 4 years ago I need short information. 1 Answers 0 Vote Up Vote Down Chetan Shidling answered 4 years ago The ht line means nothing but conductor which is used to transmit energy from substation to distribution transformer.