HIGH TENSION LINE (500,000 VOLT) The vertical clearance in the lowest point of the catenary of the high-tension line crossing the access channel to Santa Fe Port (km 591) is 55.60 m referred to the zero of the port hydrometer. Considering the 45-metre security margin (High Tension Line Regulations Section 7.4), the available height for its crossing is reduced to 50.75 m referred to the zero