351 — ELECTRIC POWER GENERATION, TRANSMISSION AND DISTRIBUTION
3510Electric Power Generation, Transmission and Distribution352 — MANUFACTURE OF GAS; DISTRIBUTION OF GASEOUS FUELS THROUGH MAINS
3520Manufacture of Gas; Distribution of Gaseous Fuels Through Mains353 — SUPPLY OF AIR OR WATER FOR COOLING OR HEATING PURPOSES
3530Supply of Air or Water for Cooling or Heating Purposes