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The final selection of welding equipment must have the following considerations: 1. The ability of the equipment to weld the specified material. 2. The cost of the equipment. 3. The voltage regulation imposed on the supply system by various types of machines. 4. The cost of reinforcement of the present supply system versus the cost of the machines and their correction devices. 5. The total of machines involved and their diversity factor. 6. The rate of production of one system versus another keeping in mind the limitations of each system and the number of machines involved. The a-c single-phase machine is generally found the most economical if the power supply is adequate, if not, a complete study must be made of the total installation and the power system before recommendation of any certain type of machine and its correction device versus power-system reinforcement.