Final answer:
The installation of welding equipment falls under NEC Chapter 4, which focuses on equipment for general use, including specifics in Article 630.
Step-by-step explanation:
The installation of welding equipment is covered in NEC Chapter 4, specifically in Article 630. The National Electrical Code (NEC) is a United States standard for the safe installation of electrical wiring and equipment. While Chapter 1 covers general requirements for all electrical installations, Chapter 2 details wiring design and protection, and Chapter 3 covers wiring methods and materials, it is Chapter 4 that addresses equipment for general use, which includes welding equipment.