While they are frequently used interchangeably, understanding the distinction is important for safety and code compliance, particularly when dealing with specialized systems. Key distinctions lie in their design, application, and complexity, with junction boxes primarily. Fundamental Distinction: Terminal boxes utilize structured terminal blocks for organized, accessible connections and frequent maintenance, whereas junction boxes protect permanent wire splices and are rarely accessed after installation. Code Compliance: Both enclosures must adhere to NEC Article. A pull box contains no splices. Well, they are the same, code-wise as far as size and materials and whatnot. The only difference is that a pullbox doesn't. Two common pieces of equipment that are frequently used are electrical boxes and junction boxes.