Bonded parallel wire, also known as bonded zip cord or multiple primary wire, consists of multiple insulated conductors bonded together to form a flat, easily manageable cable. This type of wire is particularly useful in applications where multiple circuits need to be run together efficiently and neatly. 

Here's a description of its key applications:
Recreational Vehicles (RVs) and Marine Applications: Bonded parallel wire is frequently used in RVs and boats for wiring various electrical systems like lighting, accessories, and power circuits. Its design helps prevent tangling and simplifies installation in these confined spaces.

Utility Trailers: Trailer wiring for lights, brakes, and other electrical components benefits from the durable and organized nature of bonded parallel wire.
Low-Voltage Lighting: For low-voltage landscape lighting or other small DC circuits, bonded parallel wire provides a clean and simple wiring solution.
Automotive Specialty Applications (Limited): While the primary focus is on RVs, marine and trailers, you might find bonded parallel wire used in specific automotive scenarios requiring neat and organized routing of multiple low-voltage circuits.

General DC Circuits: Any application requiring the connection of multiple low-voltage DC circuits can potentially benefit from the organization and ease of installation offered by bonded parallel wire. 
Key features enabling these applications
Bonded Parallel Design: The individual wires are bonded together, forming a flat cable that reduces tangling and makes for a neater installation compared to running multiple individual wires.

Color-Coding: Many bonded parallel wires utilize color-coding (e.g., red/black or multiple colors for multiple conductors) for easy identification of circuits.
Durability and Flexibility: Bonded parallel wires are designed to be durable and resistant to abrasion, moisture, and other environmental factors encountered in applications like RVs and trailers. They also often use fine stranded copper for flexibility during installation.
Easy Separation for Termination: Although bonded together, the conductors are designed to be easily separated at the ends for termination into connectors or terminals.