What are the small holes in the terminal box

The small hole on a terminal box is typically located at the cable entry point, designed for inserting or securing wires or fiber cables.In most terminal boxes, including JB terminal boxes and optical fiber termination boxes, the small hole serves as the entry point for cables. For fiber termination boxes, this hole is often covered by a rubber diaphragm that must be pierced after preparing the cable ends, ensuring the fibers are protected from damage and environmental exposure during installation . In standard electrical terminal boxes, small holes may also allow multimeter probe access or provide a path for securing wires with connectors or zip ties . Key points about the small hole:Position: Usually at the bottom or side of the box where cables enter.Function: Allows cables to pass into the box while maintaining a snug fit to prevent movement or loosening.Protection: In fiber boxes, the rubber diaphragm around the hole protects delicate fibers from bending or breaking.Access: Some holes are designed to provide easy access for testing equipment without opening the entire box. When installing or using a terminal box, always ensure the cable is properly prepared and the hole is used according to manufacturer instructions to maintain safety and functionality . This small hole is essential for both secure cable entry and protection of internal connections.