Circular junction box for optical cables on iron towers

Circular metal junction boxes for ADSS/OPGW cables provide secure, weatherproof housing for fiber splices on towers, supporting up to 48–60 fibers with IP65 protection and long-term durability.OverviewCircular junction boxes, also called metal joint boxes or splicing boxes, are designed to house fiber core splices for outdoor optical cables such as ADSS and OPGW. They are commonly mounted on iron towers or poles to connect trunk cables to distribution lines or patch panels in control rooms, ensuring organized and protected fiber management .Key FeaturesMaterial: Typically made of aluminum alloy, offering high mechanical strength, corrosion resistance, and long service life (over 25 years) under outdoor conditions .Fiber Capacity: Standard models support 12 to 60 fibers, with some configurations accommodating up to 576 fibers for larger networks .Environmental Protection: Rated IP65, capable of withstanding temperatures from -40°C to +65°C, moisture, vibration, and extreme weather .Design: Circular or dome-shaped enclosures maintain the minimum bending radius of fibers, preventing damage. Splice trays are smooth and free of sharp edges .Mounting Options: Can be mounted on towers, poles, walls, or pedestals at accessible heights. Some models are specifically designed for tower-top or aerial installations .Cable Entry and Identification: Multiple ports allow entry for several cables, with number tags for tube and fiber identification. Lockable enclosures enhance security .Advantages of Metal Circular BoxesMechanical Strength: Superior to plastic closures, providing better protection against high-voltage fields and physical impacts .Leak Tightness: Sealed with silicone and sealing rings to prevent water ingress and maintain airtight conditions .Corrosion Resistance: Suitable for long-term outdoor exposure, including high-altitude or coastal environments .Versatility: Can be used for direct, branching, or terminating joints, supporting both aerial and buried cable applications .ApplicationsTelecommunication networks: Connecting ADSS/OPGW trunk cables to distribution lines.Power transmission systems: Fiber optic monitoring and communication on high-voltage towers.CATV and network systems: Outdoor fiber management for cable TV and broadband networks .SummaryCircular metal junction boxes are essential for reliable, long-term protection of optical fibers on iron towers. They combine robust mechanical design, environmental resistance, and flexible fiber management, making them suitable for high-voltage, outdoor, and tower-mounted optical cable installations .