Panduit FRSPJ4X4LYL 4x4 Spill-Over Fiber Junction

Panduit FRSPJ4X4LYL FiberRunner 4x4 Spill-Over Junction

The Panduit FRSPJ4X4LYL is a yellow polycarbonate/ABS spill-over junction engineered for fully enclosed fiber routing in data centers and telecommunications central offices. It mounts directly to existing 4x4, 6x4, 12x4, or 24x4 FiberRunner channel installations without requiring alterations to the pathway, eliminating the downtime and material waste associated with cutting, splicing, or re-terminating runs. UL Listed to Standard 2024 for Optical Fiber Cable Routing Assemblies and compliant with Telcordia GR-63-CORE Network Equipment Building Systems (NEBS) Level 3 seismic and environmental testing, this junction meets the reliability standards telco operators and colocation providers demand for carrier-grade infrastructure.

Key Features

• Universal compatibility — fits 4x4, 6x4, 12x4, and 24x4 FiberRunner channels with no pathway modifications
• No-alteration mounting — installs directly onto existing channel runs, preserving fiber bend-radius protection and system integrity
• UL 2024 Listed and Telcordia GR-63-CORE Level 3 compliant — meets seismic Zone 4 and temperature cycling requirements for carrier-class deployments
• High-visibility yellow polycarbonate/ABS construction — maintains color-coding standards in multi-vendor environments and resists UV degradation
• RoHS compliant — safe for disposal and compliant with environmental regulations in controlled-environment data halls

Spill-over junctions solve a recurring problem in large-scale fiber builds: when perpendicular pathways intersect or when a vertical riser meets a horizontal distribution run, installers need a transition that maintains full enclosure without forcing cables through sharp 90-degree bends. The FRSPJ4X4LYL provides a graduated ramp inside the junction body that guides fiber bundles from one channel orientation to another while preserving the minimum bend radius required by TIA-568 and manufacturer specifications. The 10.79-inch length and 12.07-inch width give ample room for trunk cables and pre-terminated assemblies to transition smoothly, and the 6.06-inch height accommodates stacked fiber trays or high-density MTP trunk breakouts. Mounting hardware integrates with Panduit's snap-lock channel system, so the junction seats flush against the existing runway without exposed fasteners or protruding edges that could snag cables during moves, adds, or changes.

Data center and central office builds under TIA-942 or Uptime Institute Tier III/IV standards require complete documentation of pathway fire ratings, seismic bracing, and bonding/grounding continuity. The FRSPJ4X4LYL's UL 2024 Listing provides the third-party verification inspectors expect, and its Telcordia GR-63-CORE Level 3 compliance confirms it has passed the earthquake simulation (seismic Zone 4 with 2.5g peak acceleration), temperature cycling (-40°C to +70°C), and humidity exposure protocols that define NEBS Level 3. Yellow color-coding aligns with standard practices in multi-tenant colocation facilities where each tenant's fiber infrastructure is identified by jacket color — integrators can match the junction to trunk cable color or use it as a high-visibility marker at critical pathway intersections. The polycarbonate/ABS blend resists the cleaning solvents and degreasers used during commissioning, and its impact resistance holds up under the accidental strikes that happen when techs maneuver equipment racks into position or run power whips overhead.

This junction ships individually packaged, ready for integration into Panduit FiberRunner systems across 4x4 through 24x4 channel sizes. Installers working on phased data hall builds can stock a common part number and deploy it across multiple pathway widths, reducing SKU proliferation and simplifying procurement. The no-alteration mount design means no field cutting, no debris cleanup, and no risk of damaging in-service fibers during retrofit installations — critical advantages when adding capacity to live production environments where a single fiber cut can take down an entire storage array or spine switch.