Middle Atlantic MPR-JB843A J-Box for MPR Modular Raceway System BRAND NEW The MPR-JB843A is a junction box (J-box) designed for the Middle Atlantic MPR modular power raceway system. It mounts to the end of an MPR raceway to enclose wiring connections and provide a clean termination point. Key details Type: Cable raceway junction box Material: Steel, black powder-coated finish Dimensions: ~8" (D) 4" (W) 3" (H) Features: Electrical knockouts for conduit/cable entry Attaches to MPR raceways (like MPR-3A, MPR-6A, MPR-8A, etc.) Used in configurable rack power distribution setups What it?s used for Terminating power or low-voltage wiring in AV/server racks Adding a code-compliant enclosure at the end of a raceway Keeping cable routing organized and protected SHELF: 86 SA