Middle Atlantic MPR-JB843A Junction Box

Designed for professional AV installations, the Middle Atlantic MPR-JB843A Junction Box delivers dependable cable management and durable protection for power and signal runs along MPR raceways. Built from sturdy steel and finished in a black powder coat, this junction box stands up to the demands of busy control rooms, studios, conference facilities, and high-traffic environments. Its rugged construction, pre-punched electrical knockouts, and seamless compatibility with the MPR system enable clean wiring paths, reduced installation time, and straightforward service. The MPR-JB843A is designed to blend into equipment racks and raceways while remaining accessible for maintenance, upgrades, or re-wiring projects. Whether you’re mounting a critical AV distribution network, rack-mounted gear, or a multi-source cable layout, this box keeps cables organized, protected, and compliant with industry standards.

• Sturdy steel construction with a durable black powder coat finish provides long-lasting protection against impact, abrasion, and environmental exposure in busy rack rooms and on-stage setups.
• Equipped with electrical knockouts: Pre-punched openings allow flexible routing for power, data, and video cables, enabling quick, code-compliant connections while maintaining neat interior cable management.
• End-of-raceway versatility: The optional J-box fits securely on the end of MPR raceways, helping you create seamless, uninterrupted cable runs from start to finish.
• Compatibility with MPR raceway systems: Specifically designed to integrate with Middle Atlantic’s MPR series, ensuring a secure fit and a consistent, professional aesthetic across installations.
• User-friendly installation and service: The compact enclosure is easy to mount to the raceway or adjacent surfaces with standard hardware, and provides straightforward access for cable pulls, terminations, and future upgrades.

Technical Details of Middle Atlantic MPR-JB843A

• Model: MPR-JB843A
• Product type: Junction Box
• Material: Steel
• Finish: Black powder coat
• Knockouts: Equipped with electrical knockouts
• Mounting: Optional J-box fits on end of MPR raceway
• Compatibility: Designed for use with Middle Atlantic MPR raceway systems
• Applications: Cable management and enclosure for AV, data, and power runs

How to install Middle Atlantic MPR-JB843A Junction Box

• Power down the system and verify that the installation site complies with local electrical codes before beginning work.
• Plan the cable routing to align knockout openings with your power, data, and AV needs; select appropriate knockout plugs or bushings if required.
• Position the junction box at the end of an MPR raceway (where applicable) and use the recommended mounting hardware to secure it firmly to the raceway or adjacent surface.
• Route cables through the chosen knockouts, ensuring there is enough slack for termination and future servicing; avoid pinching cables and maintain proper bend radii.
• Terminate cables as needed inside the box, seal knockouts as required by code or application, and tidy interior cabling with ties or restraints to preserve airflow and access.
• Perform a final check to confirm clearance, labeling, and accessibility for future maintenance or expansions; restore power and test for proper operation.

Frequently asked questions

• Q: What is the MPR-JB843A used for? A: It is a junction box designed to be used with Middle Atlantic MPR raceways to house and protect cables and terminations at the end of runs, providing a clean, professional enclosure for AV, data, and power cables.
• Q: Does the MPR-JB843A have knockouts? A: Yes. It is equipped with electrical knockouts to facilitate flexible cable routing and connections.
• Q: What finish does it have? A: The junction box features a durable black powder coat finish for rugged, professional aesthetics and resistance to wear.
• Q: Is the box compatible with other raceway systems? A: It is specifically designed for Middle Atlantic MPR raceway systems, ensuring optimal fit and appearance; compatibility with non-MPR systems is not guaranteed.