Bosch CONDUIT BACK BOX 148MM - NDA-U-CBB

Bosch NDA-U-CBB Conduit Back Box, 148mm

Overview

The Bosch NDA-U-CBB is an aluminum conduit back box engineered as a structural foundation for compatible Bosch dome camera installations where conduit entry, impact resistance, and long-term outdoor durability are non-negotiable. At 151.14 mm diameter and 46.20 mm in height, this back box sits flush between the mounting surface and the camera head, channeling conduit wiring cleanly through a single M25-threaded entry point while providing a rigid, tamper-resistant base. If you are specifying a Bosch surveillance dome installation in a transit facility, parking structure, or any environment where the mount itself may take mechanical abuse, the NDA-U-CBB is the back box to spec.

Cast from aluminum and finished in RAL 9003 signal white, the NDA-U-CBB (often searched as NDA U CBB) is built to the same environmental standards as the cameras it supports — IK10 impact resistance, salt-mist endurance per IEC 60068-2-52, and vibration and shock compliance per IEC 60068-2-6 and IEC 60068-2-27 with NEMA TS2 alignment. That is not incidental spec padding; it means the back box survives the same loading conditions the camera body itself must pass, keeping the installation structurally sound as a unit.

Key Features

• IK10 Impact Rating: IK10 is the highest rating on the IEC 62262 vandal-resistance scale, meaning the housing withstands a 20-joule impact — equivalent to a 5 kg mass dropped from 400 mm. In transit hubs, stairwells, or public-access corridors, this means the back box will not deform or crack from incidental or deliberate strikes that would compromise a standard junction box.
• Aluminum Construction: Die-cast aluminum provides a rigid, non-corroding shell that handles outdoor temperature cycling without the warping or brittleness you get from polymer housings over time. The 467 g (1.03 lb) weight reflects the material density — substantial enough to confirm genuine cast aluminum, light enough for single-person overhead installation.
• M25 Maximum Conduit Entry: The M25-rated conduit opening handles the conduit sizes used in most commercial EMT and rigid conduit runs, allowing a clean, code-compliant conduit stub-up without adapters. If your installation uses smaller conduit, standard reducing bushings handle the transition.
• RAL 9003 Signal White Finish: Signal white matches the majority of Bosch dome camera housings, producing a visually unified, professional install on white ceilings and soffits. Repainting is straightforward if the installation environment uses a different color standard — aluminum accepts paint adhesion reliably.
• Salt-Mist Resistance (IEC 60068-2-52): Salt-mist testing per IEC 60068-2-52 confirms the finish and substrate will not corrode under coastal or industrial chemical-spray environments. This matters in parking garages with winter road-salt exposure, marine terminal buildings, or food-production facilities with wash-down proximity.
• Vibration and Shock Compliance (IEC 60068-2-6, IEC 60068-2-27, NEMA TS2): NEMA TS2 is the traffic-signal and transportation-infrastructure vibration standard. A back box rated to NEMA TS2 vibration tolerates continuous structural vibration from HVAC, heavy vehicle traffic, or industrial equipment without loosening its fastener interface — directly relevant for bridge-mounted, garage-ceiling, or factory-floor installations on surveillance mounts subject to ongoing vibration loading.
• Compact Form Factor (151.14 mm Ø × 46.20 mm H): The 46.20 mm mounting depth fits within standard ceiling cavity depths and keeps the camera's finished ceiling protrusion minimal — an important consideration in low-clearance suspended-ceiling installations where every millimeter of standoff height affects aesthetics and contractor compliance with space constraints.

Integration & Compatibility

The NDA-U-CBB is designed for use within the Bosch Security Systems dome camera mounting ecosystem. Verify compatibility with your specific camera model against Bosch's current mounting compatibility matrix — back-box fit dimensions, screw patterns, and conduit routing align to Bosch's modular dome platform. The M25 conduit entry is a metric thread; imperial conduit installations using ¾-inch EMT will require an M25-to-¾-inch conduit adapter at the back box entry. When specifying for new construction, coordinate the stub-up conduit size with your conduit plan early — the M25 maximum is a hard limit and does not accommodate larger conduit without a separate junction box in line. For installations requiring outdoor IP camera deployments, pair the NDA-U-CBB with the appropriate Bosch pendant or surface-mount adapter for your camera model to complete the assembly. Review your PoE switch placement and conduit routing plan before committing the rough-in location — repositioning a conduit stub-up after concrete or drywall close-in is a costly change order.

Frequently Asked Questions

Q: What is the maximum conduit size the NDA-U-CBB accepts?

A: The NDA-U-CBB accepts a maximum conduit diameter of M25 (metric thread). Installations using smaller conduit require a standard reducing bushing. Larger conduit cannot be accommodated at the back box entry directly.

Q: What is the impact resistance rating of the NDA-U-CBB?

A: The NDA-U-CBB carries an IK10 rating per IEC 62262, the highest level on the vandal-resistance scale, corresponding to a 20-joule impact resistance. This makes it appropriate for public-access, transit, and high-traffic environments where the mount may be subject to physical impact.

Q: Is the NDA-U-CBB suitable for coastal or industrial environments?

A: Yes. The back box has been tested to IEC 60068-2-52 for salt-mist resistance, confirming the finish and aluminum substrate can withstand corrosive environments including coastal installations and facilities with chemical spray or wash-down proximity.

Q: What are the physical dimensions and weight of the NDA-U-CBB?

A: The NDA-U-CBB measures 151.14 mm in diameter by 46.20 mm in height, and weighs 467 g (1.03 lb). The 46.20 mm depth is compatible with most standard ceiling cavity installations without additional clearance modifications.

Q: Does the NDA-U-CBB meet transportation infrastructure vibration standards?

A: Yes. The NDA-U-CBB is tested to IEC 60068-2-6 and IEC 60068-2-27 for vibration and shock, with alignment to NEMA TS2 — the standard used for traffic-signal and transportation infrastructure equipment. This makes it appropriate for bridge-mounted, parking structure, or traffic-adjacent installations subject to continuous vibration loading.

Q: What color is the NDA-U-CBB, and can it be painted?

A: The NDA-U-CBB is finished in RAL 9003 signal white. The aluminum construction accepts paint adhesion reliably if the installation environment requires a different finish color.

Marty Allison

The spec that stands out to me on the NDA-U-CBB is the IK10 impact rating combined with a NEMA TS2 vibration profile — most back boxes in this form factor are specified to one or the other, not both. That combination is what makes this the correct rough-in component when you are putting a dome camera in a transit environment or a parking structure where both vibration and physical strike risk are real, not theoretical.

Technical Highlights:

• IK10 Impact Resistance: 20-joule rated per IEC 62262 — the back box holds structural integrity under the same strike force that would crack a standard polymer junction box, protecting conduit terminations and wiring from mechanical damage in vandal-risk zones.
• NEMA TS2 / IEC 60068-2-6 Vibration: Tested to the same vibration standard used for traffic-control hardware; continuous vibration from vehicle traffic, HVAC equipment, or industrial machinery will not work fasteners loose or fatigue the housing over a multi-year service life.
• Salt-Mist per IEC 60068-2-52: The aluminum substrate and finish pass salt-mist endurance testing, which means corrosion-driven failure in coastal, de-icing salt, or chemical-wash environments is not a scheduled maintenance concern — unlike zinc-alloy or steel back boxes that require periodic inspection in those conditions.

Deployment Considerations:

• The M25 maximum conduit entry is a metric thread — confirm your conduit spec at the design stage. Adapting ¾-inch imperial EMT to M25 is straightforward with a bushing, but it is a procurement step that gets missed on mixed metric/imperial sites and causes field delays.
• At 46.20 mm in height, the NDA-U-CBB adds just under 50 mm of standoff to the camera assembly's finished ceiling protrusion — factor this into low-clearance ceiling designs, particularly in suspended-ceiling retrofits where the T-bar grid limits available space above the tile plane.

For a transit station, multi-level parking structure, or bridge-toll installation where the camera mount will live for 10-plus years in a high-vibration, salt-exposed environment, the NDA-U-CBB is the correct rough-in specification — not a commodity back box that meets one standard and ignores the others.