1. Introduction
The CBI QB-50 is a robust quad duplex box designed for reliable AC power distribution in various settings. This unit features four AC outlets (eight receptacles total) and a 50-foot 12/3 hardwired power cable, prewired for 20 amp service. Constructed with high-quality Leviton components and 12 Gauge Black SJOOW wire, the QB-50 ensures performance and durability for demanding applications.
Image showing the CBI QB-50 Quad Duplex Box, featuring a durable cast enclosure with four AC outlets and the attached 50-foot power cable.
2. Important Safety Information
Please read and understand all safety instructions before operating this product. Failure to follow these instructions may result in electric shock, fire, or serious injury.
- Always inspect the power cable and box for any signs of damage (cuts, abrasions, kinks) before each use. Do not use if damaged.
- Do not exceed the maximum rated capacity of 20 amps for the entire unit. Overloading can cause overheating and fire.
- Ensure the power source is properly grounded and capable of supplying the required current.
- Do not expose the unit to water, rain, or excessive moisture. This product is not waterproof.
- Keep children and pets away from the unit during operation.
- Always unplug the unit from the power source when not in use or before cleaning.
- Do not attempt to open or modify the unit. There are no user-serviceable parts inside.
- Use only in well-ventilated areas to prevent heat buildup.
3. Package Contents
- 1 x CBI QB-50 Quad Duplex Box with 50ft 12/3 Hardwired Power Cable
4. Setup Instructions
- Uncoil the Cable: Completely uncoil the 50-foot power cable before connecting it to a power source. This prevents overheating and potential damage to the cable.
- Placement: Place the quad duplex box on a stable, dry, and non-conductive surface. Ensure it is away from foot traffic or areas where it could be tripped over or damaged.
- Connect to Power Source: Connect the male plug end of the 50ft power cable to a compatible 120V, 20 amp grounded power receptacle. Ensure the connection is secure.
- Verify Power Source: Confirm that the power source is capable of handling the total electrical load of all devices you intend to connect to the quad box.
5. Operating Instructions
- Power On: Once the main power cable is securely connected to a live power source, the four duplex outlets on the quad box are ready for use.
- Connect Devices: Plug your 120V AC devices into the available 15 amp outlets on the quad duplex box. Ensure plugs are fully inserted.
- Monitor Load: Do not overload the individual outlets or the entire unit. The total current draw of all connected devices must not exceed 20 amps.
- Disconnecting: To power down, first turn off and unplug all devices connected to the quad box. Then, safely disconnect the main power cable from the wall receptacle.
6. Care and Maintenance
- Inspection: Regularly inspect the entire unit, including the cable, plug, and outlets, for any signs of wear, damage, or loose connections.
- Cleaning: Disconnect the unit from power before cleaning. Wipe the exterior of the box with a dry, soft cloth. Do not use liquid cleaners, solvents, or abrasive materials.
- Storage: When not in use, coil the power cable neatly and store the unit in a cool, dry place, away from direct sunlight and extreme temperatures. Avoid kinking or sharply bending the cable.
- Cable Management: Avoid running the cable under carpets, through doorways, or near heat sources. Secure the cable to prevent tripping hazards.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power to outlets. | Main power source is off or tripped. Cable not fully plugged in. | Check the wall outlet or circuit breaker. Ensure the power cable is securely connected. |
| Unit or cable feels hot. | Overload. Cable is coiled or obstructed. | Immediately disconnect devices. Reduce the total load. Ensure the cable is fully uncoiled and has proper ventilation. |
| Loose connection with devices. | Plug not fully inserted. Outlet wear. | Ensure device plugs are firmly seated. If outlets are consistently loose, discontinue use and replace the unit. |
8. Specifications
| Model Number | QB-50 |
| Manufacturer | CBI |
| Cable Length | 50 feet (15.24 meters) |
| Wire Gauge | 12 Gauge SJOOW |
| Service Rating | 20 Amps |
| Outlets | 4 AC Duplex (8 receptacles total) |
| Voltage | 120 Volts |
| Plug Format | Type B (NEMA 5-15P compatible) |
| Color | Black |
9. Warranty and Support
For specific warranty information regarding your CBI QB-50 Quad Duplex Box, please refer to the documentation provided at the time of purchase or contact your authorized retailer. Keep your purchase receipt as proof of purchase for any warranty claims.
For technical support or inquiries, please contact the manufacturer, CBI, or your product supplier directly. Contact details are typically available on their official websites or product packaging.





