Abb B520P-UPC Ceiling Electrical Box 20 Cu in Polycarbonate

Product Description

The ABB B520P-UPC is a 4/0 round ceiling electrical box designed for overhead fixture and device installations in residential and light commercial wiring applications. Molded from polycarbonate in a high-visibility blue finish, this box offers a volume of 20 cubic inches, meeting NEC fill requirements for most standard ceiling fixture and fan-support configurations. It ships with captive nails for direct attachment to wood framing, along with an attached ground lug and screw, eliminating the need to source separate grounding hardware. Licensed electricians and rough-in crews rely on this type of box for fast, code-compliant ceiling rough-ins.

This ceiling box is suited for residential new construction and renovation work where a round overhead box is required for light fixtures or fan-rated applications where the box itself carries the appropriate listing. The captive nail mounting system allows single-handed attachment directly to ceiling joists or wood nailers without additional fasteners. The 20 cubic inch interior volume provides adequate wire-fill capacity for typical branch circuit conductors and device connections at ceiling locations.

Key Features

• 20 cubic inch interior volume for NEC conductor fill compliance
• Polycarbonate construction — lightweight and non-conductive
• Captive nail mounting for direct attachment to wood framing members
• Includes pre-attached ground lug and screw — no separate grounding hardware needed
• Blue color for easy identification during rough-in inspection
• 4 inch diameter round profile fits standard ceiling fixture canopies

Compatibility

Designed as an OEM-style replacement or new-installation ceiling box compatible with standard 4 inch round ceiling fixture and device installations in wood-framed construction.

Installation Notes

Installation is performed by a licensed electrician in accordance with NEC Article 314 governing outlet box sizing and mounting. De-energize the branch circuit at the panel and verify absence of voltage before making any wiring connections. Drive captive nails fully into the framing member to achieve secure mechanical support prior to pulling wire. Do not exceed the rated cubic inch fill capacity when combining conductors, devices, and fittings inside the box.

Technical Specifications

• Volume: 20 cubic inches
• Diameter: 4 inches
• Depth: 2.25 inches
• Material: Polycarbonate
• Color: Blue
• Mounting: Captive Nails
• Included Hardware: Ground lug and screw attached
• UPC: 034481006220

Standard Information

• Brand: ABB
• Manufacturer Part Number: B520P-UPC