Jb Industries jb400 Open Splice Junction Box 4 in

Product Description

The JB INDUSTRIES jb400 is a one-piece open splice junction box designed to enclose exposed wire splices without requiring the electrician to disconnect or re-splice existing wiring. The hinged lid folds down over the splice and secures with four screws, bringing the installation up to code in minutes. Rated at 25.8 cubic inches of internal volume, the box is constructed from fire-resistant polymer and is UL Listed (UL 514C) in the United States and certified to CSA C22.2 182 in Canada. It is made in the USA and carries a patent-pending one-piece design.

The jb400 is suited for residential and light commercial electrical work where open wire splices exist in finished or hard-to-access spaces such as crawl spaces, attics, and wall cavities. Licensed electricians and experienced DIYers use it to resolve a common code violation — unenclosed wire splices — without re-pulling wire or rebuilding the splice from scratch. Entry slots are provided on all four sides of the box to accommodate existing wiring routing in any direction.

Key Features

• One-piece construction with hinged lid — no loose parts to manage in tight spaces
• 25.8 cubic inches of internal volume accommodates multiple conductors and connectors
• Fire-resistant polymer body rated to UL 514C and CSA C22.2 182
• Four-sided wiring entry slots allow wiring to enter from any direction
• No wire disconnection required — encloses the existing splice as-is
• Made in the USA

Compatibility

Designed as an OEM-style replacement and code-compliance solution for residential and light commercial open wire splice installations requiring an enclosed electrical junction box.

Installation Notes

Installation should be performed by a licensed electrician or a qualified individual familiar with NEC requirements for enclosed splices. Before enclosing the splice, inspect all wire connectors to confirm they are tight, undamaged, and properly mated — do not enclose a suspect connection. De-energize the circuit at the breaker panel and verify with a non-contact voltage tester before handling any conductors. Secure the lid with all four screws to ensure the enclosure meets code.

Technical Specifications

• Internal Volume: 25.8 cubic inches
• Size: 4 inches
• Material: Fire-resistant polymer
• Certifications: UL Listed (UL 514C), CSA C22.2 182
• Country of Origin: USA

Standard Information

• Brand: JB INDUSTRIES
• Manufacturer Part Number: jb400