Nsi Industries 259 Steel Compression Connector 4 Inch

Product Description

The NSI INDUSTRIES 259 is a 4-inch steel compression connector designed to secure electrical conduit to enclosures, panels, and junction boxes. This type of fitting creates a firm mechanical connection between rigid or IMC conduit and the entry knockout of an electrical enclosure. It is used in commercial and industrial electrical installations where a code-compliant, secure conduit termination is required. Licensed electricians install this fitting during rough-in and panel work, relying on the compression design to maintain a tight, rattle-free connection that meets wiring method requirements.

The NSI INDUSTRIES 259 is suited for use in commercial construction, industrial facilities, and large residential service work where 4-inch conduit runs terminate at enclosures or distribution equipment. The compression-style design is a common requirement in installations governed by the National Electrical Code, particularly where secure mechanical attachment and continuous ground path integrity are priorities. This connector is installed by licensed electricians and electrical contractors working on conduit systems requiring robust, durable fittings.

Key Features

• 4-inch trade size fits standard 4-inch rigid or IMC conduit knockouts
• Steel construction provides durability and mechanical strength at conduit termination points
• Compression-style design delivers a secure, tight fit without loosening over time
• Compatible with standard knockout openings on enclosures, panels, and junction boxes

Compatibility

Designed as an OEM-style replacement and standard-use compression connector for 4-inch conduit terminations at electrical enclosures and panels.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize all circuits and lock out the panel or enclosure before beginning work. Use appropriate conduit wrenches or pliers to tighten the compression nut to a firm, secure fit without over-tightening, which could damage the fitting or conduit. Verify the connection maintains continuity for the equipment grounding conductor path before restoring power.

Technical Specifications

• Trade Size: 4 inches
• Material: Steel
• Connection Type: Compression
• UPC: 78174700259

Standard Information

• Brand: NSI INDUSTRIES
• Manufacturer Part Number: 259