Nsi Industries 249 4 Inch Set Screw Coupling

Product Description

The NSI INDUSTRIES 249 is a 4-inch set screw coupling designed to join two sections of electrical conduit in a secure, reliable connection. This fitting uses a set screw fastening method to mechanically lock conduit sections together without the need for threading, making installation straightforward in both new construction and retrofit applications. Licensed electricians and electrical contractors install this type of coupling as part of a conduit raceway system to maintain continuous wiring protection. The 249 is sized for 4-inch conduit, making it well suited for larger feeder runs and service entrance installations.

This coupling is used in commercial and industrial electrical installations where 4-inch conduit systems route high-capacity circuits, feeders, or service conductors. It is appropriate for use in exposed or concealed conduit runs where a mechanically secure joint is required. The set screw design allows for fast assembly during rough-in work and is commonly used by electricians working to NEC raceway installation standards. The fitting is a standard component in conduit system assemblies across a wide range of building types.

Key Features

• 4-inch trade size accommodates large-diameter conduit runs for feeder and service applications
• Set screw fastening mechanism provides a secure mechanical connection without threading
• Straightforward installation reduces assembly time during conduit rough-in
• Compatible with standard 4-inch conduit sections used in commercial and industrial wiring

Compatibility

Designed as an OEM-style replacement and standard fitting for 4-inch electrical conduit raceway systems in commercial and industrial applications.

Installation Notes

Installation should be performed by a licensed electrician in accordance with applicable NEC requirements for conduit raceway systems. De-energize all circuits in the conduit run before beginning any work on the raceway system. A set screw driver or hex key is typically required to tighten the set screw fastener to a secure fit. Ensure conduit ends are clean and properly deburred before inserting them into the coupling to maintain a smooth interior surface for wire pulling.

Technical Specifications

• Trade Size: 4 inches
• Connection Type: Set Screw
• UPC: 78174700249

Standard Information

• Brand: NSI INDUSTRIES
• Manufacturer Part Number: 249