Thomas Betts 257 Fmc Conduit Connector 1-1/4 Inch

Product Description

The THOMAS BETTS 257 is a straight, non-insulated conduit connector designed for use with flexible metal conduit (FMC). Made from malleable iron, it uses a squeeze clamp connection method to secure FMC to an enclosure, panel, or junction box knockout. The 257 carries a 1-1/4 inch trade size rating and is listed for use in hazardous locations, making it suitable for industrial and commercial electrical installations where code-compliant FMC termination is required. Licensed electricians and electrical contractors are the primary installers of this fitting.

This connector is intended for straight-entry FMC terminations in both commercial and industrial environments. Its hazardous location rating extends its use to classified areas such as manufacturing facilities, chemical processing areas, and similar environments where conduit fittings must meet more stringent application requirements. The squeeze clamp design allows for fast, toolless FMC engagement at the connector body before tightening the clamp screw to secure the conduit end.

Key Features

• Malleable iron construction provides durability and resistance to mechanical stress
• Squeeze clamp connection method secures FMC without additional fittings or adapters
• Straight connector shape for direct, in-line FMC-to-enclosure entry
• Non-insulated design for standard grounding pathway applications
• Rated for hazardous location use in commercial and industrial applications
• 1-1/4 inch trade size fits standard FMC of matching diameter

Compatibility

Designed as an OEM-style replacement or new-installation fitting for 1-1/4 inch trade size flexible metal conduit (FMC) terminations in standard and hazardous location electrical enclosures and panels.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and any applicable local codes. De-energize and lock out the electrical panel or enclosure before beginning conduit connector installation. Ensure the FMC end is cleanly cut and fully seated into the connector body before tightening the squeeze clamp screw. Verify that the fitting trade size matches the FMC trade size before installation.