Thomas & Betts TB677 Threaded Conduit Coupling

Description:

The Thomas & Betts TB677 Erickson® Threaded Conduit Coupling is used to join and effectively bond 1-inch rigid metal conduit (RMC) or intermediate metal conduit (IMC) where neither conduit section can be rotated during installation. Commonly installed in industrial facilities, commercial buildings, utility infrastructure, and electrical distribution systems, this three-piece coupling features a malleable iron body with a steel center ring to provide a secure, concrete-tight connection and dependable grounding. Electricians, maintenance technicians, and contractors use this coupling for new installations, retrofits, repairs, and replacement of threaded conduit connections.

Applications:

The Thomas & Betts TB677 is designed for joining threaded ends of rigid metal conduit and IMC without rotating either conduit section. It is ideal for electrical raceways in manufacturing plants, commercial buildings, substations, utility installations, and other industrial environments where a strong mechanical connection and reliable electrical continuity are required.

Technical Specifications:

• Manufacturer Part Number (MPN): TB677 / 677
• Brand: Thomas & Betts (ABB) – Erickson®
• Product Type: Threaded Erickson Conduit Coupling (3-Piece)
• Trade Size: 1 in.
• Conduit Compatibility: Rigid Metal Conduit (RMC) and Intermediate Metal Conduit (IMC)
• Connection Type: Threaded
• Construction: Three-Piece Coupling with Steel and Malleable Iron Center Ring
• Material: Malleable Iron Body with Steel/Malleable Iron Ring
• Finish: Zinc Electroplated Chromate-Coated
• Outside Diameter: 1-29/32 in.
• Length: 1-5/8 in.
• Installation: Allows coupling where neither conduit length can be rotated
• Grounding: Provides high-quality electrical bonding and grounding continuity
• Construction Rating: Concrete-Tight
• Standards: UL Listed (UL E23018), CSA Certified
• Features: Free-fitting threads, vibration-resistant connection, high mechanical strength, suitable for carrying ground fault currents in accordance with product ratings
• Typical Applications: Industrial Plants, Commercial Buildings, Utility Installations, Manufacturing Facilities, Electrical Distribution Systems, Rigid Conduit Installations

Common Replacements:

• Thomas & Betts TB676
• Thomas & Betts TB678
• Thomas & Betts TB679