Thomas & Betts 8525-TB Insulated Set Screw Connector

Description:

The Thomas & Betts 8525-TB Insulated Set Screw Connector NSB is used to connect and effectively bond 1-1/2 inch rigid metal conduit (RMC) or intermediate metal conduit (IMC) to electrical boxes and enclosures without threading the conduit. Commonly installed in industrial facilities, manufacturing plants, commercial buildings, and utility electrical systems, this insulated connector provides a secure mechanical connection while protecting conductor insulation during installation. Maintenance teams and electrical contractors use this fitting for repair, retrofit, expansion, and replacement of rigid conduit systems. 

Applications:

The Thomas & Betts 8525-TB is designed for terminating 1-1/2 inch rigid metal conduit or IMC to threadless openings in electrical enclosures. Its nylon-insulated throat reduces conductor abrasion and wire pulling effort, while captive hex-head set screws provide positive mechanical retention and grounding continuity. The concrete-tight design makes it suitable for switchgear, motor control centers, industrial machinery, electrical distribution systems, and commercial conduit installations where conduit rotation is not possible. 

Technical Specifications:

• Manufacturer Part Number (MPN): 8525-TB
• Brand: Thomas & Betts (ABB) – T&B Rigid Fittings
• Product Type: Insulated Set Screw Connector
• Trade Size: 1-1/2 in.
• Conduit Type: Rigid Metal Conduit (RMC) / Intermediate Metal Conduit (IMC)
• Installation Type: Threadless Set Screw
• Connector Style: Straight
• Material: Steel
• Finish: Electro Zinc-Plated Chromate Coating
• Throat Type: Nylon Insulated
• Thread Length: 5/8 in.
• Overall Length: 2-5/16 in.
• Connection Type: External Threaded Connector
• Construction: Concrete-Tight
• Application: Connects and effectively bonds RMC/IMC to threadless openings in boxes and enclosures
• Standards: UL 514B (UL File E23018), CSA Certified, NEMA FB-1, NFPA 70
• Compliance: RoHS 3 Compliant, TSCA Section 6(h) Compliant
• UPC: 786210085258
• Features: Captive hex-head set screws, nylon insulated throat to reduce wire pulling effort, concrete-tight construction, corrosion-resistant steel body, positive grounding continuity, and eliminates the need for conduit threading.

Common Replacements:

• Thomas & Betts 8425-TB
• Thomas & Betts 8625
• Appleton SRNTC-150