Thomas & Betts 8821 Threadless Conduit Connector NSB

Description:

The Thomas & Betts 8821 Threadless Connector NSB is used to connect and effectively bond 3 inch rigid metal conduit (RMC) or intermediate metal conduit (IMC) to electrical boxes and enclosures without requiring conduit threads. Commonly installed in industrial facilities, manufacturing plants, commercial buildings, utility installations, and electrical distribution systems, this threadless connector provides a secure mechanical connection and reliable grounding continuity. Maintenance teams and electrical contractors use this fitting for repair, retrofit, expansion, and replacement of rigid conduit installations. 

Applications:

The Thomas & Betts 8821 is designed to terminate or couple 3 inch threadless rigid metal conduit and IMC in electrical raceway systems. Its malleable iron body and split case-hardened steel ring with diagonal serrations provide a permanent, concrete-tight connection while ensuring positive electrical bonding. The connector is ideal for switchgear, motor control centers, industrial machinery, panelboards, process equipment, and commercial electrical installations where conduit threading is impractical or unnecessary. 

Technical Specifications:

• Manufacturer Part Number (MPN): 8821
• Brand: Thomas & Betts (ABB) – T&B Rigid Fittings
• Product Type: Threadless Connector
• Trade Size: 3 in.
• Conduit Type: Rigid Metal Conduit (RMC) / Intermediate Metal Conduit (IMC)
• Connection Type: Threadless
• Throat Type: Non-Insulated
• Material: Malleable Iron Body with Case-Hardened Steel Ring, Gland, Locknut, and Nut
• Finish: Electro Zinc-Plated Chromate Coating
• Overall Length: 4 in.
• Outside Diameter: 4-7/8 in.
• Thread Length: 1-7/32 in.
• Construction: Concrete-Tight
• Application: Connects and effectively bonds threadless RMC/IMC to electrical boxes and enclosures or couples threadless conduit sections
• Standards: UL 514B (UL File E23018), CSA Certified, Federal Specification WF-408, NEMA, NFPA 70
• Compliance: RoHS 3 Compliant, TSCA Section 6(h) Compliant
• UPC: 786210088211
• ETIM Classification: EC001492 – Coupler for Cable Protection Tube
• Features: Split steel ring with diagonal serrations for positive grounding, permanent mechanical connection, eliminates conduit threading, corrosion-resistant construction, and approved for concrete-tight installations.

Common Replacements:

• Thomas & Betts 8721
• Thomas & Betts 8921
• Appleton TTC-300