Choosing the right grounding hub is essential for electrical safety and compliance in any conduit installation. This guide highlights top grounding hubs and related fittings designed to secure and ground conductors while protecting against moisture, abrasion, and corrosion. The selections below cover bronze, insulated, watertight, and rigid options to fit a range of conduit sizes and environments.
| Product | Brand | Conduit Size | Key Features | Amazon Link |
|---|---|---|---|---|
| COREX 3/4″ Bronze Threaded Conduit Grounding Hub | COREX | 3/4″ | 360° swing/swivel, bronze construction, wire range #10 thru #20 | https://www.amazon.com/dp/B08V99X934?tag=electricalgree-20 |
| COREX 1″ Bronze Threaded Conduit Grounding Hub | COREX | 1″ | 360° swing/swivel, bronze construction, wire range #10 thru #30 | https://www.amazon.com/dp/B08V99G212?tag=electricalgree-20 |
| Leviton Watertight Conduit Hub, 2-Inch, HUB-200 | Leviton | 2″ | Watertight seal, threaded connection, die-cast zinc, insulated throats | https://www.amazon.com/dp/B0055D5NWW?tag=electricalgree-20 |
| COREX Watertight Conduit Hub with Ground, 1-1/2″ | COREX | 1-1/2″ | Insulated, threaded, UL-Listed, ground bonding tab | https://www.amazon.com/dp/B0CZ7FNX7F?tag=electricalgree-20 |
| Sigma Engineered Solutions ProConnex 43382 Rigid Insulated Grounding Bushing 3/4″ | Sigma Engineered Solutions | 3/4″ | Lay-in lug grounding, smooth surface for pulling, #14 – #4 wires | https://www.amazon.com/dp/B00C3YCF8Q?tag=electricalgree-20 |
COREX 3/4″ Bronze Threaded Conduit Grounding Hub
COREX offers a robust 3/4″ bronze threaded conduit grounding hub designed for secure grounding with a 360-degree swing/swivel type hub. This unit accommodates wire ranges from #10 through #20, enabling flexible conductor routing while maintaining a solid ground path. Bronze construction provides corrosion resistance in harsh environments, making it suitable for outdoor or damp locations where grounding reliability matters.
COREX 1″ Bronze Threaded Conduit Grounding Hub
This 1″ bronze grounding hub from COREX provides a 360-degree swivel design for easy alignment and secure grounding connections. It supports a wider wire range from #10 through #30, enabling more versatile conductor configurations in commercial or industrial conduit runs. Bronze offers long-term durability and resistance to corrosion in challenging environments.
Leviton Watertight Conduit Hub, 2-Inch, HUB-200
Leviton HUB-200 provides a watertight solution for 2″ conduit systems with die-cast zinc construction and threaded connections. It features insulated throats to prevent wire abrasion and an embedded O-ring for a reliable, watertight seal in wet or humid environments. This hub is well-suited for outdoor installations or damp interiors where moisture control is critical.
COREX Watertight Conduit Hub with Ground, 1-1/2″
COREX’s 1-1/2″ watertight conduit hub includes a grounding option with a bonding tab and screw. The insulator is rated to 194°F (90°C), and the unit is UL-listed, meeting multiple NEMA requirements (2, 3, 3R, 4, 5, and 12). It is designed to perform reliably in wet environments while maintaining a secure ground path for connected conductors.
Sigma Engineered Solutions ProConnex 43382 3/4″ Grounding Bushing
The Sigma ProConnex 43382 grounding bushing provides a smooth surface to protect wires during pulling, plus a lay-in lug for easy grounding wire attachment. It is designed for 3/4″ rigid conduit or IMC, with a wire range from #14 to #4, making it suitable for modest-sized installations that require reliable grounding and protection.
Buying Guide: Key Purchase Considerations
When selecting grounding hubs for conduit systems, consider the following factors to ensure the right fit for your project:
- Conduit size and type: Verify trade size (1/2″, 3/4″, 1″, 1-1/2″, 2″, etc.) and whether the hub is rated for IMC, Rigid, or conduit material.
- Grounding method: Look for bonding tabs, screws, and lay-in lugs if you need a straightforward ground connection to the conductor.
- Insulation and seals: For outdoor or wet locations, select watertight hubs with O-rings and insulated throats to prevent wire abrasion and moisture intrusion.
- Material durability: Bronze and zinc alloys offer corrosion resistance; choose based on environmental exposure and long-term reliability.
- UL/NEMA compliance: Ensure the hub complies with applicable standards and building codes (UL-listed, meets NEMA requirements) for safety and inspection approvals.
- Heat resistance: Insulators rated to higher temperatures are preferable in areas with elevated ambient temperatures or where hot surfaces are present.
- Ease of installation: Swivel or swing-type hubs can simplify alignment, while seamless threading reduces installation steps.
Comparison at a Glance
- Bronze threaded hubs (COREX 3/4″ and 1″) offer strong grounding and corrosion resistance for standard indoor or outdoor conduit runs.
- Watertight hubs (Leviton HUB-200, COREX 1-1/2″ and 2″ models) provide moisture protection and reliable seals for wet or outdoor environments.
- Grounding bushings (Sigma ProConnex 43382 and 43386) focus on protecting wires during pulling and simplifying grounding connections in rigid conduit systems.
These options cover common installation scenarios, from indoor dry locations to outdoor wet environments, helping electricians select a grounding hub that balances durability, ease of use, and code compliance.