Thomas & Betts 1-1/4 Inch Insulated Grounding Bushing with 14-4 Wire Range
Professional Electrical Grounding Solution with Malleable Iron Construction
The Thomas & Betts 1-1/4 inch insulated grounding bushing delivers reliable electrical grounding performance with malleable iron construction for durability and long-term service. This professional-grade grounding bushing accommodates 14-4 wire range applications, providing secure connections and proper grounding continuity in electrical installations.
Professional Features & Benefits
- 1-1/4 Inch Size: Provides proper fit for standard conduit applications with secure mounting and connection capability.
- 14-4 Wire Range Compatibility: Accommodates multiple wire gauges for versatile installation requirements and connection flexibility.
- Insulated Design: Ensures proper electrical isolation while maintaining grounding continuity for safe operation.
- Malleable Iron Construction: Delivers exceptional durability and corrosion resistance for long-term reliability in demanding environments.
- Professional Grounding Solution: Provides code-compliant grounding connections for electrical safety and system integrity.
- Thomas & Betts Quality: Engineered to meet professional electrical standards with consistent performance and reliability.
Technical Specifications
- Department: Electrical
- Material: Malleable Iron
- Number Of Batteries: 0
- Product Group: Miscellaneous
- Product Subgroup: Brushes
- Product Type: Grounding Bushings & Accessories
Professional Applications
- Commercial Electrical Installations
- Industrial Facility Grounding Systems
- Residential Electrical Service Panels
- Professional Electrical Contractor Projects
- Code-Compliant Grounding Applications
- Conduit System Installations
- Electrical Safety Upgrades
Why Choose Thomas & Betts Quality?
Thomas & Betts grounding bushings deliver professional-grade performance with malleable iron construction ensuring long-term durability and reliable electrical connections. Trust Thomas & Betts quality for consistent performance in critical electrical grounding applications.
Manufacturer Resources
Product Specs
- Product Subgroup:
- Grounding & Bonding
- Product Type:
- Grounding Bushing
- Product Group:
- Grounding & Bonding
- Department:
- Electrical
- Product Material:
- Malleable Iron
- Number Of Batteries:
- 0
Thomas & Betts 3873 – Frequently Asked Questions
1) What conduit sizes do the Thomas & Betts insulated grounding bushings come in?
Three trade sizes: 1-1/4 inch (part 3873), 1-1/2 inch (3874), and 2-1/2 inch (3876). Order by the trade size of the rigid or IMC conduit you are bushing, not by the wire size, since the bushing threads onto the conduit end.
2) What size grounding conductor can I land on a T&B 3873 or 3874 insulated grounding bushing?
The lay-in lug takes a 14 to 4 AWG range, so anything from a #14 equipment grounding conductor up to a #4 bonding jumper terminates directly. Larger than #4 and you need a different bushing or a separate bonding lug on the enclosure.
3) What does an insulated grounding bushing actually do that a plain bushing does not?
It does two jobs at once. The insulated throat protects conductor insulation where wires leave the conduit into a panel or box, and the integral lug gives you a point to bond the conduit run to the enclosure ground with a 14 to 4 AWG conductor. A plain insulated bushing only protects the wire; it gives you nowhere to land a bonding jumper.
4) Are these grounding bushings metal or plastic, and will they hold up in a damp industrial environment?
The body is malleable iron, so it is a metallic bushing with an insulating throat liner rather than an all-plastic fitting. Iron bodies are the usual choice for industrial and commercial conduit runs where a plastic bushing would be too fragile to torque down.
5) Do I need one grounding bushing per conduit entry when bonding a service panel?
Yes, one per conduit end you are bonding. Each bushing carries a single lug sized for 14 to 4 AWG, so a four-conduit entry into a panel takes four bushings, matched to each conduit's trade size (1-1/4, 1-1/2 or 2-1/2 inch here), plus the bonding jumpers.
6) Can I use these on EMT with a set-screw connector?
These are threaded grounding bushings, so they thread onto rigid or IMC conduit ends. For EMT you would bond with a grounding-type EMT connector or a grounding locknut instead, since EMT is not threaded.
7) Is a bonding jumper included with the T&B 3873 grounding bushing?
No. The bushing supplies the threaded body and the lug only; the grounding or bonding conductor is bought separately and sized to the job, anywhere in the 14 to 4 AWG range the lug accepts.
How fast can I get the Thomas & Betts 3873 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Thomas & Betts 3873 come with a warranty?
Absolutely. The Thomas & Betts 3873 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Thomas & Betts 3873?
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