You may also like
Crouse-Hinds Zinc Die Cast Insulated Throat Grounding Bushing
Model: CRS-GLLDC
Crouse-Hinds Zinc Die Cast Insulated Throat Grounding BushingProfessional electrical grounding solution for secure conduit connectionsThe Crouse-Hinds Zinc Die Cast Insulated Throat Grounding Bushing...
Crouse-Hinds
Starting at
$17.19
Topaz Lighting 334 Insulated Zinc Die-Cast Grounding Bushing, Aluminum Lay-In Lug
Topaz Lighting's Insulated Zinc Die-Cast Grounding Bushing is engineered for reliable conduit service termination, featuring an integrated aluminum lay-in grounding lug for secure, code-compliant connections. Constructed from durable zinc die-cast metal, this bushing is recommended for use with copper or aluminum bare ground conductors and is available in trade sizes 1-1/4" and 3". A protective thermoplastic throat liner, rated to 105°C, safeguards wire insulation during installation and throughout the life of the installation, and the model is UL Listed for professional confidence.
Key Features
- Trade Size: Available in 1-1/4" and 3" trade sizes for compatibility with conduit service applications.
- Durable Construction: Zinc die-cast body delivers exceptional strength and long-term durability in demanding electrical environments.
- Aluminum Lay-In Grounding Lug: Integrated aluminum lay-in lug simplifies grounding conductor termination and ensures a secure, low-resistance ground connection.
- Insulated Thermoplastic Throat Liner: Protective thermoplastic throat liner rated to 105°C prevents wire insulation damage and maintains conductor integrity.
- Conductor Compatibility: Recommended for use with copper or aluminum bare ground conductors, offering broad compatibility for service entrance and feeder applications.
- UL Listed: Carries UL Listing, confirming compliance with applicable safety standards for professional electrical installations.
Certifications & Compliance
- UL Listed
- Thermoplastic throat liner rated to 105°C
- Compatible with copper and aluminum bare ground conductors
Technical Specifications
- Refer to manufacturer documentation for complete technical specifications.
Typical Applications
- Conduit service entrance terminations in commercial and industrial installations
- Grounding conductor termination with copper or aluminum bare ground connectors
- Panelboard, switchboard, and load center conduit connections
- New construction and renovation electrical raceway systems
- Applications requiring insulated throat protection for wire insulation integrity
- Grounding bushing installations in 1-1/4" and 3" trade sizes
Why Topaz Lighting?
Topaz Lighting's Insulated Zinc Die-Cast Grounding Bushing is built to last, combining rugged zinc die-cast construction with a thermoplastic throat liner rated to 105°C for reliable performance in demanding service conditions. UL Listed and compatible with both copper and aluminum bare ground conductors, this bushing delivers the code-compliant reliability that professional electricians and contractors depend on for conduit grounding. Topaz Lighting keeps this grounding bushing stocked in 1-1/4" and 3" trade sizes at ZenSupply, helping minimize project delays and keep installation work on schedule.
Manufacturer Resources
Spec Sheet
Product Specs
- Product Type:
- Grounding Bushing
- Listing:
- UL Listed
- Department:
- Electrical
- Product Group:
- Grounding & Bonding
- Product Subgroup:
- Grounding & Bonding
- Product Material:
- Zinc Die-Cast
- Product Size:
- 1-1/4" - 3"
Topaz Lighting TOP-338 – Frequently Asked Questions
1) What trade sizes does the Topaz 334 grounding bushing come in?
Two trade sizes: 1-1/4 inch, which is the 334, and 3 inch, ordered as part number 338. If your conduit run is anything between those, this pairing won't cover it, so match the trade size of the rigid or IMC conduit thread you are terminating before ordering.
2) Can I land an aluminum ground conductor in this Topaz bushing, or is it copper only?
Both. The lay-in lug is aluminum and is rated for copper or aluminum bare ground conductors, so it works for either without a separate transition connector.
3) Is a grounding bushing with an insulated throat required, or should I just use a plain insulated bushing?
They do different jobs. A plain insulated bushing only protects conductor insulation at the conduit end. The Topaz 334 does both: a thermoplastic throat liner rated to 105 C guards the wire insulation, and the integral aluminum lay-in lug gives you a point to bond the raceway with a ground conductor. If the raceway needs to be bonded, such as at a service entrance or where concentric knockouts break the bonding path, you want the grounding type.
4) Is the Topaz 334 grounding bushing UL Listed for inspection sign-off?
Yes, it carries a UL Listing. That is usually what an inspector looks for on a bonding bushing at a service or feeder termination.
5) Do I need a separate lug to bond the raceway with this bushing?
No separate lug. The grounding lug is built into the bushing and is a lay-in style, so you drop the bare ground conductor into the lug and tighten rather than threading it through a hole. You still supply the ground conductor itself.
6) What is the Topaz 334 bushing body made of, and will it hold up in an industrial panel room?
The body is zinc die-cast, which is the standard material for service-duty grounding bushings and holds thread engagement and lug torque better than a molded plastic bushing. The only non-metallic part is the thermoplastic throat liner, rated to 105 C.
7) Where is a Topaz insulated grounding bushing typically used on a commercial job?
Conduit terminations at panelboards, switchboards and load centers, and service entrance and feeder terminations where the raceway has to be bonded and the conductor insulation protected at the same time. Common on both new construction and renovation raceway work.
How fast can I get the Topaz Lighting TOP-338 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 Topaz Lighting TOP-338 come with a warranty?
Absolutely. The Topaz Lighting TOP-338 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 Topaz Lighting TOP-338?
You can call, text, or email our expert support team for fast answers. We’re here to help with
product
selection,
installation tips, and troubleshooting. Contact Us
Why buy the Topaz Lighting TOP-338 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.