Best split grounding bushings for conduit prioritize easy installation, reliable grounding, and compatibility with common conduit sizes. This guide highlights five solid options suitable for a range of wiring projects, from pre-pull setups to post-pull adjustments. Ideal buyers include electricians, contractors, and facility maintenance teams seeking durable zinc-aluminum bushings with adjustable lugs. The table below summarizes the five picks and why they stand out.
| Product | Brand | Size | Why Chosen |
|---|---|---|---|
| Bridgeport SGB-384CL | BRIDGEPORT FITT | 1-1/4 in | Solid for 1-1/4″ conduits; durable zinc casting and insulated grounding lug. |
| Bridgeport Mighty-Rite SGB-385CL | Bridgeport | 1-1/2 in | Adjustable lug accepts larger conductors; post-pull flexibility. |
| COREX 2″ Insulated Split Grounding Bushing | COREX | 2 in | Thermoplastic insulated bushing; easy lay-in lug adjustments. |
| COREX 1/2″ Insulated Split Grounding Bushing | COREX | 1/2 in | Compact option; strong die cast zinc construction and adjustable lug. |
| COREX 2 1/2″ Insulated Split Grounding Bushing | COREX | 2-1/2 in | Large-size option with adjustable lug for bigger cable runs. |
Bridgeport SGB-384CL Die Cast Zinc Insulated Grounding Split Bushing
The SGB-384CL is a 1-1/4 inch insulated grounding split bushing with a zinc die-cast body. It is designed for reliable grounding in a compact form. Best for projects needing a sturdy, simple-to-install grounding solution without extra rework. Suitable for electrical panels and service entrances where 1-1/4 in conduits are common. Caution: limited to the 1-1/4 inch size—not ideal for larger conduit runs.
Bridgeport Mighty-Rite SGB-385CL Split Grounding Bushing
Capable of 4-1/0 AWG AC cable and 1-1/2 inch trade size, the SGB-385CL offers adjustable grounding lug design for easier wire alignment, both before and after wire pull. It supports convenient repositioning in tight spaces due to a hinged design. Best for larger conductor work or situations needing late-stage grounding adjustments. Limitation: heavier due to larger size; may require more space in crowded panels.
COREX 2″ Insulated Split Grounding Bushing
COREX 2″ insulated split grounding bushing features die-cast zinc construction with a thermoplastic insulated bushing rated to 150°C and an aluminum lay-in lug for straightforward adjustments. Best for mid-to-large conduit runs where a robust, thermally rated bushing is advantageous. Choose this if you need a reliable 2-inch solution and easy lug adjustments.
COREX 1/2″ Insulated Split Grounding Bushing
This COREX 1/2″ model provides a compact option with an adjustable lay-in lug and zinc die-cast body. Best for small-diameter conduit runs or service panels with space constraints. It is a solid choice when a small, dependable grounding bushing is required. Limitation: may not accommodate larger wires or heavy-duty installations.
Bridgeport SGB-387CL Die Cast Zinc Insulated Grounding Split Bushing
The SGB-387CL is a 2-1/2 inch insulated grounding split bushing with a zinc die-cast body. Best for large-diameter conduit runs and systems requiring a robust grounding solution in a single piece. It supports a wide range of conductor sizes. Caution: larger footprint may limit placement in compact panels.
COREX 1 1/4″ Insulated Split Grounding Bushing
COREX 1 1/4″ insulated split grounding bushing offers a balanced option between size and ease of handling, with a thermoplastic insulated bushing rated to 150°C and an adjustable lay-in lug. Best for mid-range conduit projects requiring reliable grounding with easy wire adjustments. Limitation: not ideal for very small or extremely large conduit sizes.
Buying Guide: Practical Considerations for Split Grounding Bushings
What size conduit do you need to cover? Select a model that matches the conduit diameter, but also consider availability for adjacent sizes if you anticipate future work. For pre-pull installations, prefer bushings with hinged or adjustable lugs to simplify alignment. For post-pull scenarios, look for easier access and lug adjustability that accommodates larger wires without rework. Material durability matters; die-cast zinc is common for strength, while thermoplastic insulation adds temperature resistance.
How important is temperature rating? If the environment experiences high ambient temperatures or space heaters, a bushing rated to 150°C offers additional safety and longevity. Are copper or aluminum conductors expected? Dual-rated Cu/Al compatibility expands the range of possible cables and reduces the need for different fittings. Consider whether you need a larger or smaller size than current work to future-proof your setup.
Key buyer questions
- What is the conduit size I am working with, and which bushing size matches it?
- Do I need adjustable lug features for easier later modifications?
- Is there a need for a high temperature rating to ensure long-term reliability?
- Should I prefer die-cast zinc for durability or thermoplastic insulated bushings for thermal performance?
Quick comparison: pick-by-use
- Best for small conduits: COREX 1/2″ or Bridgeport SGB-384CL
- Best for larger conductor runs: Bridgeport SGB-385CL or SGB-387CL
- Best for mid-size, adjustable lug needs: COREX 2″ and COREX 1 1/4″
Notes on data interpretation
Product details reflect each listing’s stated features, sizes, and design intentions. No claims about ratings, warranties, or third-party testing are included. Selection guidance is based on stated construction, adjustability, and typical use cases for conduit grounding bushings.
FAQ
- What is a split grounding bushing used for in conduit systems? Answer: It provides a secure ground path for conductors within conduit and eases wire installation by allowing easier alignment through a hinged or adjustable lug design.
- Why choose a larger size bushing? Answer: Larger bushings support bigger conductors and can simplify post-pull grounding adjustments in confined spaces.
- Are thermoplastic insulated bushings better than metal ones? Answer: Thermoplastic insulation offers temperature resistance and electrical insulation; metal housings provide rugged mechanical strength.
- Can these bushings be used for both copper and aluminum conductors? Answer: Many are dual-rated for Cu/Al conductors, but verify each model’s compatibility before use.
- Should I prioritize a hinged design? Answer: Yes, especially in tight spaces or when pulling wires after installation, as it improves alignment and reduces rework.
- Do these bushings require special installation tools? Answer: Most rely on standard conduit fittings and do not require specialized tools beyond typical hand tools for grounding lug connections.