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Ground Bushing · 1 in Trade Size · Insulated Throat for Rigid/IMC Conduit · Bridgeport Fittings GB1
SKU: GB1
Insulated 1 in ground bushing for rigid or IMC conduit, used to bond the raceway and protect conductor insulation at the conduit entry. Commonly selected for panels, enclosures, and service raceways where a bonding connection is required.
Delivered to you by Sep 10 (Within Western Canada)
If shipping issues arise, contact us and we’ll work with the courier to keep your job on track.
What this product is for
This 1 in trade size ground bushing is used on rigid metal conduit or IMC to provide a bonding point and an insulated throat where conductors enter an enclosure. It helps reduce abrasion at the conduit end while supporting a code-compliant grounding path when installed correctly.
Use for
Use for 1 in rigid metal conduit or IMC terminations at panels, cabinets, pull boxes, wireways, and other metal enclosures where bonding and conductor protection are needed. It is commonly used in commercial, industrial, and service entrance work.
Avoid for
Avoid using this as a substitute for the correct bonding method where a different fitting, bonding bushing style, or lug configuration is specified by the installation design or local code. Do not use on conduit sizes other than 1 in trade size.
Best for
Best for electricians needing a straightforward grounding bushing for threaded rigid or IMC conduit entries into metal equipment. It suits jobs where conductor insulation protection and a bonding connection are both required at the raceway termination.
Installed in
Typically installed in electrical rooms, service equipment, distribution panels, MCCs, commercial tenant fit-outs, industrial equipment connections, and retrofit raceway work. For 1 in conduit, the nominal trade size is approximately 1 in (27 mm).
Why this product exists
Standard locknuts secure the raceway, but a ground bushing adds an insulated bearing surface for conductor protection and provides a dedicated grounding point. This is useful where conductors pass through threaded metal raceway terminations and the installation requires bonding at the enclosure.
Compared with similar products
Compared with a standard insulating bushing, a ground bushing adds a bonding function. Compared with split grounding bushings, this style is typically chosen where the bushing is installed during assembly rather than after conductors are already pulled. Selection should match the conduit type, trade size, and grounding method required on the job.
Typical guidance only: electricians often choose grounding bushings where service raceways or metal enclosures require a clear bonding point in addition to conductor protection. Actual installation requirements depend on equipment design, conductor type, and local electrical code.
Specifications
- Product type: Ground bushing
- Trade size: 1 in (27 mm nominal)
- Conduit compatibility: Rigid metal conduit and IMC
- Function: Raceway bonding point and insulated conductor entry protection
- Application: Panels, cabinets, boxes, and metal enclosures
- Brand: Bridgeport Fittings
- Manufacturer part number: GB1
Minimum Order $20
We accept the following payment methods:
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Standard Shipping-Free on orders over $500 in Metropolitan Areas / Subject to $750 in Rural Areas.
Minimum Order Is $20
Freight Surcharge Apply To Oversized/Over-Weight Items(Not Limited To):
- PVC and EMT Pipe
- Wire and Cable
- Items over 48 inches in length
Surcharges are applied to items on an individual basis regardless if the rest of the order meets prepaid levels. If a freight line appears at the time of check out it only applies to the Items carrying a surcharge and not the entire basket of goods.
Shipping Options:
- A courier can deliver to your home, office, or your job site
- Pick up at local depot near you (applies to the following locations)
Edmonton Warehouse 8135 Roper Rd Edmonton, T6E 6S4, AB
Orders are typically delivered within two to eleven business days. The transit time begins the first full shipping day after your order leaves our warehouse. Please allow an additional 2-5 days for delivery to remote locations, additional fees may apply.
THE FOLLOWING APPLIES TO STANDARD SHIPPING OPTIONS
- We cannot deliver to P.O. boxes.
- A signature may be required for shipments over $500.
- No weekend delivery.
- Wire & cable, EMT or PVC conduit, tube lamps 4ft or greater, and 10ft ground rods & mast pipes have special conditions.
Standard Shipping cost on orders less than $499
Total shipping cost = "Per Shipment" cost + "Per Item" cost. The "per item" cost is listed in terms of price per pound.
Product Group | Per Shipment* | Per Item |
|---|---|---|
Boxes | $6.99 | $1.49/lb |
Conduit & Raceway | $149.99 | $2.49/lb |
Connectors & Fittings | $5.99 | $1.19/lb |
Data & Structured Home | $5.99 | $1.19/lb |
Distribution Equipment | $5.99 | $1.19/lb |
Emergency Lighting | $6.99 | $1.49/lb |
Heating & Ventilation | $6.99 | $1.49/lb |
Lighting Controls | $5.99 | $1.19/lb |
Lighting Indoor | $6.99 | $1.49/lb |
Lighting Outdoor | $6.99 | $1.49/lb |
Tools | $4.99 | $.99/lb |
Wire & Cable | $49.99 | $2.29/lb |
Wiring Devices | $5.99 | $1.19/lb |
Any combination of the above items | Highest applicable per-shipment charge | As above |
Effective Date: August, 15, 1998(Updated August 2026)
At Evolt Electrical Supply, customer satisfaction is our top priority. Please review our return policy below:
Returns
Defective Items:
- If you receive a defective item, you may return it for a replacement or refund within 30 days of purchase.
- To initiate a return, please contact our customer service team with your order number and a description of the defect.
Non-Defective Items:
- We do not accept returns for non-defective items. All sales are final once the product is shipped or ordered from the manufacturer. In certain circumstances we may amend this so feel free to contact our customer service team.
Return Process
Authorization:
- Before returning any items, you must obtain a Return Merchandise Authorization (RMA) number from our customer service team. Returns without an RMA number will not be accepted.
- Backordered items can not be cancelled if the item is in transit from the manufacturer, contact us to review.
Shipping:
- Customers are responsible for the return shipping costs. We recommend using a trackable shipping service or purchasing shipping insurance.
Condition:
- Returned items must be in their original packaging and condition. Any items returned damaged due to improper packaging or misuse will not be eligible for a refund or replacement.
Refunds
- Once we receive and inspect your returned item, we will notify you of the approval or rejection of your refund.
- Approved refunds will be processed within [7] business days and a credit will automatically be applied to your original method of payment.
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