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Grounding Bushings

Grounding bushings provide a reliable means to ground and bond electrical conduit systems, ensuring safety and compliance in grounding applications. These components are designed for use with metallic conduit types, such as rigid metal conduit (RMC) and intermediate metal conduit (IMC), and feature a threaded or set screw design to secure the connection. Shop confidently with LiveWire Supply, where fast, flexible shipping is available for every order. We carry a variety of ground bushings from major brands like Crouse-Hinds.

Since 2005, LiveWire Electrical Supply has been providing quality parts and fast shipping for in-stock products—including hard-to-find ground bushings. Need help finding products? For 24/7 sales assistance, call 1-650-692-0700.

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Frequently Asked Questions

LiveWire Electrical Supply is your trusted source for hard-to-find electrical supplies, offering a wide selection of circuit breakers, fuses, safety switches, and industrial control products—all ready to ship the same day. With real-time stock and price checks, you can easily find what you need at competitive prices, whether for residential, commercial, or industrial projects. Our experts are available to assist with part identification and technical support, while our expedited shipping options and free UPS Ground shipping on qualifying orders ensure fast delivery. For 24/7 assistance and personalized support, call 1-650-692-0700.

Where is a grounding bushing required?

A grounding bushing is required where metal conduits, such as rigid metal conduit (RMC) or intermediate metal conduit (IMC), enter enclosures or equipment that require grounding to ensure electrical continuity and safety. These installations typically occur at service equipment, panelboards, transformer enclosures, and motor control centers. Grounding bushings are also necessary when metal conduit systems transition into enclosures with knockout openings or when specified by the National Electrical Code (NEC) to prevent stray voltage or ensure an adequate ground path. They are often used when metal conduit terminates at locations with concentric or eccentric knockouts, which can interfere with reliable grounding without a dedicated bonding means.

What size wire for a ground bushing?

The size of the grounding conductor used with a ground bushing depends on the size of the electrical service and the requirements specified in the National Electrical Code (NEC), particularly in NEC Table 250.122, which outlines minimum conductor sizes based on the rating of the overcurrent protection device. Generally, the conductor size must be large enough to safely carry fault current. For example, if the overcurrent protection device is rated at 100 amps, the NEC typically requires a minimum #8 AWG copper grounding conductor. Always verify the specific requirements for your installation, as factors such as conduit size, equipment rating, and local codes may affect the selection. Additionally, ensure the grounding bushing’s lug can accommodate the chosen wire size.

Do you need grounding bushings on concentric knockouts?

Yes, grounding bushings are often required on conduits that terminate in enclosures with concentric or eccentric knockouts to ensure proper grounding and bonding. The National Electrical Code (NEC) mandates the use of a grounding bushing when concentric or eccentric knockouts are used, which may compromise the electrical continuity of the metal enclosure. In such cases, a grounding bushing provides a reliable bonding path, preventing potential faults or hazardous voltage conditions. This is particularly critical in service equipment or when the conduit is carrying fault current. Always consult NEC requirements and local codes to ensure compliance in specific applications.

How do you install a grounding bushing?

To install a grounding bushing, first select the appropriate size and type to match the conduit and the requirements of the electrical system. Prepare the conduit by cutting and threading it as needed, ensuring that the edges are smooth to prevent damage to wires. Place the grounding bushing onto the end of the conduit, and if it is threaded, screw it on securely; if it uses set screws, tighten them to fasten the bushing in place. Attach the grounding conductor to the bushing’s integrated grounding lug using an appropriate connector to ensure a secure and electrically reliable connection. Tighten the connection using a torque wrench if specific torque values are required by the manufacturer. Finally, inspect the installation to verify that the bushing is correctly seated, all connections are secure, and there is no risk of wire abrasion or exposure. This ensures the grounding system provides effective and compliant electrical bonding.

Do ground rods need to be connected?
Yes, ground rods need to be connected as part of a complete grounding system. The National Electrical Code (NEC) requires that if multiple ground rods are used, they must be bonded together using a grounding electrode conductor to establish an effective and continuous grounding path. This connection ensures that all ground rods function as a unified grounding electrode system, providing a low-impedance path to Earth for fault currents and helping to equalize voltage potentials. Proper bonding between ground rods reduces the risk of electrical shock and enhances the safety and performance of the electrical system. Always follow NEC guidelines and local codes to ensure correct installation and grounding practices.

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You may return items within 30 days of delivery for a refund. Please view our return policy here.

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We offer one to five-day delivery in the United States. The variation depends on the chosen shipping speed and the warehouse location for the product(s). Please view our shipping policy here.

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We strive to ship out your items within one business day. The shipping process may take up to 5 business days on some occasions. Feel free to contact us if your order is time sensitive. Call 1-650-692-0700 or email sales@livewiresupply.com for help.

Limited Warranty

Warranty Gurantee
LiveWire certifies that every product shipped out of stock, by manufacturers and by fulfillment partners will be free of functional defects for one (1) year. If any part is found with functional defects during the warranty period, LiveWire will send out a replacement item for free. Warranty items must be returned to LiveWire for inspection and must be postmarked within the warranty period.

Contact our support team by emailing support@livewiresupply.com or calling 1-650-692-0700 during normal business hours for help with your warranty claim.

Disclaimer: Livewire Electrical Supply is not affiliated with, authorized by, or acting as a representative for the brands showcased on our platform. Please be aware that products sold by Livewire Electrical Supply do not include the original manufacturer’s warranty. All trademarks, brand names, and logos featured on this website belong to their respective owners. It’s important to note that this website is not endorsed, sanctioned, or approved by any of the manufacturers or trademark holders mentioned.

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