Morris 91750 U-Bolt Ground Clamp, 1-Conductor, 3-1/2" Pipe, 250 MCM - #4 AWG

Product Overview

The Morris 91750 is a UL467-listed copper U-bolt ground clamp for attaching a single grounding conductor (250 MCM down to #4 AWG) to a 3-1/2" pipe or similar round electrode.

The clamp is cast from a copper alloy and uses stainless steel bolts, nuts, and lock washers. It is listed for direct burial in soil or embedment in concrete per UL467.

Key Features

• Connects one ground conductor parallel or at 90° to a 3-1/2" pipe or similar round electrode
• Wire range: 250 MCM down to #4 AWG
• Cast copper-alloy body
• Stainless steel bolts, nuts, and lock washers
• UL467 listed for direct burial in soil or concrete

What this clamp does

The Morris 91750 U-bolt ground clamp secures a single grounding conductor to round electrodes such as 3-1/2" water pipe, copper tubing, ground rod, rebar, or fencing, permitting the conductor to be positioned parallel or at a 90° angle to the electrode.

• Type: Copper U-bolt ground clamp for one conductor
• Orientation: Supports parallel or 90° conductor positioning

Where to use it

Use this clamp to bond one conductor (250 MCM–#4 AWG) to round electrodes with a 3-1/2" diameter in grounding-electrode systems. The product is UL467 listed for direct burial in soil or embedment in concrete.

• Typical electrodes: 3-1/2" water pipe, copper tubing, ground rod, rebar, fencing
• Listing: UL467 for direct burial or concrete embedment

Materials and durability

The clamp body is cast from a copper alloy. Fastening hardware—bolts, nuts, and lock washers—is stainless steel.

• Clamp material: Cast copper alloy
• Hardware: Stainless steel bolts, nuts, lock washers

Wire and conductor compatibility

The 91750 is specified for a single conductor with a wire range from 250 MCM down to #4 AWG. Confirm conductor size before selection.

• Supported conductor sizes: 250 MCM through #4 AWG
• Number of conductors: 1

Basic installation guidance

Place the U-bolt around the electrode, seat the conductor in the clamp groove, and tighten the nuts to secure the conductor. Follow applicable local electrical codes and project specifications for installation and torque requirements.

• Fit the U-bolt around the 3-1/2" electrode, place conductor in groove, tighten nuts
• Adhere to local code and project specifications for bonding and torque

Before You Order

Confirm the 3-1/2" electrode diameter and that your conductor size is within the 250 MCM to #4 AWG range before ordering.

• Verify electrode diameter is 3-1/2"
• Confirm conductor size is within 250 MCM to #4 AWG

Ordering from Lumera Electric

Check the purchasing options shown on the Lumera Electric product page for Morris 91750 U-Bolt Ground Clamp, 1-Conductor, 3-1/2" Pipe, 250 MCM - #4 AWG. For project quantities or additional ordering requirements, use Request a Quote and provide the required quantity.