Morris 91740 U-Bolt Ground Clamp, 1-Conductor, 1-1/4" Pipe, 250 MCM - #4 AWG

Product Overview

The Morris 91740 is a UL467-listed copper U-bolt ground clamp that connects a single grounding conductor (250 MCM down to #4 AWG) to 1-1/4" nominal pipe or tubing, ground rod, rebar, or metal fencing.

The clamp is cast from a copper alloy and uses stainless steel bolts, nuts, and lock washers; it is listed to UL467 for direct burial in soil or encasement in concrete.

Key Features

• Accepts one conductor: 250 MCM through #4 AWG
• Designed to fit 1-1/4" nominal pipe or tubing; also used on ground rod, rebar, or fencing where a U-bolt clamp is appropriate
• Cast copper-alloy body
• Stainless steel bolts, nuts, and lock washers
• UL467 listed for direct burial in soil or encasement in concrete

What this clamp does

The Morris 91740 U-bolt ground clamp mechanically and electrically bonds a single grounding conductor to a metallic grounding electrode such as water pipe, copper tubing, ground rod, rebar, or fencing. The U-bolt holds the electrode while the saddle secures the conductor positioned parallel or at a 90° angle to the electrode.

• Creates a mechanical and electrical connection between conductor and electrode
• Accepts conductor positioned parallel or at 90 degrees to the electrode

Where to use it

This clamp is intended for grounding-electrode connections and is listed to UL467 for direct burial in soil or encasement in concrete. Typical uses include bonding a service or equipment grounding conductor to water piping, copper tubing, ground rods, rebar in concrete, or metal fencing where a U-bolt attachment is appropriate.

• Suitable for direct-burial grounding-electrode systems where a UL467-listed clamp is required
• Used to bond a single grounding conductor to metallic electrodes such as pipe, rod, rebar, or fencing

Materials and corrosion resistance

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

• Copper-alloy body
• Stainless steel bolts, nuts, and lock washers

Conductor and pipe size compatibility

The 91740 supports a single conductor in the range 250 MCM to #4 AWG and is designed for use on 1-1/4" nominal pipe or tubing. Verify conductor and electrode dimensions at the job site prior to ordering.

• Wire range: 250 MCM to #4 AWG
• Fits 1-1/4" nominal pipe or tubing

Basic installation notes

Place the U-bolt around the electrode, seat the grounding conductor in the saddle, then tighten the nuts to clamp the conductor and electrode together. Follow applicable codes and project specifications when installing grounding connections.

• U-bolt fits around the electrode; conductor sits under the saddle
• Tighten nuts to secure both conductor and electrode
• Follow applicable codes and project specifications

Before You Order

Confirm the model number and that conductor size and electrode diameter match your project requirements.

• Verify conductor size falls within 250 MCM to #4 AWG.
• Verify the electrode or pipe diameter is 1-1/4" nominal.
• Confirm a UL467-listed direct-burial clamp satisfies your local code or inspection requirements.

Ordering from Lumera Electric

Check the purchasing options shown on the Lumera Electric product page for Morris 91740 U-Bolt Ground Clamp, 1-Conductor, 1-1/4" Pipe, 250 MCM - #4 AWG. For project quantities or additional ordering requirements, use Request a Quote and provide the required quantity.