How to connect a 3M cold splice

To connect a 3M cold splice, prepare the cables, install the connector, handle neutral wires, and carefully apply the cold shrink tube over the splice body for secure insulation. Step 1: Prepare the CablesDe-energize and ground all electrical systems before starting. Verify that the cable size fits within the splice kit's insulation outer diameter range.

Remove the cable insulation according to the connector type: typically 1/2 connector length plus allowance for crimping, not exceeding 2 1/2" (64 mm) for most crimp-type connectors. Clean the cable surface using a cable cleaning pad; avoid solvents or abrasives on the semi-conductive insulation shield. Step 2: Install the ConnectorSelect the appropriate connector for the conductor material (copper or aluminum) and size.

Insert the prepared cable ends into the connector and crimp according to manufacturer specifications. Apply a tape marker on the semi-conductive insulation shield to indicate the splice location. Step 3: Handle Neutral Wires (for JCN or CN Cables)For Jacketed Concentric Neutral (JCN) cables, route neutral wires straight across the splice body and secure with vinyl tape.

Wrap the neutral pad over one end of the splice and cable semi-conductive layer, securing with two wraps of vinyl tape. For Concentric Neutral (CN) cables, bend neutral wires back over the binding, press against the cable, and temporarily secure with vinyl tape. Step 4: Apply Cold Shrink TubeSlide the cold shrink tube over the splice body, starting with the loose core end.

Slowly unwind the inner core counterclockwise while keeping the outer core stationary. If the outer core moves, gently adjust it toward the second mastic seal. Ensure the splice body ends overlap the semi-conductive layer of each cable by at least 1/2" (12.

7 mm). Avoid pushing the splice body toward the tape marker to prevent rolling under. Step 5: Shielding and GroundingCenter the expanded shield sleeve over the splice body and hand-tighten from the splice center outward.

Connect the shield sleeve to the cable metallic shield using vinyl tape and constant force springs. Trim excess sleeve 1/2" (13 mm) from the springs and wrap two layers of stretched vinyl tape over the springs. If grounding is required, connect a ground wire to the pre-installed ground braid and secure with mastic strips and tape as instructed.

Step 6: Final InspectionVerify that the cold shrink tube is fully seated and that all neutral wires, mastic, and shielding are properly secured. Ensure there are no air voids or exposed conductors. Confirm that the splice is mechanically stable and electrically insulated before re-energizing the system.

Following these steps ensures a reliable, moisture-resistant, and electrically safe connection using a 3M cold shrink splice.