Best Methods for Sealing Spaces Around Wires Entering a Service Panel1. Stuffing with Non-Combustible Material Use non-insulated fiberglass, ceramic wool, or fire-rated expanding foam to tightly fill the gaps around the wires. Ensure the material does not impede wire movement or ventilation within the panel.2. Flexible Sealant Apply a thin bead of fire-rated silicone sealant around the wires where they enter the nipple. Smooth the sealant evenly to create a tight seal.3. Inserting a Service Panel Seal Purchase a pre-fabricated service panel seal designed to fit the size of the chase nipple. Insert the seal over the wires and push it into the chase nipple. Ensure the seal is properly seated and covers all wire penetrations.4. Modification of the Chase Nipple If possible, add additional supports to the chase nipple to prevent it from moving and creating gaps. Use a larger chase nipple that will accommodate the wires with less space around them.

Materials to Avoid Do not use flammable materials like cotton balls or foam rubber insulation. Avoid using expanding foam that is not fire-rated.

Additional Considerations If there are significant gaps, consider installing a service panel extension ring or backplate to provide more space for wiring. Ensure proper ventilation within the service panel to prevent overheating. Inspect the seal periodically and re-apply or replace as needed.

Note:

The specific method chosen may depend on the size of the gaps, the type of panel, and the available options. Always follow the manufacturer's instructions and local building codes when sealing openings around wires. Flag for review