For listed through penetrations, which condition must be met when using a different manufacturer's intumescent caulk?

When using a different manufacturer's intumescent caulk for listed through penetrations, it is essential that the complete penetration is tested and listed with the alternate caulk. This condition is crucial because it ensures that the integrity and fire-resistance properties of the penetration assembly are maintained.

Intumescent caulks are designed to expand when exposed to heat, helping to seal openings and prevent the passage of fire and smoke. Each manufacturer's product may have different chemical formulations and characteristics. Therefore, using a separately tested caulk ensures that it meets the necessary performance criteria under actual fire conditions. The testing process verifies that the alternate caulk effectively works with the other components of the assembly, providing the level of protection for which the original design was intended.

Without this testing, there is no assurance that the fire-stopping system will behave as required in a fire event, potentially compromising safety. This aligns with fire codes and standards that prioritize public safety and adherence to rigorous testing protocols.