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A basic understanding of the National Electrical Code's position on duct sealing will be helpful to your sales of FST Foam Duct Sealant. Article 230.8 states that, "Where a service raceway enters a building or structure from an underground distribution system, it shall be sealed in accordance with 300.5(G). Spare or unused raceways shall also be sealed. Sealants shall be identified for use with the cable insulation, shield, or other components.” Article 300.5(G) states that, "Conduits or raceways through which moisture may contact energized live parts shall be sealed or plugged at either or both ends. Presence of hazardous gases or vapors may also necessitate sealing of underground conduits or raceways entering buildings." Article 300.7(A) states that, "Where portions of a cable, raceway, or sleeve are known to be subjected to different temperatures and where condensation is known to be a problem as in cold storage areas of buildings or where passing from the interior to the exterior of a building, the raceway or sleeve shall be filled with an approved material to prevent the circulation of warm air to a colder section of the raceway or sleeve. An explosion proof seal shall not be required for this purpose." A sampling from the Internet shows that the State of New Hampshire's Electrical Safety & Licensing Board lists failure to comply with 230.8 as one of the top 20 most common installation deficiencies. So there is plenty of room for growth. The big question is, what is an "approved material"? Generally, the code leaves approval up to the AHJ ("Authority Having Jurisdiction"). Duct putty is a commonly used product, but it is ineffective. That's where FST shines. It works wonderfully at blocking water and gases, easily outlasting and out-performing duct putty. It's compatible with cables and conduits, and is UL recognized. Happy selling. |
