![]() ![]() An explosion proof seal shall not be required for this purpose.” “Where portions of a 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. Sealants shall be identified for use with cable insulation, conductor insulation, bare conductor, shield, or other components.” Related Content: Sealing Conduits for Resilient Electrical and Telecommunication Systems Spare or unused raceways shall also be sealed. “Conduits or raceways through which moisture may contact live parts shall be sealed or plugged at either or both ends. Sealants shall be identified for use with the cable insulation, shield, or other components.” NEC 300.5 (D)) G) Raceway Seals: “Where a service raceway enters a building or structure from an underground distribution system, it shall be sealed in accordance with 300.5(G). Sealants shall be identified for use with cable insulation, conductor insulation, bare conductor, shield, or other components.” NEC 230.8 Raceway Seal: “Where a raceway enters a building or structure from outside, it shall be sealed. Let’s review the language in a sampling of pertinent electrical and communication industry codes from around the world: NEC 225.27 Raceway Seal: ![]() The infographic linked here and also found below, illustrates the need for duct seals and lists various governing standards.
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