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3.1.9.2.(1)
ApplicationIntent
OS1+OP1
ObjectiveOS1 Fire Safety
Attribution
[F03-OS1.2] [F02,F04-OS1.3] Applies to portion of Code text: “Except as permitted by Articles 3.1.9.3. and 3.1.9.4., pipes, ducts, electrical outlet boxes, totally enclosed raceways or other similar service equipment that penetrate an assembly required to have a fire-resistance rating shall be noncombustible …”
Application
Application 1: 
Combustibility of pipes, ducts, electrical outlet boxes, totally enclosed raceways or other similar service equipment that penetrate an assembly required to have a fire-resistance rating, in buildings described in Sentence 1.3.3.2.(1) of Division A.
Exceptions: 
except:
  • as stated in Article 3.1.9.3., which applies to certain wires and cables in noncombustible raceways or embedded in a concrete floor slab, certain cables of limited diameter, certain ungrouped cables, and combustible outlet boxes,
  • as stated in Article 3.1.9.4., which applies to combustible sprinkler, water distribution, drain, waste and vent piping, and
  • if the assembly has been tested incorporating that service equipment.
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Intent
Intent 1: 
To limit the probability that certain service equipment that penetrates fire-rated assemblies will contribute to the growth and spread of fire within the assemblies, which could lead to a structural failure and collapse of the assemblies, which could lead to harm to persons.
Intent 2: 
To limit the probability that certain service equipment that penetrates fire-rated assemblies--which also form a fire separation--will contribute to the growth and spread of fire within or through the assemblies, which could lead to a loss of integrity of the fire separation, which could lead to the spread of fire and smoke from one fire compartment to another fire compartment, which could lead to harm to persons in the other fire compartment.
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