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3.6.2.7.(2)
ApplicationIntent
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
[F03-OS1.2,OS1.4]
Application
Application 1: 
Construction material and minimum fire-resistance rating of fire separations of electrical equipment vaults, in buildings described in Sentence 1.3.3.2.(1).
This applies to electrical equipment vaults [referred to in Sentence 3.6.2.7.(1)] required by:
  • provincial, territorial, or municipal regulations, or
  • CSA C22.1, “Canadian Electrical Code, Part I,” in the absence of regulations referred to in Clause 3.6.2.7.(1)(a).
Application 2: 
This also applies to transformer vaults in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], as stated in Sentence 9.10.1.2.(1).
Exceptions: 
except as exempted in Sentence 3.6.2.7.(3), which applies to the requirement for a fire extinguishing system in Clause 3.6.2.7.(2)(b) if the building is sprinklered throughout.
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Intent
Intent 1: 
To supersede the requirements of Sentence 3.6.2.1.(5), which would otherwise require a minimum 1 h fire separation, and require a higher minimum rated separation, on the basis that vaults pose a higher risk of fire or explosion.
Intent 2: 
To limit the probability that fire will spread from the vault to other parts of the building, which could lead to harm to persons in other parts of the building.
Intent 3: 
To limit the probability that a fire originating in a location outside a vault will spread into the vault, which could lead to the disruption and discontinuation of service from equipment located in the vault, which could lead to an undue fire hazard in the building, which could lead to harm to persons.
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