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3.6.2.7.(4)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Penetration of fire separations [referred to in Sentence 3.6.2.7.(2)] of electrical equipment vaults, in buildings described in Sentence 1.3.3.2.(1) of Division A.
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).
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Intent
Intent 1: 
To supersede the requirements of Subsections 3.1.8., 3.1.9. and 3.2.8., which would otherwise permit openings in the fire separations of vaults, and limit the openings to only certain penetrations, on the basis of maintaining the integrity of the separations.
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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