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3.6.2.7.(3)
ApplicationIntent
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
[F02-OS1.2] [F11-OS1.5] [F03-OS1.4]
Application
Application 1: 
Sprinkler protection [typically required in Clause 3.6.2.7.(2)(b)] of 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).
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A, where:
  • the building is sprinklered throughout,
  • the vault is designed for no purpose other than to contain the electrical equipment, and
  • the vault contains a smoke detector, which will actuate the building fire alarm system in the event of a fire in the vault.
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 other provisions of the Code [typically Clause 3.6.2.7.(2)(b)] for the inclusion of sprinklers in an electrical vault located in a building that is otherwise sprinklered throughout, if certain conditions are met.
This is to limit the probability that:
  • other fire hazards will be present in the vault, which could lead to a fire involving the electrical equipment, which could lead to the spread of fire from the vault to other parts of the building, which could lead to harm to persons in other parts of the building,
  • smoke from a fire in the vault will not be promptly detected, which could lead to persons not being notified of the fire situation, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons, and
  • a fire originating in a location outside the 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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