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3.6.2.7.(5)
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Application
Application 1: 
Explosion-relief devices, vents or other protective measures for electrical equipment vaults that contain dielectric-liquid-filled electrical equipment, 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).
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Intent
Intent 1: 
To expand the application of Sentence 3.3.1.20.(2), which would otherwise apply only to spaces in which substances or conditions that have the potential to create an explosion hazard are present as a result of the principal use of a building, and make it applicable to an electrical equipment vault that contains dielectric-liquid-filled electrical equipment on the basis that this equipment poses a risk of explosion.
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