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5.5.3.5.(3)
ApplicationIntent
OS1
ObjectiveOS1 Fire Safety
Attribution
[F01,F02-OS1.1,OS1.2]
Application
Application 1: 
Ignition sources that are an integral part of an operation involving flammable vapours, where:
  • the supply of flammable liquids or combustible liquids for the operation is controlled and kept to a strict minimum,
  • flammable vapours and combustion fumes are exhausted in conformance with Article 5.5.4.2.,
  • there is no other source of ignition capable of igniting the flammable vapours in an uncontrolled manner, and
  • there is no combustible material in the immediate vicinity of this operation.
This applies to laboratories where dangerous goods, including flammable liquids and combustible liquids, are used in normal laboratory operations in quantities or in a manner that creates a fire or explosion hazard.
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Intent
Intent 1: 
To override the prohibition for ignition sources in Sentence 4.1.5.2.(1) and the requirement for electrical equipment in Sentences 4.1.4.1.(1) and 5.5.3.4.(1) if:
  • the ignition source is necessary for the conduct of laboratory operations [i.e. is an integral part of them], and
  • measures are taken to limit the probability that the ignition source will lead to an uncontrolled fire and spread beyond the point of origin, which could lead to harm to persons.
Intent 2: 
To state the application of Article 5.5.4.2., with respect to the exhausting of flammable vapours and combustion fumes.
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