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5.5.3.6.(1)
OS1OS3OH5OP1
ObjectiveOS3 Safety in Use
Attribution
Application
Application 1: 
Inspection, testing and maintenance of electrical equipment, mechanical systems, piping, valves, and automatic and manual control and safety devices in laboratories.
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.
Exceptions: 
except as stated in:
  • Sentence 5.5.3.6.(2), which applies to ventilation systems,
  • Sentence 2.6.1.6.(2), which applies to disconnect switches of ventilation systems, and
  • Sentence 2.6.1.3.(1), which applies to ventilation systems subject to accumulations of combustible deposits.
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Intent
Intent 1: 
To limit the probability that ineffectiveness or failure of the components [electrical equipment, mechanical systems, piping, valves, and automatic and manual control and safety devices] will lead to an unwanted release of dangerous goods, which could lead to harm to persons.
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