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5.6.2.2.(1)
ApplicationIntent
OS1
ObjectiveOS1 Fire Safety
Attribution
[F81-OS1.1,OS1.2]
Application
Application 1: 
Maintaining existing gas, electrical, water, steam and other services within the area of the excavation, where:
  • before work begins, the approval of the service company involved is obtained to the proposed method of operation,
  • the location of the services is determined before excavation commences,
  • a suitable method of excavation is adopted that will ensure that the services are not damaged, and
  • suitable temporary supports are provided.
This applies to excavation work at sites where buildings are undergoing construction, alteration or demolition, including any incomplete or abandoned buildings.
Exceptions: 
except as stated in Sentence 5.6.1.1.(2), which applies to construction or demolition activities involving buildings that:
  • do not pose an exposure hazard to other buildings, or
  • pose a minimal fire hazard to occupants.
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Intent
Intent 1: 
To exempt certain services from the application of Sentence 5.6.2.1.(1), which would otherwise require that services be shut off or disconnected, if certain measures are taken, on the basis that these services are needed during excavation.
This [the measures] is to limit the probability that:
  • services will be operated in an unsafe manner, which could lead to a fire or explosion, which could lead to harm to persons,
  • services will be physically damaged [e.g. damage to fuel lines causing an unwanted leak], which could lead to a fire or explosion, which could lead to harm to persons,
  • supporting structure for the services will fail, which could lead to damage to the services [e.g. fuel pipe failure or exposure of electrical lines], which could lead to a fire or explosion, which could lead to harm to persons, and
  • water services will be physically damaged, which could lead to an inadequate water supply to fire suppression systems [sprinklers, standpipes, yard hydrants] in a fire situation, which could lead to the fire not being suppressed or controlled, which could lead to the spread of fire, which could lead to harm to persons.
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