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4.5.8.4.(3)
ApplicationIntent
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
[F82,F01,F20-OS1.1]
Application
Application 1: 
Testing of completed system installations for thermal electrical conduction heating using low-voltage alternating current, for piping for flammable liquids and combustible liquids, in buildings, structures and open areas.
Application 2: 
This also applies on piers and wharves, as stated in Sentence 4.8.4.1.(1).
Exceptions: 
except as exempted in:
  • Sentences 4.1.1.1.(2) and (3), which apply to unique hazards at process plants, in transportation, for oil burning equipment, on farms and isolated construction projects, and the storage of aerosol products; and
  • Sentence 4.5.1.1.(2), which applies to:
    • tubing or casings and piping for oil or gas wells,
    • transmission pipelines,
    • piping for vehicles, aircraft, watercraft and portable or stationary engines,
    • piping systems in fuel dispensing stations and distilleries, and
    • piping within the scope of the applicable provincial boiler and pressure vessel codes.
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Intent
Intent 1: 
To limit the probability that the heating systems will be an ignition source, which could lead to the ignition of nearby vapour from escaped liquid from the piping system, which could lead to a fire or explosion, which could lead to harm to persons.
Intent 2: 
To limit the probability that liquid will be overheated, which could lead to failure of the piping system to contain the liquid, which could lead to the escape of liquid, which could lead to the accumulation and subsequent ignition of vapour from a nearby ignition source, which could lead to harm to persons.
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