SECTION 5.1  GENERAL

Subsection 5.1.1.  Application

Application

5.1.1.1.  This Part applies to materials, processes and operations that involve a risk from explosion or high flammability, or otherwise create a hazard to life safety or health.

Subsection 5.1.2.  Means of Egress

Means of egress

5.1.2.1.  Hazardous materials, processes and operations shall be located and the premises maintained so that the means of egress will not be obstructed in any manner that would interfere with evacuation of the floor area in the event of a fire.

Subsection 5.1.3.  Electrical Installations

Electrical installations

5.1.3.1.  Electrical installations shall conform to the Electrical Safety Code made under the Electricity Act, 1998.

Subsection 5.1.4.  Ventilation

Ventilation requirements

5.1.4.1.  Ventilation shall be provided for hazardous locations and processes in conformance with the Building Code and the requirements of this Part.

Ventilation of processes using flammable gas

5.1.4.2.  (1)  Subject to Sentence (2), operations involving the use of flammable gas shall be provided with continuous mechanical ventilation that

(a)   is sufficient to ensure that flammable gas concentrations outside any zone identified as Class I, Zone 2 in accordance with the Electrical Safety Code made under the Electricity Act, 1998, do not exceed 25% of the lower explosive limit of the flammable gas,
(b)   contains automatic interlocks so that the processes using flammable gas cannot be performed when the ventilation system is not in operation,
(c)   is provided with an audible alarm in an attended area that activates upon shutdown of the ventilation system,
(d)   conforms to NFPA 91, “Standard for Exhaust Systems for Air Conveying of Vapors, Gases, Mists and Noncombustible Particulate Solids”,
(e)   is not used for any purpose other than ventilation and exhaust,
(f)   is kept free of obstructions that may interfere with its operation, and
(g)   if it recirculates exhaust air, is provided with a fail-safe gas detection and alarm system that continuously monitors the flammable gas concentration in the exhaust air, so that if the flammable gas concentration in the exhaust air exceeds 25% of the lower explosive limit, the system will

(i)   sound an alarm in an attended area,
(ii)   stop the recirculation of air, and
(iii)   redirect the exhaust air to an outdoor location.

   (2)  Sentence (1) does not apply to operations where flammable gas is only used as a fuel.