Electrical Installations in Hazardous Locations
55. (1) Every electrical installation in a hazardous location shall comply with Section 18, of the Canadian Electrical Code, Part I except as modified by this section.
(2) Equipment shall be approved not only for the class of location but also for the explosive, combustible, or ignitible properties of the specific gas or vapour that will be present and equipment shall not have exposed any surface that operates at a temperature in excess of the ignition temperature of the specific gas or vapour.
(3) Equipment that has been approved for a Division 1 location shall be permitted in a Division 2 location of the same class and group and equipment which requires to be approved shall be listed by the Canadian Standards Association, Underwriters Laboratories, Factory Mutual Research Corporation or other independent laboratory recognized by the Board for use in the hazardous location in which it is located.
(4) Each item of electrical equipment that is required under this section to be explosion-proof shall be listed by the Canadian Standards Association, Underwriters Laboratories, Factory Mutual Research Corporation or other independent laboratory recognized by the Board; special consideration may be given by the Board to consider "increased safety " equipment for installation in Class I, Division 2 locations provided that a certificate from an independent laboratory is submitted for evaluation; the Board may also consider electrical equipment certified Ex(d)(e) for Class I, Division I locations provided that a certificate from an independent test laboratory is submitted for evaluation.
(5) Subject to subsection (6) distribution systems with grounded neutrals, grounded phases or with hull return shall not be used in hazardous locations.
(6) Special approval for the use in hazardous locations of systems prescribed in subsection (5) may be granted for
(7) Where a subsection states that an electric system is to be intrinsically safe for use in a hazardous location, the system shall be listed as intrinsically safe by Canadian Standards Association, Underwriters Laboratories, Factory Mutual Research Research Corporation or other independent laboratory recognized by the Board and shall comply with the following:
(8) Purged and pressurized equipment shall meet the requirements of the National Fire Protection Association No. 496 or as approved by the Board.
(9) Wiring methods for Class I hazardous locations shall be in accordance with the following:
(10) Each explosion-proof switch and each switch controlling explosion-proof equipment shall have a pole for each circuit conductor.
(11) Each fan for ventilation of a hazardous location shall be so designed as to render sparking impossible in the event of the impeller tips touching the fan casing.
(12) Each electric motor for a fan that ventilates a hazardous location shall be listed by the Canadian Standards Association, Underwriters Laboratories, Factory Mutual Research Corporation or other independent laboratory recognized by the Board for the same class, division, and group as the ventilated location; or be
(13) Equipment mounted in a ventilation duct which ventilates a hazardous location shall meet the classification requirements of that space.
(14) Each belt drive in a hazardous location shall have
(15) The internal space of each pressure vessel, closed tank, and pipe for drilling mud and for gas venting shall have only certified intrinsically safe circuits or equipment and associated wiring.
(16) Distribution systems, except, intrinsically safe circuits, feeding or passing through a hazardous location referred to in this section shall have a device capable of continously monitoring the insulation level to ground and giving an audible alarm at a manned position when ground fault current exceeds 30 milliamperes above an established base level.
(17) Electrical equipment and wiring installed in hazardous locations shall be limited to that necessary for operational purposes and only the cables and types of equipment described in this Part may be installed.
Classification of Hazardous Locations
56. (1) The following are Class I, Division 1 locations:
(2) The following are Class I, Division 2 locations:
Openings, Access and Ventilation Conditions Affecting the Extent of Hazardous Locations
57. (1) Except as provided in subsection (2) access doors or other openings shall not be provided between
(2) Where such access doors or other openings are provided any enclosed space not referred to under subsections 56(1) or (2) and having a direct access to any Class I, Division 1 location or Class I, Division 2 location becomes the same division as the location except that
(3) Piping systems shall be designed to preclude direct communications between hazardous locations of different divisions and between hazardous and nonhazardous areas.
Ventilation of Spaces
58. (1) Hazardous enclosed spaces shall be ventilated and where mechanical ventilation is applied it shall be such that the hazardous enclosed spaces are maintained with underpressure in relation to the less hazardous spaces or areas and non-hazardous enclosed spaces are maintained in overpressure in relation to adjacent hazardous locations.
(2) All air inlets for hazardous enclosed spaces shall be taken from nonhazardous areas and where the inlet duct passes through a more hazardous area the inlet duct is to have overpressure in relation to this area.
(3) Each air outlet shall be located in an outdoor area which in the absence of the considered outlet is of the same or lesser hazard than the ventilated space.
Emergency Shutdown Procedures
59. (1) In view of exceptional conditions in which the explosion hazard may extend outside the above mentioned locations special arrangements shall be provided for the disconnection or shutdown either selectively or simultaneously of all electrical equipment and or devices except those services required by subsections 51(6) and (7); the emergency shut down facilities shall be provided at the drilling console and in a continually manned control room and the recommended sequence of shut-down shall be provided in the Operating Manual.
(2) Electrical shut-down systems that are provided to comply with this section shall be designed so that the risk of unintentional stoppages caused by malfunction in a shut-down system or of inadvertent operation of a shut-down are minimized.
Machinery Installations in Hazardous Locations
60. (1) Mechanical equipment shall be limited to that necessary for operational purposes.
(2) mechanical equipment and machinery in hazardous locations shall be so constructed and installed as to reduce the risk of ignition from sparking due to the formation of static electricity or friction between moving parts and from high temperature of exposed parts.
(3) Boilers and other fired appliances in which a naked flame may be present shall be located in compartments which are non-hazardous.
(4) The installation of internal combustion engines may be permitted in hazardous locations subject to the following minimum requirements:
Portable Structures in Hazardous Locations
61. (1) Portable structures installed in hazardous locations shall be fitted with
(2) The fire alarm, general alarm and public address systems shall be clearly audible inside the portable structure.
(3) Details and arrangement of the portable structure including the deck mounting arrangement shall be submitted to the Board for approval.