Historical
CAN/CSA C22.2 No. 157-92 (R2006)
CAN/CSA-C22.2 NO. 157-92 (R2006) - Intrinsically Safe and Non-Incendive Equipment for Use in Hazardous Locations
This PDF includes update #2.
Intended Use
Products evaluated to this standard are applied in hazardous locations which are defined as buildings, or parts thereof in which:
(a) an explosive gas atmosphere is present, or may be present, in the air in quantities that require special precautions for the construction, installation, and use of electrical equipment;
(b) combustible dusts are present, or may be present, in the form of clouds or layers in quantities to require special precautions for the construction, installation, and operation of electrical equipment; or
(c) combustible fibres or flyings are manufactured, handled or stored in a manner that will require special precautions for the construction, installation, and operation of electrical equipment.areas that are or could be a hazardous location due to the presence of an explosive gas atmosphere or (a mixture with air, under atmospheric conditions, of flammable substances in the form of gas, vapour, or mist in which, after ignition, combustion spreads throughout the unconsumed mixture).
1. Scope
1.1 This Standard specifies tests for the testing of non-incendive electrical equipment and the details of construction and tests for intrinsically safe electrical equipment for use in the following hazardous locations in accordance with the Rules of the Canadian Electrical Code, Part I, and CSA Standard CAN3-M421: (a) Class I, Groups A, B, C, and D; (b) Class II, Groups E, F, and G; (c) Class III; and (d) gaseous mines.1.2 This Standard specifies the design and constructional requirements and test procedures for equipment and parts of equipment intended for use in hazardous locations and also for associated equipment intended for use in safe locations.
1.3 This Standard applies to equipment for use in normal atmospheric conditions.
1.4 Equipment specified for use in other than normal atmospheric conditions may be subject to additional investigation.
Content Provider
CSA America, Inc. [csa]
