15 (1) A compression-ignition engine that is or will be installed in a machine to be used only in a hazardous location where the maximum permissible surface temperature for the machine is 200°C or less may, if the engine or the machine bears the markings referred to in rule 18-052 of the most recent version of the Canadian Standards Association standard C22.1, Canadian Electrical Code, Part 1, conform to the following emission standards instead of those referred to in subsection 10(1) or 11(1), as applicable:
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