UL SUBJECT-1836:2000 pdf download OUTLINE OF INVESTIGATION FOR ELECTRIC MOTORS AND GENERATORS FOR USE IN CL ASS I, DIVISION 2. AND CLASS II, DIVISION 2 HAZARDOUS (CLASSIFIED) LOCATIONS
1 Scope
1.1 These requirements cover electric motors and generators for permanent installation and use inhazardous (classified) locations, Class l, Division 2, Groups A, B, C, and D, and Class ll, Division 2.Groups F and G,in accordance with the National Electrical Code, NFPA 70.
1.2 These requirements cover both horizontal and vertical machines that have fractional and integrahorsepower ratings.
1.3 These requirements do not cover intrinsically safe motors.
1.4 A product that contains features, characteristics, components, materials, or systems new or differentfrom those covered by the requirements in this Outline of lnvestigation, and that involves a risk of fire,electric shock, or injury to persons shall be evaluated using the appropriate additional component andend-product requirements as determined necessary to maintain the acceptable level of safety as originallanticipated by the intent of this Outline of lnvestigation. A product whose features, characteristicscomponents, materials,or systems conflict with specific requirements or provisions of this Outline otinvestigation cannot be judged to comply with this Outline of lnvestigation. Where considered appropriaterevision of requirements shall be proposed and adopted in conformance with the methods employed fordevelopment, revision, and implementation of this Outline of Investigation.
2 General
2.1 General
2.1.1 These requirements apply to both Class I and ll locations unless indicated otherwise.
2.1.2 When the term “motor is employed in the following text, it is understood that the requirement alsoapplies to a generator.
2.2 Units of measurement
2.2.1 If a value for measurement is followed by a value in other units in parentheses, the second valuemay be only approximate. The first stated value is the requirement.
2.3 Components
2.3.1 Except as indicated in 2.3.2, a component of a product covered by this standard shall comply withthe requirements for that component.
2.3.2 A component need not comply with a specific requirement that:
a) lnvolves a feature or characteristic not needed in the application of the component in theproduct covered by this standard, or
b) ls superseded by a requirement in this standard.
2.3.3 A component shall be used in accordance with its recognized rating established for the intendedconditions of use.
2.3.4 Specific components are recognized as being incomplete in construction features or restricted inperformance capabilities. Such components are intended for use only under limited conditions, such ascertain temperatures not exceeding specified limits, and shall be used only under those specific conditionsfor which they have been recognized.
CONSTRUCTION
3 General
3.1 General
3.1.1 A motor that is marked to indicate that it is provided with thermal protection shall comply with theapplicable requirements in the Standard for Overheating Protection for Motors, UL 2111.
3.1.2 A motor that is marked to indicate that it is provided with impedance protection shall comply withthe applicable requirements in the Standard for Overheating Protection for Motors, UL 2111.
3.2 Class I
3.2.1 A motor for use in Class l, Division 2 locations shall be of the open or totally enclosed type.
3.2.2 A motor for use in Class l, Division 2 locations shall be for use with alternating current (ac) only.
Exception: A motor is also able to be used with direct current (dc) when it is:
a) Brushless;
b) Purged and pressurized in accordance with the Standard for Purged and PressurizedEnclosures for Electrical Equipment (National Fire Codes, vol. 7), NFPA/ANSI 496,1998; or
c)In an explosion-proof enclosure in accordance with Standard for Electric Motors andGenerators for Use in Division 1 Hazardous (Classified) Locations, UL 674.
3.2.3 An arcing or sparking part – such as a switch, a fuse, a thermal protector, or similar components -and integral variable resistance devices shall be housed in a Class l, Division 1 enclosure complying withthe requirements specified in one of the following standards:
a) Standard for Electric Motors and Generators for Use in Division 1 Hazardous (Classified)Locations，UL674;
b) Standard for Industrial Control Equipment for Use in Hazardous (Classified) Locations, UL698;