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  1. Control and Instrumentation
    https://controlandinstrumentation.com/resources/temperature-classification.html

    Temperature Classification (T class) - what it means

    • Temperature classification (also known as temperature class, or T class) defines the maximum surface temperature that a product destined for use in a potentially hazardous atmosphere is allowed to o… See more

    Why Is Temperature Class Important?

    All flammable gases have an auto-ignition temperature. If a flammable mixture of the gas is exposed to a component above the auto-ignition temperature then the mixture will ignite. … See more

    Control and Instrumentation
    T-Class and Equipment Marking

    The ATEX directives typically require all products certified suitable for use in a hazardous area, e.g. instruments, enclosures, luminaries etc to be marked with their te… See more

    Control and Instrumentation
    Temperature Class For Group I Applications

    Temperature classes do not apply to Group I applications, i.e. equipment for use in the mining industry. Mining equipment has either a rigid 150°C or 450°C limit. See more

    Control and Instrumentation
    Temperature Class For Group II Applications

    The temperatures corresponding to each temp class are shown below. It is worth noting that North American and Canadian standards differ from European standards by having s… See more

    Control and Instrumentation
    What is the temperature tolerance for a motor?
    Operation temperature is reference temperature + allowable temperature rise + allowance for "hot spot" winding. Example Temperature Tolerance Class F: In general a motor should not operate with temperatures above the maximum. Each 10 oC rise above the rating may reduce the motor lifetime by one half.
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    Table of Contents
    Why Is Temperature Class Important?
    T-Class and Equipment Marking
    Temperature Class For Group I Applications
    Temperature Class For Group II Applications
    What is the temperature tolerance for a motor?
     

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  2. Learning Electrical Engineering
    https://www.electricalengineeringtoolbox.com/2016/...

    Insulation Classes for Electric Motors - Learning Electrical …

  3. The Engineering ToolBox
    https://www.engineeringtoolbox.com/nema-insulation...

    NEMA Insulation Classes - The Engineering ToolBox

  4. Motion Control Tips
    https://www.motioncontroltips.com/what …

    What does motor insulation class specify and why is it …

    Jan 4, 2021 · Motors rated as class “F/B” have a maximum winding temperature equal to that of insulation class F (155 degrees C), but an allowable temperature rise of insulation class B (80 degrees C), giving an additional 25 degree …

  5. NEMA
    https://www.nema.org/docs/default-source/motor-and...
    [PDF]

    NEMA vs. IEC Norms

  6. Power Transmission Engineering Magazine
    https://www.powertransmission.com/ext/resources/...
    [PDF]

    Baldor Basics: Motors / Motor Temperature Ratings & Metric …

  7. The Engineering ToolBox
    https://www.engineeringtoolbox.com/electrical...

    Electrical Motors - Insulation Classes - The Engineering ToolBox

  8. Drives and Automation
    http://www.drivesandautomation.co.uk/...

    NEMA insulation classes for motors - Drives and …

    The Surface temperature of the motor is typically 30°C lower than it is at the windings. So if we look at a Class F insulated motor which will be happy running at 155°C and then subtract 30°C, we get a surface temperature of 125°C.

  9. hubspotusercontent10.net
    https://f.hubspotusercontent10.net/hubfs/1792768...
    [PDF]

    NEMA Standards for Electric Motors

  10. The Snell Group
    https://www.thesnellgroup.com/featured …

    Understanding Insulation Class and Temperature | The …

    There are four classes of insulation - A, B, F, and H - class F being the most used. These insulation classes were established to meet motor temperature requirements found in industrial applications. Class A is an older form of …