What type of motors must not be placed inside booths and ducts driving exhaust fans?

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The correct answer pertains to the type of motors that are typically safe to operate in specific environments, particularly in areas where flammable or hazardous materials may be present, such as booths and ducts for exhaust fans. Electric motors, which include both AC and DC motors, can generate sparks due to brush contact in certain designs (especially in brushed DC motors) or potential short circuits. As a result, placing them in potentially combustible or explosive atmospheres can pose significant safety risks.

Regulations often dictate that only motors specifically designed for hazardous locations, such as explosion-proof motors, can be used in these environments to prevent ignition of flammable vapors or dust. This is why electric motors in general cannot be used within booths and ducts that handle exhaust systems without proper safeguards or design considerations.

In contrast, hydraulic motors are typically powered by hydraulic fluid and do not operate with electrical components that could spark, making them more suitable for use in such environments, provided proper measures are taken in the setup. Thus, the safety concerns surrounding electric motors in potentially hazardous atmospheres underscore the reason for their ineligibility in those specific applications.

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