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Explosion-Proof Motors. When electric motors are required in any room containing explosive or flammable vapor or atmosphere, such motors shall be of types approved, for use in hazardous locations, as required by the electrical regulations of this Code.
Other Motors. Any electrical motor, other than an explosion-proof motor, shall be located in a separate building, or separated by a standard fire wall from any room or hazardous use unit containing explosive or flammable vapor or atmosphere.
Switches and Control Devices. Every electric switch or other control device in any room required by the first paragraph to have explosion-proof motors, shall be of a type approved for use in the presence of explosive or flammable vapor or atmosphere.
(Prior code § 129.1-12)