Motors. All motors shall be drip-proof protected, except those exposed to the weather, which shall be waterproof construction. All motors shall be NEMA type, and shall be sized and designed for continuous operation of the driven auxiliary at rated capacity. All motors shall be designed for an ambient temperature of 50 degrees C. All motors shall be equipped with anti-friction bearings. All motors using grease-lubricated bearings shall be provided with grease fittings and shall have positive means for preventing grease from being forced out upon the motor windings.
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