4  SPECIFIC PRINCIPLES TO COVER EXCEPTIONS AND ADDITIONS TO THE DESIGN, CONSTRUCTION AND CLEANING OF ALL BAKERY EQUIPMENT, AS DEFINED IN SECTION 3.

4.28  DESIGN REQUIREMENTS FOR ELECTRIC MOTORS AND ACCESSORY EQUIPMENT

4.28.1 Definitions:

4.28.1.1 Electric Motor: A device, which converts electrical energy into mechanical energy, imparting torque to a mechanical power transmission drive system.

4.28.1.2 Accessory Equipment: For the purpose of this standard, accessory equipment are those mechanical torque converting devices which are attached (closed) to the electric motor, such as a gear head, speed changing device, clutch, or brake.

4.28.1.3 Totally Enclosed Motor: A motor that prevents the free exchange of air into or out of the motor housing.

4.28.1.4 Totally Enclosed Non-ventilated Motor: A motor without an integral fan or fans, external to the housing.

4.28.1.5 Totally Enclosed Fan-cooled Motor: A motor cooled with a fan or fans, integral with the motor but external to the housing.

4.28.1.6 Explosion-proof Motor: A totally enclosed motor capable of withstanding an explosion within the motor housing and one that cannot cause ignition of external gas, vapor, or dust through sparks, flashes or internal housing explosions.

4.28.1.7 Wash Down Motor: An electrical motor that is designed to be washed with water without any changes in operating characteristics.

4.28.1.8 Easy Clean Motor: An electric motor that has been designed and built to reduce obstructions to cleaning, as far as operation and economics allow, but not meeting the standard completely. Easy clean can be washed down, if caustic solutions are not used.

4.28.2 Specific Design Requirements

4.28.2.1 Covers for cooling fans of totally enclosed fan-cooled motors and accessory equipment shall be securely fastened and removable for cleaning.

4.28.2.2 The conduit box shall be sealed to, or integral with, the frame.

4.28.2.3 Mounting feet shall be designed and constructed so that all joints of the support to the frame shall be free of crevices. Non-toxic, permanently bonded filler material may be used to eliminate crevices.

4.28.2.4 Breather assemblies shall be removable and readily accessible and shall prevent the passage of foreign material.

4.28.3 Application Requirements for Motors and Accessory Equipment

4.28.3.1 Totally enclosed motors and accessory equipment shall be specified.

4.28.3.2 In hard to reach areas, wash-down or easy clean motors should be considered.