Section 75.523-2 - Deenergization of self-propelled electric face equipment; performance requirements(a) Deenergization of the tramming motors of self-propelled electric face equipment, required by paragraph (a) of § 75.523-1 , shall be provided by: (1) Mechanical actuation of an existing pushbutton emergency stopswitch,(2) Mechanical actuation of an existing lever emergency stopswitch, or(3) The addition of a separate electromechanical switch assembly.(b) The existing emergency stopswitch or additional switch assembly shall be actuated by a bar or lever which shall extend a sufficient distance in each direction to permit quick deenergization of the tramming motors of self-propelled electric face equipment from all locations from which the equipment can be operated.(c) Movement of not more than 2 inches of the actuating bar or lever resulting from the application of not more than 15 pounds of force upon contact with any portion of the equipment operator's body at any point along the length of the actuating bar or lever shall cause deenergization of the tramming motors of the self-propelled electric face equipment.38 FR 3406, Feb. 6, 1973; 38 FR 4394, Feb. 14, 1973