shall be permitted to be waived where the entire panel

and disconnecting means are arranged so that they can be readily removed from the machine space and are provided with flexible leads to all external connections. ARTICLE 620 - ELEVATORS, DUMBWAITERS 70-663 Where control panels are not located in the same space as the drive machine, they shall be located in cabinets with doors or removable panels capable of being locked in the closed position. Such cabinets shall be permitted in the balustrading on the side away from the moving steps or moving treadway. J. Grounding 620-81. Metal Raceways Attached to Cars. Metal raceways, Type MC cable, Type MI cable, or Type AC cable attached to elevator cars shall be bonded to grounded metal parts of the car that they contact. 620-82. Electric Elevators. For electric elevators, the frames of all motors, elevator machines, controllers, and the metal enclosures for all electric devices in or on the car or in the hoistway shall be grounded in accordance with Article 250. 620-83. Nonelectric Elevators. For elevators other than electric having any electric conductors attached to the car, the metal frame of the car, where normally accessible to persons, shall be grounded in accordance with Article 250. 620-84. Escalators, Moving Walks, Wheelchair Lifts, and Stairway Lifts. Escalators, moving walks, wheelchair lifts, and stairway chair lifts shall comply with Article 250. 620-85. Ground-Fault Circuit-Interrupter Protection for Personnel. All 125-volt, single-phase, 15- and 20-ampere receptacles installed in machine rooms, machinery spaces, pits, and elevator car tops shall have groundfault circuit-interrupter protection. K. Overspeed 620-91. Overspeed Protection for Elevators. Under overhauling load conditions, a means shall be provided on the load side of each elevator power disconnecting means to prevent the elevator from attaining a speed equal to the governor tripping speed or a speed in excess of 125 percent of the elevator rated speed, whichever is the lesser. Overhauling load conditions shall include all loads up to rated elevator loads for freight elevators and all loads up to 125 percent of rated elevator loads for passenger elevators. 620-92. Motor-Generator Overspeed Device. Motor-generators driven by direct-current motors and used to supply direct current for the operation of elevator machine motors shall be provided with speed-limiting devices as required by Section 430-89(c) that will prevent the elevator from attaining at any time a speed of more than 125 percent of its rated speed. 620-101. Emergency Power. An elevator can be powered by an emergency power system, provided that when operating on such emergency power there is conformance with Section 620-91. 70-664 NATIONAL ELECTRICAL CODE Exception: Where the emergency power system is designed to operate only one elevator at a time, the energy absorption means, if required, shall be permitted on the line side of the disconnecting means, provided all other requirements of Section 620-91 are conformed to when operating any of the elevators the system might serve. (a) Other Building Loads. Other building loads, such as power and light that can be supplied by the emergency power system, shall not be considered as means of absorbing the regenerated energy for the purpose of conforming to Section 620-91, unless such loads are using their normal power from the emergency power system when it is activated. (b) Disconnecting Means. The disconnecting means required by Section 620-51 shall disconnect the emergency power service and the normal power service.