or more above the floor
Exception: Live parts of motors operating at more than
50 volts between terminals shall not require additional
guarding for stationary motors that have commutators,
collectors, and brush rigging located inside of motor-
end brackets and not conductively connected to supply
circuits operating at more than 150 volts to ground.
430.233 Guards for Attendants. Where live parts of mo tors or controllers operating at over 150 volts to ground are guarded against accidental contact only by location as specified in 430.232, and where adjustment or other attendance may be necessary during the operation of the apparatus, suitable insulating mats or platforms
shall be pro vided so that the attendant cannot readily
touch live parts unless standing on the mats or
platforms.
FPN: For working space, see 110.26 and 110.34.
XIII. Grounding — All Voltages
430.241 General. Part XIII specifies the grounding of ex- posed non-current-carrying metal parts, likely to become energized, of motor and controller frames to prevent a voltage aboveground in the event of accidental contact between energized parts and frames. Insulation, isolation, or guarding are suitable alternatives to grounding of motors under certain conditions.
430.242 Stationary Motors. The frames of stationary motors shall be grounded under any of the following conditions:
(1) Where supplied by metal-enclosed wiring
(2) Where in a wet location and not isolated or guarded
(3) If in a hazardous (classified) location
(4) If the motor operates with any terminal at over 150 volts to ground
Where the frame of the motor is not grounded, it shall' be permanently and effectively insulated from the ground.
430.243 Portable Motors. The frames of portable motors that operate over 150 volts to ground shall be guarded or grounded.
FPN No. 1: See 250.114(4) for grounding of portable ap- pliances in other than residential occupancies.
FPN No. 2: See 250.119(C) for color of equipment grounding conductor.
Exception No. 1: Listed motor-operated tools, listed motor-operated appliances, and listed motor-operated equipment shall not be required to be grounded where protected by a system of double insulation or its equivalent. Double-insulated equipment shall be distinctively marked.
Exception No. 2: Listed motor-operated tools, listed motor-operated appliances, and listed motor-operated equipment connected by a cord and attachment plug other than those required to be grounded in accordance with 250.114.
430.244 Controllers. Controller enclosures shall be con nected to the equipment grounding conductor regardless of voltage. Controller enclosures shall have means for attachment of an equipment grounding conductor termination in accordance with 250.8.
Exception: Enclosures attached to ungrounded portable equipment shall not be required to be grounded.
430.245 Method of Grounding. Connection to the equipment grounding conductor shall be done in the manner specified in Part VI of Article 250.
(A) Grounding Through Terminal Housings. Where the wiring to fixed motors is metal-enclosed cable or in metal raceways, junction boxes to house motor terminals shall be provided, and the armor of the cable or the metal raceways shall be connected to them in the manner specified in Article 250.
FPN: See 430.12(E) for equipment grounding connection means required at motor terminal housings.
(B)