8, a controller shall be marked with the control voltage.

430-123. Conductor Enclosures Adjacent to Motors. Flexible metal conduit or liquidtight flexible metal conduit not exceeding 6 feet (1.83 m) in length shall be permitted to be employed for raceway connection to a motor terminal enclosure. 430-124. Size of Conductors. Conductors supplying motors shall have an ampacity not less than the current at which the motor overload protective device(s) is selected to trip. 430-125. Motor Circuit Overcurrent Protection. (a) General. Each motor circuit shall include coordinated protection to automatically interrupt overload and fault currents in the motor, the motor circuit conductors, and the motor control apparatus. Exception: Where a motor is vital to operation of the plant and the motor should operate to failure if necessary to prevent a greater hazard to persons, the sensing device(s) is permitted to be connected to a supervised annunciator or alarm instead of interrupting the motor circuit. (b) Overload Protection. (1) Each motor shall be protected against dangerous heating due to motor overloads and failure to start by a thermal protector integral with the motor or external current-sensing devices, or both. (2) The secondary circuits of wound-rotor alternating-current motors including conductors, controllers, and resistors rated for the application shall be considered as protected against overcurrent by the motor overload protection means. (3) Operation of the overload interrupting device shall simultaneously disconnect all ungrounded conductors. (4) Overload sensing devices shall not automatically reset after trip unless resetting of the overload sensing device does not cause automatic restarting of the motor or there is no hazard to persons created by automatic restarting of the motor and its connected machinery. (c) Fault-Current Protection. (1) Fault-current protection shall be provided in each motor circuit by one of the following means: a. A circuit breaker of suitable type and rating so arranged that it can be serviced without hazard. The circuit breaker shall simultaneously disconnect all ungrounded conductors. The circuit breaker shall be permitted to sense the fault current by means of integral or external sensing elements. b. Fuses of a suitable type and rating placed in each ungrounded conductor. ARTICLE 430 - MOTOR CIRCUITS, CONTROLLERS 70-423 Fuses shall be used with suitable disconnecting means or they shall be of a type that can also serve as the disconnecting means. They shall be so arranged that they cannot be serviced while they are energized. (2) Fault-current interrupting devices shall not reclose the circuit automatically. Exception: Where circuits are exposed to transient faults and where automatic reclosing of the circuit does not create a hazard to persons. (3) Overload protection and fault-current protection shall be permitted to be provided by the same device. 430-126. Rating of Motor Control Apparatus. Motor controllers and motor branch-circuit disconnecting means shall have a continuous ampere rating not less than the current at which the overload protective device(s) is selected to trip. 430-127. Disconnecting Means. The controller disconnecting means shall be capable of being locked in the open position. K. Protection of Live Parts - All Voltages 430-131. General. Part K specifies that live parts shall be protected in a manner judged adequate for the hazard involved. 430-132. Where Required. Exposed live parts of motors and controllers operating at 50 volts or more between terminals shall be guarded against accidental contact by enclosure or by location as follows: (a) In a Room or Enclosure. By installation in a room or enclosure that is accessible only to qualified persons. (b) On a Suitable Balcony. By installation on a suitable balcony, gallery, or platform, so elevated and arranged as to exclude unqualified persons. (c) Elevation. By elevation 8 feet (2.44 m) or more above the floor. Exception: Stationary motors having 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. 430-133. Guards for Attendants. Where live parts of motors or controllers operating at over 150 volts to ground are guarded against accidental contact only by location as specified in Section 430-132, and where adjustment or other attendance may be necessary during the operation of the apparatus, suitable insulating mats or platforms shall be provided so that the attendant cannot readily touch live parts unless standing on the mats or platforms. (FPN): For working space, see Sections 110-16 and 110-34. 70-424 NATIONAL ELECTRICAL CODE L. Grounding - All Voltages 430-141. General. Part L specifies the grounding of exposed noncurrentcarrying metal parts, likely to become energized, of motor and controller frames to prevent a voltage above ground 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. 430-142. 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 as covered in Articles 500 through 517; (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. 430-143. Portable Motors. The frames of portable motors that operate at over 150 volts to ground shall be guarded or grounded. (FPN No. 1): See Section 250-45(d) for grounding of portable appliances in other than residential occupancies. (FPN No. 2): See Section 250-59(b) for color of grounding conductor. 430-144. Controllers. Controller enclosures shall be grounded regardless of voltage. Controller enclosures shall have means for attachment of an equipment grounding conductor termination in accordance with Section 250-113. Exception No. 1: Enclosures attached to ungrounded portable equipment. Exception No. 2: Lined covers of snap switches. 430-145. Method of Grounding. Where required, grounding shall be done in the manner specified in 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