shall be equal to 125 percent of the motor nameplate full-load current rating of the largest motor, plus a quantity equal to the sum of each of the motor nameplate full-load current ratings of all remaining motors on the circuit, multiplied by the maximum percent duty cycle at which they can continuously operate.
(B) Locked-Rotor Current. The equivalent locked-rotor current rating shall be equal to the numerical sum of the locked-rotor current of the two largest motors plus
100 percent of the sum of the motor nameplate full- load current ratings of all the remaining motors on the circuit.
675.8 Disconnecting Means.
(A) Main Controller. A controller that is used to start and stop the complete machine shall meet all of the following requirements:
(1) An equivalent continuous current rating not less than specified in 675.7(A) or 675.22(A)
(2) A horsepower rating not less than the value from Table 430.251(A) and Table 430.251(B), based on the equivalent locked-rotor current specified in
675.7(B) or 675.22(B)
Exception: A listed molded case switch shall not require a horsepower rating.
(B) Main Disconnecting Means. The main disconnecting means for the machine shall provide overcurrent protection, shall be at the point of connection of electric power to the machine, or shall be visible and not more than 15 m (50 ft) from the machine, and shall be readily accessible and capable of being locked in the open position. The provision for locking or adding a lock to the disconnecting means shall be installed on or at the switch or circuit breaker used as the disconnecting means and shall remain in place with or without the lock installed. This disconnecting means shall have a horsepower and current rating not less than required for the main controller.
Exception No. 1: Circuit breakers without marked horse- power ratings shall be permitted in accordance with
430.109.
Exception No. 2: A listed molded case switch without marked horsepower ratings shall be permitted.
(C) Disconnecting Means for Individual Motors and Controllers. A disconnecting means shall be provided to simultaneously disconnect all ungrounded conductors for each motor and controller and shall be located as required by Article 430, Part IX. The disconnecting means shall not be required to be readily accessible.
675.9 Branch-Circuit Conductors. The branch-circuit conductors shall have an ampacity not less than specified in
675.7(A) or 675.22(A).
675.10 Several Motors on One Branch Circuit.
(A) Protection Required. Several motors, each not ex ceeding 2 hp rating, shall be permitted to be used on an irrigation machine circuit protected at not more than 30 amperes at 600 volts, nominal, or less, provided all of the following conditions are met:
(1) The full-load rating of any motor in the circuit shall not exceed 6 amperes.
(2) Each motor in the circuit shall have individual overload protection in accordance with 430.32.
(3) Taps to individual motors shall not be smaller than
14 AWG copper and not more than 7.5 m (25 ft) in
length.