6/2/2010
Page 5 of 25
Electrobar 8-Bar Instruction Manual
005-1044-R8
with Table 430.52. Where two or more motors operate a single motion, the sum of their
nameplate current ratings shall be considered as that of a single motor.
2.6.(a).(ii):
Taps.
(1) Multiple Motors.
Where two or more motors are connected to the same branch circuit, each
tap conductor to an individual motor shall have an ampacity not less than one-third that of the
branch circuit. Each motor shall be protected from overload according to 610.43.
(2) Control Circuits.
Where taps to control circuits originate on the load side of a branch-circuit
protective device, each tap and piece of equipment shall be protected in accordance with 430.72.
(3) Brake Coils.
Taps without separate overcurrent protection shall be permitted to brake coils.
2.7:
610.43 Motor and Branch-Circuit Overload Protection:
Each motor, motor controller, and
branch-circuit conductor shall be protected from overload by one of the following means:
2.7.(a).(i):
A single motor shall be considered as protected where the branch-circuit overcurrent
device meets the rating requirement of Section 610.42.
2.7.(a).(ii):
Overload relay elements in each ungrounded circuit conductor, with all relay elements
protected from short circuit by the branch-circuit protection.
2.7.(a).(iii):
Thermal sensing devices, sensitive to motor temperature or to temperature and
current, that is thermally in contact with the motor winding(s). A hoist or trolley shall be
considered to be protected if the sensing device is connected in the hoist’s upper limit switch
circuit so as to prevent further hoisting during an overload condition of either motor.
Note: Please reference the National Electrical Code (NEC) for exemptions or additional
information on Disconnecting Means and Overcurrent Protection.
