As put forth, the answer is yes.Hi, Can an MCC bucket that both disconnect the control power and the three motor leads satisfy the requirements of 430.101 through 430.102?
And, can this MCC be out of sight as long as exception 430.102(B)(2) exception(b) is met? Thanks
430.102 (A) is dealing with the location of the controller and the location of the controller?s disconnect.
430.102 (B) is dealing with the location of the disconnect for the motor.
430.102 (B)(2) exception condition (b) would allow for the motor disconnect to be eliminated as long as 430.102 (A) is met.
The location of the controller to the motor
And the location of controller disconnect to the controller.
"And, can this MCC be out of sight as long as exception 430.102(B)(2) exception(b) is met? Thanks"
out of sight of what?
No.As long as the Motor control center is in sight of the motor?s controller or the motor controller has a disconnect within sight, and the locking requirements of 430.102 (B) (2) exception are provided.
IX. Disconnecting Means
430.101 General.
Part IX is intended to require disconnecting
means capable of disconnecting motors and controllers
from the circuit.
(FPN's omitted for brevity)
430.102 Location.
(A) Controller.
An individual disconnecting means shall
be provided for each controller and shall disconnect the
controller. The disconnecting means shall be located in
sight from the controller location.
(Exceptions omitted for brevity)
(B) Motor.
A disconnecting means shall be provided for a
motor in accordance with (B)(1) or (B)(2).
(1) Separate Motor Disconnect.
A disconnecting means
for the motor shall be located in sight from the motor location
and the driven machinery location.
(2) Controller Disconnect.
The controller disconnecting
means required in accordance with 430.102(A) shall be
permitted to serve as the disconnecting means for the motor
if it is in sight from the motor location and the driven
machinery location.
Exception to (1) and (2): The disconnecting means for the
motor shall not be required under either condition (a) or
condition (b), provided the controller disconnecting means
required in accordance with 430.102(A) is individually capable
of being locked in the open position. The provision
for locking or adding a lock to the controller 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.
(a) Where such a location of the disconnecting means
for the motor is impracticable or introduces additional or
increased hazards to persons or property
(b) In industrial installations, with written safety procedures,
where conditions of maintenance and supervision
ensure that only qualified persons service the equipment
As long as the Motor control center is in sight of the motor?s controller or the motor controller has a disconnect within sight, and the locking requirements of 430.102 (B) (2) exception are provided.
A typical MCC bucket for a motor contains the controller, i.e. the bucket is a motor starter... the main reason why multi-bucket equipment is called an Motor Control Center). Granted, trends have taken us to where MCC's are also used as more basic switchgear, so you do make a valid point in that the exception for the motor disconnecting means does not affect the in sight of requirement between the controller and its disconnecting means.I said the MCC had to be in sight of the motors controller not the motor.
Eliminating the local disconnect at the motor and using the MCC lockable disconnect as the controllers disconnect and the motors disconnect is ok as long as the MCC disconnect is in sight of the controller. If not the controller would need a lockable disconnect
The original poster stated that the MCC is disconnecting both the control conductors and the motor conductors.