Motor Controller/Motor Disconnect Means Location.

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Zane Bailey

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It appears that the 2005 NEC Handbook Art 430.102(A) requires that the location of the disconnect for controllers be with insight.
The Exception allows the disconnect to be installed remotely if over 600v.

430.102(B) requires the disconnect for motors to be installed within site.
The Exception allows the motor disconnect means to be installed remotely providing they comply with (a) or (b) and providing they comply with 430.102(A).

Can it be said that disconnect means for motors and controllers only be mounted remotely if 600v and over and impracticable of being mounted in the location of being insight of the motor and equipment?

the commentary expresses this.

Zane.
 
location of the controller

location of the controller

the commentary in the 2005 llustrated code indicates that the location of the disconnect, controller, must be within site of the equipment, unless the equipment is 600v and over. the code contradicts this, it does not indicate or specify the location of the controller.
 
Can it be said that disconnect means for motors and controllers only be mounted remotely if 600v and over and impracticable of being mounted in the location of being insight of the motor and equipment?
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I would say that is not accurate.

You may mount the disconnect for the motor remotely if it is capable of being locked. It could be the same disconnect as for the controller.

I don't see that the NEC cares where you mount the controller in respect to the motor.

It does seem to want to disconnect for the controller mounted within sight of the controller.

You could put another disconnect near the motor and have the unlockable disconnect and controller a long ways off.
 
2005 NEC, not the code (102 (A) and (B)

2005 NEC, not the code (102 (A) and (B)

2005 NEC commentary for 430-102(A) and (A), not the code (102 (A) and (B), indicate that the basic rules for this code are to have the motor disconnect, the controller disconnect within site of the machinerery or equipment, unless by the exeception it is 600v or over, and mounting it within site is impractible or causes a hazardous condition.

The code and the commentary seem to contradict each other.

What is the intent of the code.
 
The disconnect for the motor controller must be within site of the controller unless you meet exception #1 which is for motor circuits over 600 volts.

The disconnect for the motor itself must be located within site of the motor unless you meet the exception.

The exception for the motor disconnect is not limited to motor circuits over 600 volts like the exception for the controller.

Hope this helps.

Chris
 
Motor controller disconnect means

Motor controller disconnect means

I interpret this the same as you; however, the commentary says otherwise.

how can we correct this miss leading commentary, who do we contact?

What good is the illustrated code and commentary if it is incorrect?

Zane.
 
I just tool a look and I don't see any conflict between the commentary and the code rules in the 2005 handbook.
 
430.102(A) and 430.102(B)commentary

430.102(A) and 430.102(B)commentary

The conflict between the code and the commentary is . The code does not require the controller and the disconnect for the controller to be within site of the motor and the machinery except if the equipment is 600v or over provided that the disconnect is lockable and there is signage indicating where the controller and disconnect means is located. The commentary says that the basic rules require the disconnect and controller to be in site of the motor and machinery?

Zane.
 
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