MCC Disconnecting Means

[rlit]

NEC 2014 in 430.102- An MCC should have a means of disconnect within sight of the controller location. My interpretation is that this means the MCC must have a Main installed if the Switch feeding it is located outside and not within sight of the MCC. Am I correct on this or am I misinterpreting.

 

[petersonra]

NEC 2014 in 430.102- An MCC should have a means of disconnect within sight of the controller location. My interpretation is that this means the MCC must have a Main installed if the Switch feeding it is located outside and not within sight of the MCC. Am I correct on this or am I misinterpreting.

I don't see anything that about the MCC itself in this section at all.

 

[rlit]

I don't see anything that about the MCC itself in this section at all.

I think your right. 430.94 is the only thing that addesses this.

 

[petersonra]

I think your right. 430.94 is the only thing that addesses this.

430.94 is pretty clear that it does not have to be located in the MCC. In fact, I would argue there are good reasons to put it somewhere upstream since you will need some way to disconnect power to the MCC to work on it anyway, so the OCPD at the MCC is redundant.

 

[tom baker]

430.102 are the rules for motor disconnects, and that applies to an MCC if the motor is fed from the MCC.

 

[charlie b]

More to the point, I think, is that the individual buckets within an MCC are the controllers for the motors that they feed. Each of those controllers (i.e., each MCC bucket) is required to have a disconnecting means. 430.103 allows that disconnecting means to be in the same enclosure as the controller.