MCC incomer breaker requirement.

[pk107]

I am working on a project which has switchgear and MCC installed in same substation. MCC receives power from switchgear. Currently there is no disconnecting mean at MCC incomer. Client is insisting for incoming circuit breaker.
As per NEC or any other international standard, is there any clearly written statement which can justify my design.
Appreciate your help.

 

[petersonra]

I am working on a project which has switchgear and MCC installed in same substation. MCC receives power from switchgear. Currently there is no disconnecting mean at MCC incomer. Client is insisting for incoming circuit breaker.
As per NEC or any other international standard, is there any clearly written statement which can justify my design.
Appreciate your help.

as far as I know there is no such requirement in the NEC. however, that does not mean a customer specs won't require it. If they want it, add it and charge them accordingly. It is their money. They can spend it however they see fit.

 

[kingpb]

I am working on a project which has switchgear and MCC installed in same substation. MCC receives power from switchgear. Currently there is no disconnecting mean at MCC incomer. Client is insisting for incoming circuit breaker.
As per NEC or any other international standard, is there any clearly written statement which can justify my design.
Appreciate your help.

Typically when installed in same location/area there is no need since you can simply go open the feeder breaker. When installed such that the feeder is not easily accessible, some like to have a main at the MCC for convenience for disconnecting locally.

Either way it is more of a user preference. Like Bob said, if they want it, it's their money. If it's already built and your looking for a way to explain why you didn't provide them a main, simply say it's not required and your were trying to keep cost down.

 

[Jraef]

Even if they were in different buildings, you may not need to have a separate main under the right circumstances, so no, there is no NEC requirement. But I agree with the others, why fight it? If the MCC has Main Lugs Only, you might still be able to just add a section on the end and abandon the lugs in place (depending on size), or just remove the MLO section and replace it with an MCB section. You would not however be able to (legally) insert a main into the lug space.