Feeder from 480V switchgear to MCC in a separate building

[Isaiah]

I have a 480V CB located in a building approximately 100 feet from a new MCC in a prefabricated building. The MCC bus is rated 1200A and does not have a MCB; it’s MLO. Is this a code violation?


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[Buck Parrish]

What code cycle? There was some significant changes in 17 and 20 ....NEC 230.71
It's my understanding grouping of six switches is no longer allowed if it's in one unit, box or panel.
If it is six separate panels with six mains that's okay.
The NFPA doesn't want some one to be able to add or change a breaker by only turning off part of the equipment.

The manufacturers may have redesigned some panels to allow it by adding dividers. (Some one else will chime in on specifics)

 

[Isaiah]

It’s a 480V MCC with 7 sections and multiple combination starters, circuit breakers etc. It has a MCB rated 1200A and it’s fed from another 1200A CB in a remote building.


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[Isaiah]

I have a 480V CB located in a building approximately 100 feet from a new MCC in a prefabricated building. The MCC bus is rated 1200A and does not have a MCB; it’s MLO. Is this a code violation?


Sent from my iPhone using Tapatalk

I meant it DOES NOT have a MCB.

 

[david luchini]

I meant it DOES NOT have a MCB.

A disconnecting means is required for the feeder to the prefab building per NEC 225.31 and 225.32

 

[Isaiah]

A disconnecting means is required for the feeder to the prefab building per NEC 225.31 and 225

Thanks David. It seems exception 1 would apply in this case under section 225.32 (2020 NEC)

 

[tom baker]

Section 225.32 EX 1 allows the disconnecting means to be elsewhere on the premises,

• if under single management,
• documented safe switching procedures are used
• installation monitored by qualified individuals

 

[jap]

What code cycle? There was some significant changes in 17 and 20 ....NEC 230.71
It's my understanding grouping of six switches is no longer allowed if it's in one unit, box or panel.
If it is six separate panels with six mains that's okay.
The NFPA doesn't want some one to be able to add or change a breaker by only turning off part of the equipment.

The manufacturers may have redesigned some panels to allow it by adding dividers. (Some one else will chime in on specifics)

This is a Feeder not a service.

JAP>