Grouping Service Disconnects 2015 IRC

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nizak

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I've got a job where due to physical outdoor space I need to install an additional main breaker load center inside the house.

Current exterior set up is meter base with Service rated ATS directly next to it.

Increased load will require a second load center be installed indoors in the basement directly behind the meter base.

I'm working under the 2015 IRC and don't see anywhere in there where the disconnects require being grouped.

Would this install be code compliant?
 
nizak said:
I've got a job where due to physical outdoor space I need to install an additional main breaker load center inside the house.

Current exterior set up is meter base with Service rated ATS directly next to it.

Increased load will require a second load center be installed indoors in the basement directly behind the meter base.

I'm working under the 2015 IRC and don't see anywhere in there where the disconnects require being grouped.

Would this install be code compliant?
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What is feeding the 2nd load center? Is it fed from the 1st load center?
 
For 1 and 2 family residential electrical we follow the 2015 IRC. For all other we follow the NEC.

Both the ATS and the 2nd load center are fed from a 320/400A Utility meter socket.

Only the load center that's fed from the ATS will have back up power during an outage.

The 2nd load center( one being added) will supply loads not requiring back up.
 
nizak said:
For 1 and 2 family residential electrical we follow the 2015 IRC. For all other we follow the NEC.

Both the ATS and the 2nd load center are fed from a 320/400A Utility meter socket.

Only the load center that's fed from the ATS will have back up power during an outage.

The 2nd load center( one being added) will supply loads not requiring back up.
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Looks like you need to add a disconnect outside beside the ATS, which is a disconnect. Both disconnects need to be grouped.
 
Here is a link to a discussion on that topic in a building code forum.

IRC Electrical Code for Grouping of Disconnects

Discussion/Debate. This question is specific to residential electrical where the IRC was adopted and enforced including the electrical section. This is not an NEC question, this is specifically an IRC question so please reference the IRC for your opinion. Scenario: A homeowner has an...
www.thebuildingcodeforum.com
 
augie47 said:
Here is a link to a discussion on that topic in a building code forum.

IRC Electrical Code for Grouping of Disconnects

Discussion/Debate. This question is specific to residential electrical where the IRC was adopted and enforced including the electrical section. This is not an NEC question, this is specifically an IRC question so please reference the IRC for your opinion. Scenario: A homeowner has an...
www.thebuildingcodeforum.com
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Unable to access that site.

Thanks .
 
I was able to access it now.

I see it was a point of contention some years back and the IRC still has not properly addressed it.
 
nizak said:
I was able to access it now.

I see it was a point of contention some years back and the IRC still has not properly addressed it.
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There is an exception for dwelling units that would allow not grouping of the disconnects in this example.
'400A service with dual lugs in the meter. One set of SE conductors from the meter to a 200A MB panel in the house. One set of SE conductors to a 200A MB panel in a garage or separate building. So this would be a single drop with two sets of SE conductors allowed under the exception. Each 200A MB panel would be the disconnect for their respective SE conductors. No disconnect required at the meter'

The problem you have is, you already have a disconnect outside, the ATS. Since you have one there already, if you add another disconnect it would have to be grouped with the original one.
 
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