Multiple Services at 13.2KV

[msanbuen20]

We have a building that has multiple incoming utility company service feeders terminating at multiple locations within the building. Both services are rated at 13.2KV and terminate into 15 kv rated Switchgear. Each switchboard line up will be configured into a main-tie-main configuration. Per the NEC, are there any requirements for interconnections between the two services. We are assuming the code allows multiple service locations within a common complex.

 

[charlie b]

NEC 230.2(B)(2) allows you to have two separate services in your application. But I am confused by your question. First you say that the switchgear is configured "main-tie-main." That tells me that your two services are already connected to the same gear. Then you ask if it is required that the two services be interconnected. Can you clarify the question?

 

[msanbuen20]

NEC 230.2(B)(2) allows you to have two separate services in your application. But I am confused by your question. First you say that the switchgear is configured "main-tie-main." That tells me that your two services are already connected to the same gear. Then you ask if it is required that the two services be interconnected. Can you clarify the question?

We have 2 services and each switchgear is in a "main-tie-main" configuration.

 

[dlhoule]

msanbuen20
Electrical Engineer wrote:

We have 2 services and each switchgear is in a "main-tie-main"configuration.

Am I to understand that you will have part of the load for the complex on each service? ie. partially balanced between the 2.

If I understand correctly the switchgear "main-tie-main" will not allow you to interconnect the 2 services.

 

[charlie b]

You just said the same thing again. You didn't clarify anything.

You say, "main-tie-main." That tells me that Service 1 comes into one side of the gear, and that Service 2 comes into the other side of the gear. That is an "interconnection." But you ask if you are required to install an "interconnection." What other type of "interconnection" are you asking about?

Are you asking if you are required to set up the switchgear such that you can place the two utility sources in parallel? That answer would be "no."

Are you asking if you have to be able to connect the switchgear in one electrical room to the switchgear in another electrical room. That answer would also be "no."

What is your question?

 

[dlhoule]

You just said the same thing again. You didn't clarify anything.
I agree with you here.

You say, "main-tie-main." That tells me that Service 1 comes into one side of the gear, and that Service 2 comes into the other side of the gear. That is an "interconnection." But you ask if you are required to install an "interconnection." What other type of "interconnection" are you asking about?

Terminology: I think of an interconnection as being tied together as in parallel or in series. It would seem to me that the very nature of the gear would prevent any interconnection between the services. One or the other but not interconnected.

Please enlighten me once again.
Are you asking if you are required to set up the switchgear such that you can place the two utility sources in parallel? That answer would be "no."

Are you asking if you have to be able to connect the switchgear in one electrical room to the switchgear in another electrical room. That answer would also be "no."

What is your question?