Medium Voltage Splicing Application

[faresos]

I have a situation where we need to bring two electrical services lines (22.9KV) A &B for data center. Currently, there is only one service (Service A) to the site which coming from a circuit at the project site. The second line (B) will be available later, maybe in 3-years. There are two main transformers with switchgear are located in two underground vaults (Vault A &B). We need to provide a temporary service for side B until the permanant second line is available. What is the most economical approach we can take? The challenge is; when the second service is available, we do not want to interrupt the service to the building. Can we do splicing within the vault by using load brake elbows? Once the second service available, we can remove the elbows without interrupting the service?

Thanks,

 

[Hv&Lv]

I have a situation where we need to bring two electrical services lines (22.9KV) A &B for data center. Currently, there is only one service (Service A) to the site which coming from a circuit at the project site. The second line (B) will be available later, maybe in 3-years. There are two main transformers with switchgear are located in two underground vaults (Vault A &B). We need to provide a temporary service for side B until the permanant second line is available. What is the most economical approach we can take? The challenge is; when the second service is available, we do not want to interrupt the service to the building. Can we do splicing within the vault by using load brake elbows? Once the second service available, we can remove the elbows without interrupting the service?

Thanks,

I tried to follow the post, but it was a little confusing. Why splice? use load break elbows(275LR-W5X) and feed thru bars (274FT3-AB) 1 per phase. Stick an elbow arrestor on the extra end.

 

[faresos]

I tried to follow the post, but it was a little confusing. Why splice? use load break elbows(275LR-W5X) and feed thru bars (274FT3-AB) 1 per phase. Stick an elbow arrestor on the extra end.

Thanks for the reply...

I'm trying to understand your suggestion..

Are you suggesting to bring one line in (one per phase) into the feed thru bars as a junction point and feed out both transformers (A &B)? do I have to have the elbow arrestor?Does the feed thru bars and load break elbows needs to be in enclosure or it could be open in the vault?

Is there any diagram somewhere explain this installation? Thanks again

 

[Hv&Lv]

Thanks for the reply...

I'm trying to understand your suggestion..

Are you suggesting to bring one line in (one per phase) into the feed thru bars as a junction point and feed out both transformers (A &B)? do I have to have the elbow arrestor?Does the feed thru bars and load break elbows needs to be in enclosure or it could be open in the vault?

Is there any diagram somewhere explain this installation? Thanks again

Sorry, I forgot to post the link to the Thomas and Betts site.
http://www.tnb.com/util/docs/CA_SC_200ALB.pdf

Are the two transformers two individual single phase transformers? I am assuming so... The second line you are pulling in, it is going to be the same phase used for backfeeding purposes, or is it going to be a seperate phase for balancing? If it is the same phase, then use the seperable connectors and when the second line comes in just tie it all together with elbows and seperate wherever you want an opening point. What size wire are you using? For voltages that high, 200 amp connectors should be fine.