Primary connection for 8320GY/4800 120/240V 1 PH Transformer

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knorthouse

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Location
USA
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Automation
Hello All.

This is a question about the connection of the primary of an 8320GY/4800 120/240 1PH transformer. The transformer supplier has let us know that there only needs to be one conductor run from the Utility to the Transformer (Phase conductor). But I'm not sure then how a primary fault would be cleared if no EGC is also run. It's a fairly long run from the Utility to the new transformer location, so this is a concern. I'd appreciate any comments on this. Thank You.
 
knorthouse said:
Hello All.

This is a question about the connection of the primary of an 8320GY/4800 120/240 1PH transformer. The transformer supplier has let us know that there only needs to be one conductor run from the Utility to the Transformer (Phase conductor). But I'm not sure then how a primary fault would be cleared if no EGC is also run. It's a fairly long run from the Utility to the new transformer location, so this is a concern. I'd appreciate any comments on this. Thank You.
Click to expand...
It’s actually two conductors in one cable, the center conductor is surrounded by a braided ground which is used as the return path.
 
knorthouse said:
Hello All.
Click to expand...


knorthouse said:
IMG_6244.jpeg

This is a question about the connection of the primary of an 8320GY/4800 120/240 1PH transformer. The transformer supplier has let us know that there only needs to be one conductor run from the Utility to the Transformer (Phase conductor). But I'm not sure then how a primary fault would be cleared if no EGC is also run. It's a fairly long run from the Utility to the new transformer location, so this is a concern. I'd appreciate any comments on this. Thank You.
Click to expand...
 
On top of the concentric neutral, the utility follows different rules.

They do not have a separate neutral and ground; the transformer gets the 4800V hot, the concentric neutral, and that's it.

-Jonathan
 
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