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Transformer Tails Sizing

fiftyhertz
Hi All,


I am trying to nail down sizing the tails from the TX into a switchpanel.


I have reviewed the the information in GN1 and understand the methods of installing to get the best current sharing capabilities. 


The issue is getting reasonbly sized AWA singles.


Example: 1500KVA TX - FLC 2165A.


Using Table 4D3 (to run to 70C) I cannot even get Trefoil 3 sets of 4 x 630mm2 (809A) cables to work, due to a grouping factor of 0.54?


How is the dealt with practically?
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    Mike,


    Thanks for the reply thats great.


    I wasnt aware that you could use the 2 dia cable rule when in a trench (Table 4C6 makes no mention). Is table 4C6 assuming that all cable are grouped together with 50mm in between? 


    This makes life a lot easier if you can disregard the grouping factor!


    Thanks

    411d5f92723f81871e29e5c36e0f1953-original-image.png
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  • 0
    Mike,


    Thanks for the reply thats great.


    I wasnt aware that you could use the 2 dia cable rule when in a trench (Table 4C6 makes no mention). Is table 4C6 assuming that all cable are grouped together with 50mm in between? 


    This makes life a lot easier if you can disregard the grouping factor!


    Thanks

    411d5f92723f81871e29e5c36e0f1953-original-image.png
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