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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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  • 0
    What about making the top or roof of the trench out load bearing steel mesh, as is often used for elevated walkways in plantrooms.

    This would allow almost unlimited ventilation and it might then be reasonable to consider the cables as being wall mounted rather than in an enclosed trench.


    This sort of thing Steel walkway


    No specific recomendation is made or implied for that particular brand. Link provided to show the TYPE of product to which I refer.
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  • 0
    What about making the top or roof of the trench out load bearing steel mesh, as is often used for elevated walkways in plantrooms.

    This would allow almost unlimited ventilation and it might then be reasonable to consider the cables as being wall mounted rather than in an enclosed trench.


    This sort of thing Steel walkway


    No specific recomendation is made or implied for that particular brand. Link provided to show the TYPE of product to which I refer.
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