MV Power cables armor

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Safy2004

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Hi! Every body
We want to use power cable 33 kV, XLPE,single core 1x400 mm2 to feed one substation outside the city, its long is about 6 kM, this cable will be buried under ground, it will be direct laid, blinded with cable laying sand 1m.
My question is there any relation between the armor and the way in which we lay the cable, in above case can we use armored cable?
All the standards that I have seen saying it is possible, but one engineer has a different opinion, and he said armored cables can be used in ducts and trenches but it can not be used in direct laid, blinded with cable lying sand... is that true?
Another question: If it is possible to use armored cable in our above case (buried with sand) is there any limitation in kind of formation (Flat formation - Trefoil formation)?
Thx in advanced
Regards,
Safy
 
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