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Amtech on underground cables

Hi,

Have an issue with amtech and since i'm not an expert , thought I better posted.

Was asked to do some calcs on the AC side of a solar farm but we cant decide on the cables and installation method. 90 deg XLPE is what I used to connect inverters with the main panel, this cable seems to be a 70mm if buried in ducts or 35mm if buried using BICC data. Not sure of the difference between these methods as Amtech describes them identically.

Also, for the submain, 2 x 240mm single cores per phase seem to handle the roughly 600A load though not sure if this should be PVC or PILC due to the long life cycle of the install.

No site report available for soil conditions therefore assumed the temperature @20C and resistivity @2.5k.m/W

Any input would be appreciated.

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0 Georgios Papageorgiou over 5 years ago

As far as I can tell both methods should be providing the same result as with bicc amtech will just change the rating factors..I've looked at how amtech calcs the bicc method and also manufacturers data for xlpe and the ccc is almost identical so this shouldn't be happening..

I've moved away from bicc since just to be on the safe side
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0 Georgios Papageorgiou over 5 years ago

As far as I can tell both methods should be providing the same result as with bicc amtech will just change the rating factors..I've looked at how amtech calcs the bicc method and also manufacturers data for xlpe and the ccc is almost identical so this shouldn't be happening..

I've moved away from bicc since just to be on the safe side
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Amtech on underground cables

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