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Aluminium/Copper Split Con

I have been trying to find either a table or current figures for split-con cable where the Live is 25mm2 Aluminium (single core) and both the Neutral (7 strand) and Earth (5 strand) are 16mm2 Copper. This split-con used by Scottish Power in their MANWEB area circa 2002. Google has not been my friend...

I am interested in current ratings for buried in the ground and within a hockey stick (in wall cavity) and the max BS88 fuse that could be used by the DNO to protect - currently an 80 amp.

Thanks.

Clive

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0 AJJewsbury over 5 years ago

Thanks Andy, but unfortunately it is for 25mm2 Aluminium x 25mm2 Cu x 25mm2 Cu whereas the cable I am looking for is 25mm2 Aluminium Live x 16mm2 Cu N and 25mm2 Cu Earth.

Are you sure? Aluminium has a higher resistance than copper per mm² so it would seem rather a waste of copper to make the copper N the same c.s.a. as the aluminium line. The data sheet says for the 25mm nominal size (presumably c.s.a. of the Al line conductor) both L and N have a resistance of 1.2 Ohms/km - which suggests to me the Al is a size larger than the Cu.

- Andy.
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0 AJJewsbury over 5 years ago

Thanks Andy, but unfortunately it is for 25mm2 Aluminium x 25mm2 Cu x 25mm2 Cu whereas the cable I am looking for is 25mm2 Aluminium Live x 16mm2 Cu N and 25mm2 Cu Earth.

Are you sure? Aluminium has a higher resistance than copper per mm² so it would seem rather a waste of copper to make the copper N the same c.s.a. as the aluminium line. The data sheet says for the 25mm nominal size (presumably c.s.a. of the Al line conductor) both L and N have a resistance of 1.2 Ohms/km - which suggests to me the Al is a size larger than the Cu.

- Andy.
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Aluminium/Copper Split Con

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