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Water ingress in SWA.

Former Community Member
Former Community Member
High all I am new to this forum.

I have a 95mm 4 core SWA cable running to 6 Buildings which are along way apart.

This cable is fed from a feeder pillar up hill to 5 underground joints.

Within the feeder pillar the cable is underground feeding up to 3 160amp fuses and the neutral bar.

On the cable entry water is seeping up the cable and thru the gland causing rusting of the connection plate.

When loop tested at each DB the reading range from 0.29 to 0.76.

But when IR tested L1 is 0.76 L2 is 0.26 L3 is 2.89meg 

Do I need to replace the cable.
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    I'm inclined to agree - on all but the shortest  run of small cross-section (so cheap to replace) cable, the saving from direct burial is probably a false economy - and can greatly increase the risk of damage to the outer sheath from day one, unless the backfilling is very conscientiously done (whereupon cost is similar). I know the instructions always say backfill material free of flints and so forth but as soon as no one is looking, almost anything might get mashed in. However, here I think  it is too late for such advise.


    Even if it is ingress at a joint, it sounds like a length from the joint to the wet end will need to be dug up.

    I have seen schemes for blowing gas between the cores of the loose filled network cables, but SWA has no such void.
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  • 0
    I'm inclined to agree - on all but the shortest  run of small cross-section (so cheap to replace) cable, the saving from direct burial is probably a false economy - and can greatly increase the risk of damage to the outer sheath from day one, unless the backfilling is very conscientiously done (whereupon cost is similar). I know the instructions always say backfill material free of flints and so forth but as soon as no one is looking, almost anything might get mashed in. However, here I think  it is too late for such advise.


    Even if it is ingress at a joint, it sounds like a length from the joint to the wet end will need to be dug up.

    I have seen schemes for blowing gas between the cores of the loose filled network cables, but SWA has no such void.
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