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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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    assuming you mean the loop test for something protected only  by a 160A fuse is 0.76 of an ohm, and it is not just  a case of cleaning up the glands, then it might be fun to work out how long it would take to blow the fuse if there was a solid short at that point.  The earthing was presumably once better than this and is corroding out.

    The IR results indicate not just failure of the jacket and ingress to the armour, but also damp has got a path to the live cores, so presumably a joint box has failed and is sizzling like a chip shop..

    There is clearly a problem, which best case is hopefully only near to  one end, but in any case something will need replacement. If you decide not to repair or replace it just yet, and to wait for it to go bang, you should certainly  start saving up to do so pretty soon.
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  • 0
    assuming you mean the loop test for something protected only  by a 160A fuse is 0.76 of an ohm, and it is not just  a case of cleaning up the glands, then it might be fun to work out how long it would take to blow the fuse if there was a solid short at that point.  The earthing was presumably once better than this and is corroding out.

    The IR results indicate not just failure of the jacket and ingress to the armour, but also damp has got a path to the live cores, so presumably a joint box has failed and is sizzling like a chip shop..

    There is clearly a problem, which best case is hopefully only near to  one end, but in any case something will need replacement. If you decide not to repair or replace it just yet, and to wait for it to go bang, you should certainly  start saving up to do so pretty soon.
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