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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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    Do you know where the water is getting in? and how long it's been going on for? I might guess it's maybe more likely to be at one (or more) of the buried joints than along a cable length (although not impossible that the  cable sheath has been damaged somewhere along the line). The steel armour is galvanised so should withstand a little moisture for a while as long as the galvanising hasn't been physically damaged (like it usually is at terminations). It might be worth digging up just the joints, cutting them out and testing the individual sections of cable - it might be that just replacing the joints (perhaps with short lengths of extra cable and an extra through joint to make up the loss in the old joint) would salvage the situation without having to dig up the lot. Not an ideal solution perhaps - I believe PVC isn't good when left completely saturated in water, although XLPE is a bit better on that score - but insulation tests on the individual lengths of cable might give you an idea of the state of things.

      - Andy.
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  • 0
    Do you know where the water is getting in? and how long it's been going on for? I might guess it's maybe more likely to be at one (or more) of the buried joints than along a cable length (although not impossible that the  cable sheath has been damaged somewhere along the line). The steel armour is galvanised so should withstand a little moisture for a while as long as the galvanising hasn't been physically damaged (like it usually is at terminations). It might be worth digging up just the joints, cutting them out and testing the individual sections of cable - it might be that just replacing the joints (perhaps with short lengths of extra cable and an extra through joint to make up the loss in the old joint) would salvage the situation without having to dig up the lot. Not an ideal solution perhaps - I believe PVC isn't good when left completely saturated in water, although XLPE is a bit better on that score - but insulation tests on the individual lengths of cable might give you an idea of the state of things.

      - Andy.
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