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rubber insulated cloth covered tinned copper submain cable in galv. conduit.

Legh Richardson
Had a look at an installation which has a submain running approximately 25m to supply a kitchen.

We thought umm this looks interesting, cut a slice off at the output of the switched fuse and re-terminated. The cloth, and rubber appears to be in reasonable condition for what appears to be nearly 70 years old. An insulation test at 500V gave a reasonable result (>500M) and a leakage test gave the same, 0.41mA.

The cable is out of date but appears to be still serviceable. It is not heavily used and the ambient temperature is generally quite low. I think I might advise that the cable is replaced by a newer edition or at least regularly checked every year. Has anybody got any other ideas?


Legh
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    If the insulation at both ends is still flexible and in intact, and it all tests out OK I'd stuggle to find a reason to condemn it. If it's survived 70-off years and conditions remain about the same I don't see it suddenly failing catestrophically any time soon. I'd certainly make a note about it (and your findings), maybe suggest a slightly shorter interval between inspection (maybe 5 years instead of 10?) but I wouldn't worry unduely.


      -  Andy.
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  • 0
    If the insulation at both ends is still flexible and in intact, and it all tests out OK I'd stuggle to find a reason to condemn it. If it's survived 70-off years and conditions remain about the same I don't see it suddenly failing catestrophically any time soon. I'd certainly make a note about it (and your findings), maybe suggest a slightly shorter interval between inspection (maybe 5 years instead of 10?) but I wouldn't worry unduely.


      -  Andy.
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