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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The cable is out of date but appears to be still serviceable.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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    Legh Richardson:

    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    The cable is out of date but appears to be still serviceable.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, the enemy of this cable includes heat, causing brittleness of the insulation. This cable insulation seems to be still fit for purpose ......... at present; but if the user increases the loading? I would recommend that It is replaced asap. 


    Jaymack
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  • 0

    Legh Richardson:

    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    The cable is out of date but appears to be still serviceable.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, the enemy of this cable includes heat, causing brittleness of the insulation. This cable insulation seems to be still fit for purpose ......... at present; but if the user increases the loading? I would recommend that It is replaced asap. 


    Jaymack
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