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The cable is out of date but appears to be still serviceable.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

    I was asked to investigate kitchen sockets that had had been causing the fuses to blow. Unscrewed a socket, pulled it out as you do. The VRI insulation crumbled leaving bare wires - gingerly screwed the socket back in and .................Ran away!. (Some mistakenly state VIR). 


    Jaymack




    "Run away" you say?  - oh dear, lol. The quality of both the insulation and cloth covering at and around the terminals is still flexible as there is quite a bit of spare left in a rather large galvanized switch fused enclosure. That surplus allowed me to take a biopsy! .the cable available to be viewed appears to be healthy for its age; I can't say what the quality is within the conduit but as Zoom has stated it has its own protected micro climate.


    Legh

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  • 0

    Jaymack:

    I was asked to investigate kitchen sockets that had had been causing the fuses to blow. Unscrewed a socket, pulled it out as you do. The VRI insulation crumbled leaving bare wires - gingerly screwed the socket back in and .................Ran away!. (Some mistakenly state VIR). 


    Jaymack




    "Run away" you say?  - oh dear, lol. The quality of both the insulation and cloth covering at and around the terminals is still flexible as there is quite a bit of spare left in a rather large galvanized switch fused enclosure. That surplus allowed me to take a biopsy! .the cable available to be viewed appears to be healthy for its age; I can't say what the quality is within the conduit but as Zoom has stated it has its own protected micro climate.


    Legh

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