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OSG 7.3.2 cables in walls and partitions

hertzal123
In the above,item d states the cables can be protected by earthed steel conduit or,

Item e then states :mechanical protection sufficient to prevent penetration of nails,etc,

but no mention of earthing..

I have a situation with a short 200mm horizontal run outside the zones.

I could slide a lenght of earthed conduit over,but then the earth connection would be plastered

over and could not be inspected.

If I treat the conduit as mechanical protection,it would not need earthing?

Wondered what others would do.

                                                        Regards,Hz

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    If I treat the conduit as mechanical protection,it would not need earthing?



    Correct - if the (sheathed) cable can't be pierced by a nail/screw then the (metal) mechanical protection isn't going to be made live - so doesn't need earthing.


    But as Graham points out, in these days of nail guns etc, using a purely mechanical means of protection is far from straight forward.


    Perhaps easier to use a cable type that has an in-built surrounding c.p.c. - e.g. BS 8436.


      - Andy.
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  • 0

    If I treat the conduit as mechanical protection,it would not need earthing?



    Correct - if the (sheathed) cable can't be pierced by a nail/screw then the (metal) mechanical protection isn't going to be made live - so doesn't need earthing.


    But as Graham points out, in these days of nail guns etc, using a purely mechanical means of protection is far from straight forward.


    Perhaps easier to use a cable type that has an in-built surrounding c.p.c. - e.g. BS 8436.


      - Andy.
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