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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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  • 0

    Does that need qualifying as to the circuit-breaker type and rating Andy?



    Probably no more so than any reduced c.p.c. situation - the quoted k²S² for BS 8436 foil screen are usually quite favourable compared with the reduced c.p.c.s on T&E for example - and often SWA armours won't comply with table 54.7 so will need some calculation to show BS 7671 compliance.  The "rules of thumb" for compliance for different situations are different of course, but that all seems a lot of detail for a "you might want to consider something like this as an option" reply.


      - Andy.
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  • 0

    Does that need qualifying as to the circuit-breaker type and rating Andy?



    Probably no more so than any reduced c.p.c. situation - the quoted k²S² for BS 8436 foil screen are usually quite favourable compared with the reduced c.p.c.s on T&E for example - and often SWA armours won't comply with table 54.7 so will need some calculation to show BS 7671 compliance.  The "rules of thumb" for compliance for different situations are different of course, but that all seems a lot of detail for a "you might want to consider something like this as an option" reply.


      - Andy.
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