pulling 35mm 3 core

[odawire]

Hi, working on a new penthouse installation, needs a new supply cable from the basement, engineer has specified 35mm tails. Gonna need to pull in about 40 metres of 35mm 3 core swa, never handled this stuff before but im expecting it to be fairly heavy and not easy to bend, the run is pretty straight but cant be run surface, has to be in the plasterboard wall, and then a few bends when it hits the basement. Anyone have any experience of this, Im thinking me and a labourer for two days to get the cable point to point and will we be able to lift it easily? there is a hoist we can use to get it to the top floor. Thanks

 

[Knobhead]

Don’t know if anyone has noticed, it a penthouse supplied from the basement.
Mainly a vertical run, unless there’s a definition of a penthouse I’ve not come across. Last time I was in one it was a bit high up.
Three guys? The bloody lot will end up in the basement.

 

[Plonker 3]

Don’t know if anyone has noticed, it a penthouse supplied from the basement.
Mainly a vertical run, unless there’s a definition of a penthouse I’ve not come across. Last time I was in one it was a bit high up.
Three guys? The bloody lot will end up in the basement.

would be be fun watching them all on a different floor , cable on jacks on the top floor and no one watching it lol

 

[Rockingit]

Rockingit, it needs to be 3 core cable for main bonding purposes. The SWA's CSA will not comply for the installations main bonding connections, only as a CPC. The OP has been given a specified size by the projects electrical Engineer, so that's what he needs to provide!!

I assumed that was the case, but (without looking it up) is the armour csa of a 25mm not eq. to 16mm copper, or indeed whatever the prevailing adiabatic result is? Alternatively, why not just run a 2C plus E?? I'm not trying to suggest that he goes against a reasoned specification, just that at face value it does seem a little over engineered and worthy of an ask.

And a 40m run is *only* 78kg, so as I said, so long as they've had their weetabix they should be fine!

 

[Engineer54]

Well steel roughly needs to be 8.5 X that of a copper conductor, so doubtful. Besides on a new installation would you start messing around with adiabatic sizing, ...just not worth the hassle, and pretty pointless if the supply is PME/TNC-S...