twin and earth cabling size for commercial buildings

[davesparks]

Being commercial, will it be open to public? If it is then isn't thr consensus to use FP or similar?

Not quite, I think you may be thinking of LSF/LSOH type cables. LSF T&E exists.

 

[davesparks]

Clipped in a cavity, doesn't sound right. Think the installation method needs looking at a bit more closely.

Why not? What's wrong with cables being clipped in a cavity?

 

[Electro-tech]

Why not? What's wrong with cables being clipped in a cavity?

Depends on the purpose of the cavity & what else will end up in there, other than a cable route. Especially an external cavity wall.

 

[nicebutdim]

Depends on the purpose of the cavity & what else will end up in there, other than a cable route. Especially an external cavity wall.

To be fair to the OP, their comments indicate partition walls and not external cavities in which it would be nigh on impossible to clip cables.

 

[default]

To be fair to the OP, their comments indicate partition walls and not external cavities in which it would be nigh on impossible to clip cables.

Can it still be classed as clip direct. Maybe reference method G?. And if they're stud walls off the outer block work there's Surely going to be insulation.

 

[nicebutdim]

Can it still be classed as clip direct. Maybe reference method G?. And if they're stud walls off the outer block work there's Surely going to be insulation.

OP stated internal walls with no thermal insulation.

 

[default]

OP stated internal walls with no thermal insulation.

Still can't be classed as clipped direct. It's in a wall.

 

[cireland]

There is no exact reference method for this but I'd say clipped direct is closest.

 

[default]

Still can't be classed as clipped direct. It's in a wall.

And

There is no exact reference method for this but I'd say clipped direct is closest.

I'd say 103. If there's an EICR done in the future they either won't have the original test to go by or they'll look at it and think who ever tested it put down the wrong classification. I do sometimes think the installation references could do with one or two more. C'est La Vie

 

[cireland]

103 is with thermal insulation which greatly de-rates the cable.