twin and earth cabling size for commercial buildings

[JBW175]

Who said you could, that's why you'd go back to the main contractor for more information, and if it went in some sort of containment that would also change the outlook.

He’s the design consultant, he’s asking us for advice.

We’re giving him our opinions on how we interpret the regs and what to do in our experience.

What would you suggest?

 

[loz2754]

Table 4A2 number 40 gives ref method B, single or multiple cable in a building void.

 

[default]

He’s the design consultant, he’s asking us for advice.

We’re giving him our opinions on how we interpret the regs and what to do in our experience.

What would you suggest?

Yes. The advice is to get more information from the main contractor so you can make a more informed decision.

 

[davesparks]

And the fact it says clipped direct. I though that ment on the surface & visible,

Clipped direct means nothing about the visibility of the cable.
It means that the cable has been clipped directly to whatever it is installed on, no containment or anything else has been installed.

You may be confusing method C with clipped direct? Clipped direct is one of the methods which get grouped together as method C, cables embedded directly in plaster or in capping etc are also method C.