DB schedules

[faisaluk]

Hi,

I m wondering whether if I can use 2.5mm cable for radial? If I can what is the radial circuit rule says in the 17th edition?

Any help on this, will be great full.

Thanks,
FA

 

[Spark123]

I think most of the circuits out there are radials?? You can use 2.5mm for radials providing 2.5mm as installed is adequate for the load and protective device.
Not sure what this has got to do with distribution board schedules though

 

[PrenticeBoyofDerry]

radials on 2.5mm, maximum floor coverage 50sq metres and protected by 20 amp breaker and RCD protection.

 

[Spark123]

What is the radial circuit for? I think the 50m² for socket circuits is just a rule of thumb.

 

[faisaluk]

The size of the area is more than 50sq metres. Yes I am using 20Amp MCB and RCD protection. It will services 10computers and 1 projector in the classroom.

any thoughts?

 

[RF Lighting]

This is a special installation in a commercial property. It is NOT a job for DIY.

Your only option is to employ the services of a competent electrician.

 

[Spark123]

High integrity earthing??

 

[RF Lighting]

Yep. Ten computers will have >10mA leakage current, so section 543.7 will apply.

Also, the RCD the OP intends to install is going to trip for fun.

 

[Taylortwocities]

Indeed, I wonder if the OP should be doing this work. The answers are well known to any competent electrician and/or by reference to the regs book.

Faisal. I hope you're well insured!

 

[PrenticeBoyofDerry]

would be best on a ring not a radial then for IT suite.
As said not DIY.

 

[faisaluk]

How would I project ten computers which have >10mA leakage current. I don't have 17th edition book. Could some one give me full details ont the section 543.7.


Thanks,
FA

 

[flameport]

How would I project ten computers which have >10mA leakage current. I don't have 17th edition book. Could some one give me full details ont the section 543.7.

No. The section in question is a full A4 page of text.

Regardless of that, as already stated, this is way beyond the scope of this forum, it is not DIY, and clearly you are not competent to be doing this work.

 

[Spark123]

And we'd only end up debating HIE for 20 odd pages too

 

[securespark]

Haven't we done this already?

 

[aptsys]

would be best on a ring not a radial then for IT suite.

Can you provide HIE using a ring without an additional earth cable?