supply & tails rcd

[sima24]

Hi all, could someone please give me some advice. I wiring some flats up and as its an old building their is currently no power to any floors. New supplies are being fitted in the basement (which is owned by a shop on the bottom floor) my question is about protecting the tails up to each flats cu. All 3 supplies will be 60a to an isolator which i will then take to a switch fuse. Im unsure on weather i can use an rcd as tails will be 20/30m to top cu. Can i fit a time delayed rcd to tails and comply? As if it tripped in the night their would be no access to basement. Is their any pracrical way to rcd protect the tails? Im thinking regardless of length that if i ran tails in swa rcd would not be needed. Thanks

 

[infinity]

supply & tails rcd

Are they buried <50mm in wall?

 

[sima24]

waiting on final drawings, but pretty sure they will be less than 50mm

 

[infinity]

supply &amp; tails rcd

Then you have no choice. 30mA or swa, or metallic trunking

 

[infinity]

supply &amp; tails rcd

Sorry completely contradicted myself there... Those are the choices

 

[sima24]

Are time delayed rcds ok for this situation?

 

[londonlec]

I use SWA for this.

 

[guest119]

Re: supply &amp; tails rcd

Time delay? Do you mean delayed till the shop opens? is it open Sundays?
Seriously but, you really cannot justify that.
You need your risers to comply with regs without the RCD.( or, plug in a faulty appliance and wait till Monday for re energising)

Risers are usually surface run or in accessible compartments, pipe chases shared with drainage drops or access panels in stairwells. Designers normally take all this into account.

16mm split concentric run on a riser tray top to bottom peeling off into the flats.

Boydy

 

[sima24]

Cheers