Calculating Cable Size for Ring Circuit

[Pete999]

I have but I cant fit small CU's all over the stand, and if i tried to do it in one run its 150m so therefore a 25mm SWA is needed, which obviously inst viable for a few sockets.
Maybe didn't explain it better before but in one stand they are asking for 40 sockets, 8 circuits, 5 sockets each. Wouldn't be keen sticking 8 consumer units in a football stand, you know what'd turn into.

Thanks

Your original post mentioned 5 sockets on a RFC now it's 40 sockets across 8 RFCs 1 consumers unit would d0, 8 RFCs wired from that CU, don't mean to be disrespectful Mate, but are you sure you are suitably experience to do this type of work?

 

[Deleted member 26818]

Making off SWA into sockets is not a big deal.
Just make the gland off into 20mm couplers.

 

[appspark]

Hi - I suggest to get the load fully tied down first (a written spec) as food stalls may fully load each outlet with water boilers and cookers etc. If so a domestic rfc isn't really going to cut the mustard, I reckon.

To be honest at best i think they're thinking more hotdog warmer etc than full setup, otherwise in that case i'd run a 63A supply to an isolator.
The unfortunate part of this job is that its design and build so they wont commit themselves to a spec. At the end of the day if they try and pull much more than 32A after i'm gone the breaker will go anyway.

 

[Deleted member 26818]

What CSA do you get if you calculate for a radial?

 

[appspark]

Your original post mentioned 5 sockets on a RFC now it's 40 sockets across 8 RFCs 1 consumers unit would d0, 8 RFCs wired from that CU, don't mean to be disrespectful Mate, but are you sure you are suitably experience to do this type of work?

I did say i didn't think i'd explained it very well Pete. the problem is that yes i will have 8 RFC doing 40 total sockets, I still have the issue that an RFC is still going to be 300m on the longest.
I'm more than capable of doing the work i was only looking for a nudge in the direction of how to calculate cable size on a RFC, i dint ask anyone to do it for me or even pass me a link to a page, just a nudge in the right direction.

 

[appspark]

What CSA do you get if you calculate for a radial?

Its like 25mm or something daft, 6mm is ok for sockets, 25mm is pushing it

 

[Pete999]

I did say i didn't think i'd explained it very well Pete. the problem is that yes i will have 8 RFC doing 40 total sockets, I still have the issue that an RFC is still going to be 300m on the longest.
I'm more than capable of doing the work i was only looking for a nudge in the direction of how to calculate cable size on a RFC, i dint ask anyone to do it for me or even pass me a link to a page, just a nudge in the right direction.

I think to be able to draw any conclusions Mate we would need a more detailed schedule, supply information, details of the load requirements etc, to avoid any bad feelings I'm going to retire from this thread.

 

[Pete999]

I did say i didn't think i'd explained it very well Pete. the problem is that yes i will have 8 RFC doing 40 total sockets, I still have the issue that an RFC is still going to be 300m on the longest.
I'm more than capable of doing the work i was only looking for a nudge in the direction of how to calculate cable size on a RFC, i dint ask anyone to do it for me or even pass me a link to a page, just a nudge in the right direction.

I think to be able to draw any conclusions Mate we would need a more detailed schedule, supply information, details of the load requirements etc, you mentioned that the client may need to add things at a later stage, or that's how I read your first post, this type of installation method, of suggesting that the best way forward is to install some sockets, and see what transpires at a later date is not the best way forward, I take it that this is not a Premiership Club you are working for, more than likely a lower tier outfit.
I think your best second bet would be to tie the management down to what they actually require now and future proof for the future, and base your cable calculations on the results supplied by them, it maybe that RFCs are not the ideal answer to their needs, there will be a lot of other requirements that will need consideration, RCD Protection, earthing methods, which would make your request for a "nudge in the right direction" for sizing a suitable cable for a RFC pale into insignificance, a proper design is required Mate. it will save the AFC you are working for money in the long run, with that I will exit this thread, as I have gotten myself in trouble before saying what I think and speaking my mind, good luck with your project whatever you decide.

 

[Spoon]

Again, I'm probably misreading this but, am I correct in that they have asked you to design these 8 RFC (40 sockets) but are not willing to clarify what is being plugged into them?

 

[appspark]

I think to be able to draw any conclusions Mate we would need a more detailed schedule, supply information, details of the load requirements etc, to avoid any bad feelings I'm going to retire from this thread.

No problem, thanks for your input.