Running 6 flats of one supply ?

[jackson81]

hello all....

i have a customer who is turning a pub into 5 flats and is also building a small house next door...

the pub has 3 phase and he is wanting to run all of the flats of the one supply and one meter as they will all be holidays homes, but all with there own consumer units in each flat..

is this possible ? or will it have to be split into 2 incoming supplys ??

alll help would be greatly appreciated !

many thanks

 

[UNG]

Don't see any reason why it can't be done depends on the size of the available supply and what equipment is being fitted in each ( shower, cooker, heating etc ). A couple of flats could be connected to each phase

 

[ian.settle1]

hello all....

i have a customer who is turning a pub into 5 flats and is also building a small house next door...

the pub has 3 phase and he is wanting to run all of the flats of the one supply and one meter as they will all be holidays homes, but all with there own consumer units in each flat..

is this possible ? or will it have to be split into 2 incoming supplys ??

alll help would be greatly appreciated !

many thanks

Fit a 3 phase DB at point of origin of supply and then supply each flat from this DB, but you will need to find out the total loading of of all flats to be on the safe side.

 

[jackson81]

many thanks for your help..

would a switched fuse be needed for each flat due to the meter tails been more than 3 meters in length ??

thanks again

would it be best to fit a high line board at orgin and come of that with the sub mains to each consumer unit ?

 

[ian.settle1]

many thanks for your help..

would a switched fuse be needed for each flat due to the meter tails been more than 3 meters in length ??

thanks again

would it be best to fit a high line board at orgin and come of that with the sub mains to each consumer unit ?

If you use a DB at point of origin why use a switched fuse?

 

[peteludman]

just an idear u could put a pay meter in each flat.
u cant over load the main feed cable because you should have a fuse on each phase.

this i like a conversation i had the other day, you will be best to put 3ph to each flat because if u split 1ph to each flat the only 1 was being used then the phases wont be balanced.
but rember to not put 2 phases in 1 room for 400V

 

[Darkwood]

If you use a DB at point of origin why use a switched fuse?

Mccb, or hrc fuses would be the best option as this is a way to achieve the needed discrimination as you wouldn't want your 40,50,60-amp mcb/rcbo tripping if any of the circuit developes a short in a flat as access may be limited.
If cost is flexible then a 8way mccb board should be the option but numerous isolators would still achieve the same result although a small busbar with them may be needed to eliminate all the tailing needed.
Depending on the cable and run rcd protection may be needed on the sub-mains as well and with a mccb board this can be incorperated into the mccb's

 

[ian.settle1]

Mccb, or hrc fuses would be the best option as this is a way to achieve the needed discrimination as you wouldn't want your 40,50,60-amp mcb/rcbo tripping if any of the circuit developes a short in a flat as access may be limited.
If cost is flexible then a 8way mccb board should be the option but numerous isolators would still achieve the same result although a small busbar with them may be needed to eliminate all the tailing needed.
Depending on the cable and run rcd protection may be needed on the sub-mains as well and with a mccb board this can be incorperated into the mccb's

You me lost darkwood, what I was saying is that if you fitted a 3 phase DB at the incoming mains with either MCBs or Fuses then why would you need to fit a switch fuse.

 

[Darkwood]

You me lost darkwood, what I was saying is that if you fitted a 3 phase DB at the incoming mains with either MCBs or Fuses then why would you need to fit a switch fuse.

Sorry was thinking you meant 3ph dist board with mcb's been used to supply submains (as this can have discrimination issues), my humble apologies now i assume you mean running all circuits back to this board without submains, all is clear now

 

[amicus]

I would agree with ian,once you have sorted the loadings out,and confirm the incomer can cope,put a tp&n dis board at service position and feed each flat individualy with say a 16.0mm swa 3 core,to a twin rcd unit in each flat.

 

[ian.settle1]

Sorry was thinking you meant 3ph dist board with mcb's been used to supply submains (as this can have discrimination issues), my humble apologies now i assume you mean running all circuits back to this board without submains, all is clear now

No that was what I was saying but when you design the installation you would need to design it so discrimination is taken into account, eg Using type D MCBs at point of origin or fuses supplying the sub-mains, with Type B at each DB off this DB.

It can be done as I have worked on lots of installations where section boards supply other DBs around buildings.