UK best way for isolation

[L1Jay1]

ive been asked to rewire 5 flats , each flat is on a card meter, a new cu is to be installed in each flat to cover 3/4 circuits,
a new landlords main board is to be installed by the front door, can each flat be isolated from the main board or does each flat need individual isolation like it is now . What size run of cable to each flat 6mm or 10mm, only one flat has a electric shower , two flats have an electric oven. The flat with electric shower doesn't have electric oven.

 

[telectrix]

as a trainee you should not be expected to design this installation, or install it unsupervised. why have your employers not had the design calculated?

 

[L1Jay1]

as a trainee you should not be expected to design this installation, or install it unsupervised. why have your employers not had the design calculated?

Im no longer a trainee , i don't have any employes , im just asking the questions for advice.

 

[telectrix]

you need to update your profile then.

 

[L1Jay1]

you need to update your profile then.

ok thanks for reminding me, ill have to do later

 

[westward10]

If you connect them from the Landlords board the landlord will be paying for the electric as well as the tenants through their card meters.

 

[davesparks]

If you connect them from the Landlords board the landlord will be paying for the electric as well as the tenants through their card meters.

It looks like they are at the moment, all of that mess is fed from the T&E in the bottom right of the picture

 

[buzzlightyear]

Wow that landlord must invisable meters,
It's nice to see a tidy job.

 

[davesparks]

All of the flats could be fed from a single DB, however it should not be an MCB distribution board. For any hope of discrimination each flat needs to be fed via a fuse or possibly an MCCB.
With that in mind it will almost certainly be cheaper to install a switched fuse for each flat supply.
Then there is also the future convenience of operation to be considered, it will be far better to have seperate switchgear for each flat to allow any future work to be done without disturbing other flats.

The size of the supply for each flat needs to be calculated and the cable size calculated.
If you have been a trainee but aren't now then that implies you are now, and fairly recently, fully qualified so you should have the knowledge to carry out cable calculations far better than just guessing at 6/10 maybe.

 

[buzzlightyear]

i wonder where the F/A system feed from .and looking at 16mm tails feeding all that lot .

 

[telectrix]

ok thanks for reminding me, ill have to do later

pm sent. also read davesparks' post.

 

[L1Jay1]

i wonder where the F/A system feed from .and looking at 16mm tails feeding all that lot .

there isn't a FA system at the moment ,

 

[DPG]

Loving the plastic sheet screwed over the henleys. Didn't we see something very similar a couple of weeks ago on here?

 

[L1Jay1]

It looks like they are at the moment, all of that mess is fed from the T&E in the bottom right of the picture

It looks like they are at the moment, all of that mess is fed from the T&E in the bottom right of the picture

Lands supply amd meter .

 

[westward10]

Be interesting to know how the electric is being charged if tenants have card meters and it all runs through the Landlords meters.

 

[pc1966]

Well at least there is a main isolator.
Is that 10mm T&E from the main isolator?
Is the T&E earth used at all?!

 

[Zerax]

Be interesting to know how the electric is being charged if tenants have card meters and it all runs through the Landlords meters.

Reselling and making a profit ??

 

[snowhead]

Reselling and making a profit ??

That was stopped in 2003, in theory.

 

[pc1966]

I guess that a Ryefield board is the dog's proverbials for this sort of job, but not exactly cheap:

RYEFIELD TP6AHS60 TPN Board 60A Fuse Units - 6 Way

Product Description The Ryefield Tpn 6 Way Board 60A Fuse Units Tp6Ahs60 is used to provide separate circuit protection for each dwelling in a multiple dwelling setting. Provides 6 x single ways Suitable for up to 6 flats 60A Fuses L1/L2/L3 in a 2/2/2 combination Horizontal arrangement...

www.electricals247.co.uk

Mind you I doubt a MCCB board and matching breakers would be much cheaper either.
A consumer unit and MCBs would work, but as already pointed out you won't get much in the way of discrimination for any high current faults (typically only to 300-500A or similar), as well as the extra issues of safe isolation. Schneider normally have an on-line tool to calculate discrimination between breakers and/or fuses, but for now it seems down so they offer the guide book instead:

https://download.schneider-electric.com/files?p_Doc_Ref=LVPED318033EN

A set of basic switched fuses is another good suggestion already made, though you will have the issue of Henley block capacity to face!

 

[L1Jay1]

All of the flats could be fed from a single DB, however it should not be an MCB distribution board. For any hope of discrimination each flat needs to be fed via a fuse or possibly an MCCB.
With that in mind it will almost certainly be cheaper to install a switched fuse for each flat supply.
Then there is also the future convenience of operation to be considered, it will be far better to have seperate switchgear for each flat to allow any future work to be done without disturbing other flats.

The size of the supply for each flat needs to be calculated and the cable size calculated.
If you have been a trainee but aren't now then that implies you are now, and fairly recently, fully qualified so you should have the knowledge to carry out cable calculations far better than just guessing at 6/10 maybe.

Each flat will have its own consumer unit covering 3/4 circuits, there not large flats, more like studio flats, there will be a means of isolation in each flat via the flats cu , just wondering the best method of providing isolation at the main board, does there need to be individual isolation there to as it is now, each flat will be on its own MCB at the main board. Also at the landlords main board there will be the F/A and two landlords circuits for communal hallways. The card meters in the flats are sub meters, the landlord sells the cards to the tenants .