Supply cable for pub converted to 7 flats

[Mordecai Danisa]

Can you help out here,am on a project to wire a pub that has been converted to 7 flats and debating on the type of cable to use to power individual flat?Not too sure the ideal cable to use 25/16 sq.mm SWA 3C or any other.

 

[Manator]

Is the current supply enough for the expected demand? Is it 3 phase, if so what is the rating on each phase 60 amp 80 amp or 100 amp?

Why would the ground floor flats need 25mm the same as the top floor flats?

If you could give more information maybe we could help with some basic calculations has to what cable you should use.

 

[electrician786]

What's the size of the runs to the flats?

How much power will each flat need/use?

What supply is present at the moment?

Need some more info mate.

 

[NozSpark]

What's the supply?

What's the designed max demand of each flat?

What's the installation method?

How long is each submain going to be?

How are you going to protect the sub mains?

 

[Mordecai Danisa]

The supply is a 3PHASE and the pub had numerous activities going on in the top floors with the first floor having being a 4bedroom house and the loft was a boxing arena .Will check the main switch gear in the basement.But judging by the various numerous sub-boards feeding cold rooms and chillers ,the proposed 2bedroom apartments 7 should be adequate.Will get back to you tomorrow.

 

[batty]

How are the flats going to be heated?

 

[Evans Electric]

Are you supposed to be designing this job , Mordecai?

 

[Mordecai Danisa]

storage heaters is the proposed mode.

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Wiring up but have to come up with all options to enable all of them to be Electrically wired and ready for occupation by July.Partitioning almost complete now.

 

[batty]

So you are likely to need two supplies one off peak and one standard.

 

[binky]

I would be inclined to run individual supplies to each flat from main incoming point via individual switch fuses, unless I misundedrstood your question?

 

[Sidewinder]

I'd use a suitable DB / panel board at the origin with integral landlord metering and circuit breakers feeding each location for each supply via suitable sub mains to individual DB's in the flats with main bonding at each DB in case any tenant had a bit of a fiddle!

Mind my preference would be to get the DNO to drop a supply into each flat!

Until we know the total loads with diversity then we can't really advise the cable size as we don't know the load.

Also, we don't know the U values of the building to assess the heating load.

Do you have the heating requirement yet?

You could just allow around 40A per dwelling like the DNO do excluding the heating.

However, you could still need to "fuse" at 60/63/80A so you would need cable to cope with this.

I don't know the distances to calculate the cable sizes.

It seems like you are designing this rather than just installing?

IF you are designing then you have statute law duties under CDM which you must comply with.

It does not seem that you have enough info yet to comply with this?

 

[Mordecai Danisa]

Thanks very much for your inputs.The project seems to be changing by the day..For now they have dropped the idea of storage heaters and have applied for gas supply to individual flats.I submitted my calculations to YEDL and requested an option as Sidewinder's suggestion.

 

[Manator]

Gas supplies to 7 individual flats will probably be denied.