fry80657

Hello there,

I have just started a job that used to be 6 offices which are now being turned into 6 flats. All flats located on the 1st floor. At this moment the meters and switch gear for all 6 flats is on the ground floor in the electrical cupboard. The 25mm tails for each supply go from the meter and terminate into a 60amp switch fuse. From the switch fuse a 16mm twin and earth cable is running up a riser into each respective consumer unit. Each flat will have a 9kw boiler 45amp MCB, 6kw cooker 32amp, sockets, lights, smoke alarm. So I have a few questions I would be very greatful if someone could help me with.

1.) Is the 16mm twin and earth supplying each flat sufficient for the circuit loads I have stated above? boiler 45A, cooker 32A, sockets 32A x2, lights 6A, smoke 6A?
2.) Is the 60amp switch sufficient for this supply or will I need to change it to a 80amp switch fuse?
3.) Is the 16mm twin and earth protected enough going to each flat or should I strip the all out and run Steel Wired Armoured?


Please help,
Thank you.

mollydog

First thing fry is talk American NEC, because your question is simple but your words dont make sense to most guys in here, its your slang, like I know earthing is grounding and we use standard not metric. If you can convert your questions you will get replies and a lot of professional help. If you just wanna know what size service, service conductors, grounding and bonding conductor your codes may be different than ours and your inspector will fail you. A basic load calculation is to take your load and divide by your service voltage but we also use demand factors here because we assume the load will not be 100% all the time. Hope this helps.

MechanicalDVR

Maybe just wait for a responce from the other side of the pond where they don't use the NEC.

mollydog

Another thing is if you can convert you have to list your loads in VA and we need the square footage (measured from the outside walls) and number of stories. Ask your AHJ (inspector) if American code is allowed or used as the standard where you live.

mollydog

At another quick glance I guess a "flat" is a dwelling ? Right off the bat the minimum service size for a dwelling is 100A

MechanicalDVR

"Hampshire" is England to the best of my knowledge.

Trimix-leccy

Wouldn't it help if he put Hampshire UK!!!!!!!!!!!!!

So

Max demand....look in the regs
is 16mm protected??????????mechanically, electrically???

Where is the Gas and water metering?
ditto stop taps>
is cpc big enough for Ze compliance?

Service fuse size and position?
Service type

TNS
TNC-S
loads of questions

Regulatory Reform [Fire} Act, Part P etc etc etc

Are you NIC, ECA or any one of the others?

Someone else will doubtless be along shortly to shoot me down in flames

regarding the USA answers [this post would be beter on the UK pages by the way]
Square floor area does not matter here
Inspection may not be required depending on the 'status' of the installer
We have a set of tables for calculating max demand

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TRIMIX...Deep down you know you want it! Trimix-leccy; pulling the envelope---not pushing it