main supply size ?

[nick611]

Any offers on this one ? I,ve got 26 x 2 bed flats . no real load/ gas heating/ plug in oven/gas hob, no elec showers. 2 x 4 person lifts. 2x 3 storey stairwells and 12 x corridoors. is 200 A 3 phase supply enough ? I/ve gone 100A for communials leaving 19A per flat. I know edf allow 12A per house on a site so maybe 600A will do. anyone offer some educated advice

 

[electrician4u]

what makes you think EDF allow 12A per house?that would be crazy! and to say no real load would be to predict what people are potentially going to use. ur seriously undersupplied imo

 

[telectrix]

at a minimum, i'd allow 40A per flat. so that's 26 x 40 = 1040A, split over 3 phases = 347A/phase. applying diversity, you might just scrape through @ 200A/phase.

 

[HandySparks]

what makes you think EDF allow 12A per house?that would be crazy!

Wouldn't surprise me.

Our house takes an average of about 800W, say 3A at 240V. Now this is averaged over 24 hours. So, suppose most of this is used over a period of 6 hours when we're doing cooking, washing, etc. That would give an average load of 12A during the 'high load' period.

The more houses being supplied, the 'smoother' will be the demand, and the lower the maximum demand per house that needs to be accommodated. There must be some learned papers about his sort of thing, presumably with the DNOs.

 

[Knobhead]

As an experiment I modified the CU in my flat. Everything fed through a single 16A RCBO. Ran it like that for a week without problem.
OK I use gas for heating and cooking, I prefer a bath so the shower hardly (never) ever gets used.

Back to the original question:
A reasonable diversity has to be worked out for each flat but that can be tempered by a utilisation factor.
No diversity is allowed for the lifts.

It beats me how someone could get a job like this when they clearly don’t know what they’re doing.

This smacks of a homework question.

 

[Knobhead]

Wouldn't surprise me.

Our house takes an average of about 800W, say 3A at 240V. Now this is averaged over 24 hours. So, suppose most of this is used over a period of 6 hours when we're doing cooking, washing, etc. That would give an average load of 12A during the 'high load' period.

The more houses being supplied, the 'smoother' will be the demand, and the lower the maximum demand per house that needs to be accommodated. There must be some learned papers about his sort of thing, presumably with the DNOs.

Have a look for requirements of sbstation design. I have a hard copy from UKPN, they are available on line.

There is also a paper on supplies to multi occupancy buildings covering sub distribution circuits within the building.

 

[nick611]

as an experiment i modified the cu in my flat. Everything fed through a single 16a rcbo. Ran it like that for a week without problem.
ok i use gas for heating and cooking, i prefer a bath so the shower hardly (never) ever gets used.

back to the original question:
a reasonable diversity has to be worked out for each flat but that can be tempered by a utilisation factor.
no diversity is allowed for the lifts.

it beats me how someone could get a job like this when they clearly don’t know what they’re doing.

this smacks of a homework question.

are you some kind of mug. Ive got 30 years in the game. Jib technician grade. Dosens of jobs over 150,000 grand electrical. If you cant give a decent post dont bother. Read the post after yours. Someone who knows his stuff. Not a condecending *********

 

[spark 68]

are you some kind of mug. Ive got 30 years in the game. Jib technician grade. Dosens of jobs over 150,000 grand electrical. If you cant give a decent post dont bother. Read the post after yours. Someone who knows his stuff. Not a condecending dick head

Ha ha, it was Tony whom also wrote that post

 

[Silly Sausage]

Ha ha, it was Tony whom also wrote that post

That Tony, what a muppet! hahahaha

 

[GMES]

are you some kind of mug. Ive got 30 years in the game. Jib technician grade. Dosens of jobs over 150,000 grand electrical. If you cant give a decent post dont bother. Read the post after yours. Someone who knows his stuff. Not a condecending dick head

Calm down lad I won't tolerate abusive language in the forum keep it civil please son or you will be out in the cold with the door locked:gunsmilie:

 

[Knobhead]

are you some kind of mug. Ive got 30 years in the game. Jib technician grade. Dosens of jobs over 150,000 grand electrical. If you cant give a decent post dont bother. Read the post after yours. Someone who knows his stuff. Not a condecending dick head

So just why are you asking a group of randoms how to do this job?

Have you looked for UKPN’s recommendations for flats? Contact your DNO they will provide a copy to the designer.

PS you've just confirmed my views on JIB grading.

 

[Silly Sausage]

Have you looked for UKPN’s recommendations for flats? Contact your DNO they will provide a copy to the designer.

I had a trawl earlier, lowest I found was 8kW for a small business premise.

It's a pity some people can't spot humorous (I using that word with a hint of the next...!) sarcasm now and again.
They must be a barrel of laughs trying to have a sensible discussion with! :smilielol5:

 

[Bobster]

are you some kind of mug. Ive got 30 years in the game. Jib technician grade. Dosens of jobs over 150,000 grand electrical. If you cant give a decent post dont bother. Read the post after yours. Someone who knows his stuff. Not a condecending dick head

I can guarantee that Tony knows his stuff on LV/MV/HV distribution


If you've so much experience in the feild why are you asking questions I would set as homework to an apprentice?

 

[nick611]

I can guarantee that Tony knows his stuff on LV/MV/HV distribution


If you've so much experience in the feild why are you asking questions I would set as homework to an apprentice?

sorry didn't mean to upset your girlfriend. I notice that for all the post ,no actual answer has come forth. I,m not fussed I'll just ask for 300A. Forums are for discussions not knitting circles sitting about slagging people off. Anyway cherio!I

 

[mechelec]

DNO will allow approx 1.5 KW ADMD (after diversity maximum demand) per flat if gas heated.
lifts may be a disturbing load depending on motor size, starter and frequency of start.
If you apply to DNO they will assist you.