single or 3 phase for house in the countyside

[lynnandrob]

hi guys

i think i might just be getting the hang of this now.(i hope this is right)just for the van i would need

1 x 32amp for the sockets (possibly 7 double sockets)
1 x 6amp for the lights (6/7 lights)
1 x 40amp for the shower
1 x 32amp for the cooker
1 x 16amp for the water heater
1 x 64amp for the heaters ( or 2 x 32amp)
making a total of 6 fuses in the fusebox and a total of 180amp for the van

the house would be
2 x 6amp for the lights (6amp upstairs 6amp downstairs)
2 x 32amp for the sockets (1 up 1 down)
1 x 40amp for the shower
1 x 32amp for the cooker
1 x 16amp for the water heater
then there are the 8 heaters 4 x 32amp
making a total of 292amp for the house =472amp for both
is that how you guys work it out??.

we may get a back boiler for the fire but would still have the heaters because of the speed of heating the house and water.

 

[malcolmsanford]

No Lynnandrob that is not how you work it out sorry. In my post 2 I tried to explain diversity to you a little. I really think it is time you bit the bullet and asked for professional help in this.

Not being funny if you had a real medical condition would you keep on the NHS health line right this is it now what is wrong, is it this, they would advise you to go to a doctor. I'm really advising you contact an electrician or as I said post your location and perhaps one of the lads here can help you.

 

[pblec]

red rag to a bull this, please justify your comments and bear in mind we are a technical forum so so 'because its always done that way doesn't wash'

i designed an instalation correctly i actualy used diversity and worked out potential loading purely because it was so close to when i did my course (how many of you use rule of thumb). i worked out that the supply could not cope with the demand so approached the supplier to do this before any work had taken place and followed the suppliers advice.

i did read your reply and yes thats how i now work out demand as applying diversity is irrelevant i. regardless of your opinion on domestic installers we are qualified to design and yes i posted up here the process i went through to highlight a problem i had found.

i am in my comfort zone for designing domestic, and could you please clarify if me allocating 1 phase for the house, 1 phase for the caravan and the 3rd phase being for storage heaters / spare is unsafe or may possibly be over cautious using the information provided.

yes its a discusion IQ invited me to reply, why the flames?

 

[malcolmsanford]

I'm not sure who your aiming for pblec but I assume I'm getting some of the fire, If you had a 3 phase supply and loaded the house, the caravan on a phase each, and then left last phase for the night storage heaters/spare then you are unbalancing the load, as the heaters will only work at night.

 

[pblec]

MS not at all sorry the reply button doesnt put the reply under the post its intended i'm aiming this at ezz.

but then his reply may not be aimed at me - i think it is though

as for the loading your probably bang on the other reason for the way i designed this is potential cross phase problems within the property / instalation, may be slightly over cautious but would make the install and future testing easy.

 

[IQ Electrical]

I think this highlights the problems with what I call 'crystal ball design'.

We all have our own ways of working and applying diversity, the competent electrician standing in the property, looking at the room sizes and armed with a DNO quotation for 1 and 3 phase supplies for that property will no doubt arrive at the best solution.

 

[ezzzekiel]

its intended i'm aiming this at ezz.

cant see how my reply could possibly cause offence as after offering advice you were obviously still struggling with the design, all i said was get someone to help you with the design stage then carry out the works yourself.

but as it stands you keep counting kettles and toasters and ill move along

 

[lynnandrob]

i think things have gone a bit astray here,im the one needing info on single/3phase consumption.but pblec and ezzze have got there wires crossed with who's who's.ill probaby get a sparky to work out the load and just hope it will be single phase.or get a seperate feed to the van.
thanks for all the input but im still none the wiser to how much the load will be.

 

[ezzzekiel]

work out what circuits you require,
example: 2x ring circuits at 32a + 2x lighting circuits at 6a etc etc
take the largest rated which is one of the 32a then add 40% of remainder so 32+6+6 x 0.40 = 17a + the original 32 = a demand of 49a. if after doing this simplified calc your over 100a then request 3 phase (you can calculate the amps needed per phase when you have the total)

after that its basic domestic wiring which i assume your confident with.

 

[pblec]

if your the householder then you'll obviuosly have your own electrician to design this install and provide your own advice. or find an architect to do the design draw up a plan then invite tenders. once you've got all of this then sort out your supply.

EZ gave you fantastic advice in his 1st post as the remainder have done the same all with differing perspectives, the main constant is you need to get a profesional in to specify this install and with your input designing this you will end up with the house you need. if you hadn't worked out yet its not a job that can be specified over the internet on a forum as we have so many variables and what ifs.