Discuss Vertical Consumer Unit in the UK Electrical Forum area at ElectriciansForums.net
So it is 200A at the moment! There are two main switches and two RCDs of 80A each plus additional MCBs separate from those.
I think the builder's electrician has looked at it and confirmed it cant fit in the space available. I wanrt to make sure that isnt just a cop out. Also, SPN have said that the incoming cable cant be adjacent to a boiler..news to me.Then you have a problem, and a really bad electrical design.
If the supply is 200A then the main switch needs to be rated for at least 200A as do those RCDs unless they have some form of 80A protection before them.
If the installation really needs 200A then 2x 80A RCD’s will be no good as that would only allow 160A!
Plus DNOs don't provide single phase supplies greater than 100A to domestic properties (not sure they will ever provide more than 100A SP) so the supply must be 3 phase, in which case you'll be having a much bigger consumer unit than anything you've seen in a regular house.
Have you actually had an electrician look at this?
the chances it needs a 200 amp supply allowing for diversity is almost impossible in a normal sized house which from your description this must be, anyhow you will not get bigger than a 100 amp single phase supply anywhere and if you want 3 phase there will be questions that have to be answered. I have a feeling we are dealing with an inexperienced electrician who has added up all the MCB sizes and got close to 200, it doesn't work that way, I very much doubt you will hit 80 amps, even with an electric hob, oven and shower.Its a 3.5 bed/ 1 living room/1 bath/kitchen/1Wc house.
I've a (large, with private water treatment, ground source heating, workshops....) house I built in Devon many years ago - by the 'add it all up' principle I think from memory it was well into the 5-600's. By diversity this fell to something like 350A. It's been sat on a 100A fuse (nb, with full knowledge of the local DNO engineer as we had to get a pole TX installed for it) since forever with zero ill effects at all.the chances it needs a 200 amp supply allowing for diversity is almost impossible in a normal sized house which from your description this must be, anyhow you will not get bigger than a 100 amp single phase supply anywhere and if you want 3 phase there will be questions that have to be answered. I have a feeling we are dealing with an inexperienced electrician who has added up all the MCB sizes and got close to 200, it doesn't work that way, I very much doubt you will hit 80 amps, even with an electric hob, oven and shower.
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