3-phase wiring at home

[Carter]

Ha ha, I'm learning to love them!
...I did just get the impression that she was saying the Part P thing as that's all she knows to say, she didn't seem very well informed...no disrespect to her.

http://www.electriciansforums.net/business-related/1793-local-grant-funding-post13384.html#post13384


How y' doin' Wardie, as you can see I don't have much admiration for the wonks who dream these schemes and assume we all need to have our hands held. I'll say no more.

I had 3ph installed to run my scuba cylinder compressor adjacent to the shop and it cost me a packet for them to run all of 6 yards from the street service cable and a week later a series of almighty thumps under the paving outside were felt through the floor accompanied by the vaporous smell of boiling soil coming up through the floorboards as the new cable faulted between phases. 'kin apes! but how's this for a poss lateral solution?
What's the actual 3ph capacity required? Your building control cabs yes? you don't need to apply full loads to them just confirm operation of plc's and control gear. How about generating a local 3ph source from a single phase supply of sufficient capacity for you satisfactorily to test the units using an invertor/drive of suitable rating? Would that be easier or do you really need that 4c x 25mm or whatever?

 

[Wardie]

One day someone will just say to us electricians, "This is what you MUST do" and it will make sense and not contradict something else and we will all collapse with shock (non electrical type)

Doubt they'll tell you what you MUST do as they'll then be accountable, better for them to state 'grey' regulations and let you lot interperate it anyway you can. They then earn the money and are never held accountable! Oh what a glorious position!

Low voltage is below 1000v and above 50v AC

Extra low voltage is below 50v AC

Oh I see, forgive me, I'm used to working with mV, so that's what I call extra low voltage and 24v is low!

What's the actual 3ph capacity required? Your building control cabs yes? you don't need to apply full loads to them just confirm operation of plc's and control gear. How about generating a local 3ph source from a single phase supply of sufficient capacity for you satisfactorily to test the units using an invertor/drive of suitable rating? Would that be easier or do you really need that 4c x 25mm or whatever?

Hi Carter, Yeah I'm only building the 1 cabinet, for my prototype machine. I'm setting up a manufacturing company but I just want to get the first machine built and sequencing (which may take at least a couple of months) before I move into a unit. I'm just trying to stem the flow of outlay a bit at the moment!
I did think about generating local 3ph from a single phase supply but as I didn't have a single phase supply to the garage anyway the costs and hassle of doing all the work to get single phase in there, then getting the necessary equipment would've ended up about the same if not more. EDF are charging just under £1200 to make the connection under the pavement at the bottom of my garden, I dug the 4m long trench and laid the ducting etc. and even screwed the board to the wall in the garage ready for the meter...at their request (I think I'm in the wrong job!).

I'd like to be able to fit the single phase rings and 3ph runs round the garage then get a spark to make the connections and issue the cert. I just wasn't sure what to do it all in, swa or conduit/trunking. I'm not trying to cut corners or anything like that I just thought it would save a lot of the sparks time and therefore my money!

 

[ian.settle1]

What are you going to run of this might a 3 phase static converter do.

 

[Carter]

How's about something like this, much cheapniss!

6.8 kVA PETROL POWER GENERATOR 230 + 400 V 12.5 HP on eBay, also, Generators, Industrial Tools, Business, Office Industrial (end time 29-Aug-08 20:47:07 BST)

Knock up a double skin "hutch" for it behind your garage from a few aerated and high density blocks and you'll barely hear it.

 

[Wardie]

Yeah Carter I'm liking the look of the genny!
Really should've given something like that a bit of thought, I got so caught up with getting any sort of supply into the garage I didn't even stop to think about a generator

I've spent too much already to go back now

Still, I may be able to justify one somehow...

 

[Carter]

Know what it's like W, trying to see the wood fer the trees and it's easy to get one-tracked when everything is competing for attention.
I suppose one thing in favour of having a 3ph supply installed is the possibility of adding value to your property but that depends ultimately on one of the prospective purchasers having a use for it. At least with a genny you take the asset with you and can re-sell it unlike the installed option.