Q for sparkies - new supply

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Originally Posted by Vern

Your calcs are for single phase, my guesstimate is split over two phases, if running two phase, who is going to use 100a per phase? Split the load.
Yes its a rural thing, he will have a swer line I presume, they can take a second tap from the transformer to produce 2x 240v, or he has a 2 phase transformer across the road.

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It was for three phase actually, and was only done as an example as I saw 100a and three phase being talked about.

Single phase 100a would be a 500mm2 cu or 400mm2 ALU which is ridiculous for a house haha

For arguments sake if you went three phase 32a it would be a 70mm2 cu or 120mm2 Al. Unbalanced of course.

Maybe you should whip out your calc app and see what your split phase tells you.

Definitely agree about using aluminium conductors, so much cheaper and modern aluminium cables aren't too bad to work with.

Quote:

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Originally Posted by Vern

I just use my cable calc programs these days, been a looooong time since I have done it the old fashioned way:) not even sure where me as/3008 is anymore:(

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Same here, it's too easy to use an app these days. Much faster if you have to do the volt drop for a ton of cable runs on a job.

Sorry double post.

Sorry your right, had way to many :beer: today.
I have just been guessing, I need to punch it into the computer when in the office next. Would like a good phone app though.
I use aluminium a bit nowadays, much easier, lighter, and cost effective, and the new bimetal lugs make it easy.

Quote:

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Originally Posted by Vern

Sorry your right, had way to many :beer: today.
I have just been guessing, I need to punch it into the computer when in the office next. Would like a good phone app though.
I use aluminium a bit nowadays, much easier, lighter, and cost effective, and the new bimetal lugs make it easy.

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Shear bolt bi metal lugs are awesome, so much easier then using the 12 and 60 ton crimper and there associated dies.

As for app, look on the play store for GenCalc, made by General Cable. It costs a bit but definitely worth it.

Edit. Link attached
https://play.google.com/store/apps/d...lcable.gencalc
https://itunes.apple.com/nz/app/genc...09423'mt=8

The mob that I get my cable calc program from may do an app.
Yeah I only use the shear bolt ones, prior to that it was hand crimper, what a bugger that was, and messy:(

ok heard back from guy at tasnetworks (power company). it seems i am allowed to install my own pole on my property (obviously to standard). sparky is definitely playing funny buggers saying i cant so i'll be looking for another one.

tasnetworks say can span upto 35 metres from their pole on the street side of my boundary to my pole i put in but they will supply the span for free.

so next question what is impact this 35 metres less for the wires to run underground has on their sizing. im guessing it will bring it down to the 280-290m. is there a website people use which has trustable figures which give you cable size? then i can be in some position to work out if putting the pole in is economically worthwhile.

vern - there is no talk of a pit, it says they will install 2 LV fuses 80A to the pole. the 10% voltage drop was what sparky told me, i thought it was 5% allowed to the house and 5% within myself but its not the first bit of dud info he's given me. once i get a sparky will enquire on the use of aluminium cable too.

You seem adamant on having a pole to save you probably $500, that pole is and will be your responsibility for ever, I personally would go underground the whole way. Have you had a price on the cable yet?
Have you considered supplying and laying it yourself? Its not a great job:)
I'm not up on tassie's requirements, but we can only go straight to a pole if its on private land, other wise a service pit must be installed at the property boundary.

As I said, get me a fairly close distance, and I can let you know what cable to use, and even get a cost.
Where is the said property?

vern - i'm down the bottom of tassie, well past hobart.

yeah regs must be different here. my neighbour has the same setup i am talking about but only half the distance to cover - ie pole on boundary to private pole then underground to house. i've done this exact setup before too.

i'm not determined to put the pole in, now that i know it is still possible and i am allowed to put it i can run the ruler across the equation to help in the decision.

as for exact distances, as the crow flies it is 298 metres. but i am adding 30 metres on to it as it is rises up a hill. so that's where i come up with 330 metres. now if the pole goes in it gets 35 metres taken off it!

i am not in tassie at the moment to run a wheel across it.

last place i had i helped the sparky run 130 metres underground which had a few bends and some right angles in it so was a bit painful. this might not be much worse as it is pretty much a straight line aside from the vertical element which may help. i've got my own excavator so i'll dig the trench myself or get my neighbour to so cost is next to $0 aside from materials.

Dover, south port area?

Well if you have your own machine, lay it yourself:)
With those figures I can let you know what size, will work it out tomorrow. I will work on 300m, now I'm thinking minimum 150mm2 or 185mm2 in aluminium and probably 80mm conduit.