5 core SWA 120mm pvc cable

[davesparks]

Allowing a 2% vd you will scrape 80A on a 240. A 300mm will give you 90A.

I had a feeling 120 would be cutting it a bit close, my guess would be they are planning for a 63A circuit.

 

[westward10]

I had a feeling 120 would be cutting it a bit close, my guess would be they are planning for a 63A circuit.

You would need 185 for 63A.
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45A is about the limit for a 120 and 2%vd.

 

[buzzlightyear]

Me my self is not questioning what cable that he is using knowning the fact the op sould be asking the said spark i agree what some are saying
Its like asking is this string long enough.

 

[buzzer123]

Hello all
Thanks for your responses.

I believe that is 100 A total Split across three phases.
Client is talking to UK power networks about upgrading transformer to have 100 A from each phase.

What size cable would he need to future proof for that?
Thank you.

 

[buzzlightyear]

Op should you not ne asking you spark that qestion.

 

[Spoon]

What size cable would he need to future proof for that?

This is down to the electrician who will be signing off the design for this job.

 

[buzzer123]

Op should you not ne asking you spark that qestion.

Hi Buzz,

Thank you for your response.

I will ask him but it’s really good to get the opinions of several qualified expert‘s because several brains is better than one

 

[MJPD29]

No matter what you did this is going to be a very expensive cable. I'd ask the electrician to do the cable calcs for you to make sure

 

[davesparks]

Hello all
Thanks for your responses.

I believe that is 100 A total Split across three phases.
Client is talking to UK power networks about upgrading transformer to have 100 A from each phase.

What size cable would he need to future proof for that?
Thank you.

He needs to decide what is happening with UKPN first before worrying about what size of cable to get.
But before that you need to know what size supply is actually required.
There's no point getting a bigger transformer installed if the current supply will do the job.

To get 100A over that distance I would hazard a guess at 2x 120mm in parallel, but that is just a guess.

 

[westward10]

Get a specialist cable installation contractor in. Pulling cables over that distance is going to be some task. They will calculate it, pull it and connect it.

 

[buzzer123]

He needs to decide what is happening with UKPN first before worrying about what size of cable to get.
But before that you need to know what size supply is actually required.
There's no point getting a bigger transformer installed if the current supply will do the job.

To get 100A over that distance I would hazard a guess at 2x 120mm in parallel, but that is just a guess.

Thank you all for your responses, really appreciated. Regardless of the cable that will be finally specified I am still keen to know of the most cost effective electrical wholesalers from which to gain some prices any advice would be greatly appreciated

 

[westward10]

You are going to need to phone around. Try the internet first to find who deals with such sized cables, knowing the size will be handy. Large sizes and long lengths people should be competitive, ball park £8-10k that is without delivery because it ain't fitting in the back of a a Transit. That is for 120mm.

 

[davesparks]

Thank you all for your responses, really appreciated. Regardless of the cable that will be finally specified I am still keen to know of the most cost effective electrical wholesalers from which to gain some prices any advice would be greatly appreciated

Phone a few wholesalers or even cable suppliers such as Cleveland cables to get quotes.

It seems a bit weird to me that teh electricina won't supply it

 

[DPG]

Are we getting the full story here? Am I just being a bit suspicious?

 

[buzzer123]

The electrician will supply it - well he will put the client on his kew account as long as he pays as the cables not in his budget (and rightly so as I could not afford it either!!) nothing suspicious DPG trying to get names of some good wholesalers that's it - plain and simple - thought i could do better than kew………….. but also learning things from all you helpful folks so when I interact with the sparky I am in possession of actual knowledge - nothing I hate more than being pig ignorant and as I have said the clients become my friend over the years and do not want him to get stung by having someone spec it wrong and get it wrong. Will get a second quote for him now as some of you have made points this contractor did not mention and wont another opinion
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Are we getting the full story here? Am I just being a bit suspicious?

No your right to be suspicious I am an electrical double agent that lurks on forums asking questions that only a non qualified lay person would ask?? I am putting the cable underground mate - only want to dig it and do it once!! got a big reel organised from a mate to help distribute the cable and don't like messing about that why i thought I would ask for help.