Running of SWA, sub main

[kibble19]

Hi guys,

I am just trying to price a job up, which I am a bit unsure of. It is at a commercial premises, the supply I have got is 300a three phase, with ruffley 150a - 200a per phase already being used. The customer has asked me to run a supply, 300m (buried) for a 50kw load. It will supply staff living quarters, like a three storey house, and also possible expention in the future.
I have calculated the cable to 70mm2 SWA, 4core, with a 50mm2 earth. Do you think I should still put a earth rod in at the load side, house side?
Also a bit in unsure on protection, I calculated 125a 60947-2?
And then I was thinking of splitting the phases for each floor at the house, so ground floor L1, 1st floor L2 + 2nd floor L3?
Any help will me much appreciated

 

[telectrix]

first thoughts here are would it be better to have a separate new supply?

 

[kibble19]

Yea, the customer got quoted £30k or so from MEB!!

 

[loop3]

Price the job at 29k

 

[kibble19]

Haha, if only!

 

[telectrix]

i'll do it for 27.5k. bankers order to my offshore account.

 

[Knobhead]

What ever size cable it doesn’t matter. By asking on here you show you’re out of your depth completely. How did you get to quote for this job?

 

[MDJ]

I charge £50.00 an hour pricing for others, please PM me if you want help haha

 

[kibble19]

Was only asking a question, no need to be funny.
No I don't need it pricing thanks.

 

[kibble19]

I am a qualified electrician, and just trying to get a few small jobs going, before I start on my own next year. Only asking for a bit of advice

 

[rmc86uk]

In your original post you said 50Kv and now in your new post is 50kW?!

Sent from my GT-P7510 using Tapatalk 2

 

[Guitarist]

Just a warning mate. If you are qualified, but presumably working for someone else atm, do you have public liability in place just in case something were to go wrong?

 

[malcolmsanford]

Though nothing to add to the thread, I just want to know where you have been G, I never had a note from ya mum excusing you

 

[lauriehurman]

Kibble, I know nothing about 3-phase but I know if I were to use one phase for each floor of a dwelling then I would have 400v between Lines in the ceiling.

Laurie

 

[malcolmsanford]

Kibble, I know nothing about 3-phase but I know if I were to use one phase for each floor of a dwelling then I would have 400v between Lines in the ceiling.

Laurie

Think expansion on your part is needed here