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Discuss Need a bit of help please in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. Grant collison
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    Grant collison EF Member

    Location:
    Essex
    Business Name:
    GRL
    hi all I have been given a
    3-phase + N supply for a 27kw industrial supply to a isolator , I’m awaiting a reply on what is going to be used on the output side but what sort of size cable and type would you all use as it’s enclosed in a thermal wall in conduit and it’s an industrial kitchen,
    Could someone please calculate the
    Size of cable and a suggestion of what type of cable to use please, many thanks all
     
    • Optimistic Optimistic x 3
  2. Murdoch
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    Murdoch Electrician's Arms

    Location:
    Woking
    Out of interest, what have you calculated you need?
     
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  3. Pete999
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    Pete999 Trusted Advisor

    Top Poster Of Month

    Location:
    Northampton
    Business Name:
    None
    Not with that sort of information
     
    • Like Like x 1
  4. wirepuller
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    wirepuller Trusted Advisor

    Location:
    south uk
    Going to be an expensive ball ache if the install is not right with that sort of load. I'd suggest asking a forum for a design is not ideal practice, if you are unable to design yourself it would be preferable to pass it on to someone who is.
     
    • Agree Agree x 7
  5. Lucien Nunes
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    Lucien Nunes Mercury Arc Rectifier Trusted Advisor

    Location:
    London
    Sort of medium size.
    An electrical one.

    Protip: For simple linear calculations use the same degree of precision when presenting the results of a calculation, as is present in the supplied data.
     
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  6. DPG
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    DPG Electrician's Arms

    Location:
    S Yorkshire
    Got to be a wind up this one.
     
    • Funny Funny x 1
  7. Strima
    Online

    Strima Electrician's Arms

    Location:
    St Neots
    My consultancy fees are £129.99 for the first hour then £89.99 per hour after that for design work.

    Cash in advance.
     
    • Like Like x 2
  8. TonyMitchell
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    TonyMitchell EF Member

    Location:
    Berkshire, UK
    @OP - your question looks like homework you can't be bothered to do. You will get a better forum response if you show your calculations, thoughts and reasonings. Someone then may be prepared to look it over and comment.
     
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  9. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    or cheques made out to Care at Strima's House. if that won't fit on the cheque just use the initials .....C.A.S.H.
     
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  10. Strima
    Online

    Strima Electrician's Arms

    Location:
    St Neots
    My carer says I might be let out on my own next week as the charges have been dropped...
     
  11. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    had my charges droppes as well. was arrested by a very attractive wpc. she said"anything you say will be taken down" i said "knickers".
     
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  12. Grant collison
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    Grant collison EF Member

    Location:
    Essex
    Business Name:
    GRL
    Well sounds like an asshole group to be honest
     
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  13. DPG
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    DPG Electrician's Arms

    Location:
    S Yorkshire
    Could you clarify what you mean - you're sentence structure and grammar isn't very good here.
     
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  14. SparkyChick
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    SparkyChick Making a banana smoothy for my fave gorilla Electrician's Arms

    Location:
    South Wales
    Business Name:
    SparkyChick
    And I think you're missing the point of what the guys have said.

    Come on and ask 'Work this out for me' and we'll all generally not pay too much attention because either (a) it's a homework question or (b) you just can't be arsed to put any effort in to a job your being paid to do.

    Come on and ask 'I've got this job to do and this is what I'm planning' or 'I've got this homework question, this is what I've got so far', showing your calcs etc. and you're more likely to get a sensible critique and assistance.

    I know this to be true, because (feel free to correct me chaps) I've always used the later approach and the assistance and advice I've received has always been stellar. Sometimes not what I wanted to hear, but what I needed to hear.

    So my advice to you is, take the subtle (OK, maybe not so subtle in some cases) hints and work out what your plan is and then post that with your calcs and ask for some feedback on that. Posting insults will get you nowhere except maybe to the bottom of the list of people to help out.
     
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  15. Strima
    Online

    Strima Electrician's Arms

    Location:
    St Neots
    Ask a half arsed question, get a half arsed answer.

    How long is the cable run?

    How far is it run in insulation?

    What is the ambient temperature?

    What type and curve of OCPD is required?

    What are the earthing arrangements?

    Inductive or resistive load?
     
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    • Agree Agree x 1
  16. davesparks
    Online

    davesparks Trusted Advisor

    Location:
    guildford
    Is it a new cable route or is there existing containment in place with available space?

    Where possible I would usually use the same wiring methods as the existing installation when making alterations or additions
     
  17. Grant collison
    Offline

    Grant collison EF Member

    Location:
    Essex
    Business Name:
    GRL
    Thankyou it’s not me being lazy I’m
    And you are may I ask ???? You sound like the typical knob head who thinks they know everything behind a keyboard
     
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  18. westward10
    Online

    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    I have no idea what he is asking, I have been given a 27kw, TP&N supply to an isolator. So is this supply in situ and you have been asked to connect from it but you have no idea what is being connected??
     
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  19. Grant collison
    Offline

    Grant collison EF Member

    Location:
    Essex
    Business Name:
    GRL
    Seeing as your the only person to be serious mate,
    It’s a 50m run on basket
    I have on my drawing a 27kw 3-phase +N isolator
    That is all it’s max travel through celotex is 3m
    I have looked into it before I posted
    Something along the lines of this

    Amps=27kw divided (square root 3 x pf (1.0) x volts (400v) )
    I get around 89a which doesn’t sound right to me On 3 phase unless I’m missing something

    Also looked online and it’s come out on a calculator

    39a per phase so a 40/45a 3phase Mcb would be suitable

    Am I wrong here at all ?

    Thanks
     
  20. westward10
    Online

    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    You can use a rule of thumb calculation but it gives a base answer.
    (KW x 4) ÷ 3.
     
  21. davesparks
    Online

    davesparks Trusted Advisor

    Location:
    guildford
    There isn’t enough information to be able to do the calculations.
    Without knowing what the load is it is not really possible to establish whether an mcb is suitable or if fuses/mccb protection is required.
     
    • Like Like x 1
  22. westward10
    Online

    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Reported :D
     
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  23. Murdoch
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    Murdoch Electrician's Arms

    Location:
    Woking
    I think you were the knob xxxx posting such a vague question and expecting people to get their crystal balls out.
     
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  24. DPG
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    DPG Electrician's Arms

    Location:
    S Yorkshire
    I'm someone who knows what information is needed to spec a supply cable. Who were you again?

    By the way, you missed my deliberate mistake in my post :)
     
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  25. Grant collison
    Offline

    Grant collison EF Member

    Location:
    Essex
    Business Name:
    GRL
    I couldn’t actually give a **** what your on about your just a stuck up knob end that quite frankly has no impact on my life at all so crawl back under you shell as your little man syndrome is getting worse every time you talk, taddaahhh ****er
     
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  26. darkwood
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    darkwood It's all about Gmes Staff Member Electrician's Arms

    Location:
    West Yorkshire
    @Grant collison@Grant collison

    I am closing this thread, I suggest you consider your manner if you wish to continue on the forum as throwing out insults like you have been is not on, if you dont like a response then either ignore it or if it is really offensive then report it but please refrain from taking it on yourself to react in the manner you have shown.

    Ps I suggest you start a new thread and show a little more composure in your responses.
     
    • Winner Winner x 4
    • Like Like x 3
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