calculation

  1. Z

    The problem with learning by wrote and working without calculation

    Firstly I just want to say that working from tables and on site guides can be great for convenience, and this is good. But so often the very presence of these easy and convenient rules of thumb to comply with regulation may prevent a person from developing a deep technical understanding of why...
    • ZEDEZ
    • Thread
    • calculation doing electrical work learning often problem that's understand without working
    • Replies: 11
    • Forum: UK Electrical Forum
  2. P

    Help needed with max demand calculation

    Hello all, i posted this in the electrical theory section but with no responses I thought I would post here as well - since originally posting I have spoken to ELECSA and they have basically said I can use any basis I want to calculate diversity so long as I document what I used and why which...
  3. soms

    Volt drop calculations - a couple of questions

    Hi, I currently am working on some cable sizing calculations for an exercise in which we apply our knowledge and use of the OSG. We have a ficticious single-phase, light commercial installation for which we have designed the circuits to supply a range of requirements and loads. We have selected...
  4. rolyberkin

    Oven Circuit Question?

    So luckily I am now onto the design module and by chance a friend asks if it is possible to change her LPG gas hob for an electric one, existing oven circuit is fed by 32amp MCB, 6mm T&E normally clipped with no insulation, 15m run. Existing double oven is 5.5kw full load and the proposed hob...
  5. B

    Maximum zs calculation

    Hi All, Wondering if any of you could help... I am currently pricing up a Nursing home extension and the easiest method to get a supply including the cheapest is for me to run a 16mm 3 core SWA from the existing care home to the extension which is approx 85 metres. The supply will be fed from...
  6. R

    CPC Calculation

    Hey all, To calculate the resistance of the CPC you end up with an equation with (R2 + RN) / 4 = R1 where R1 is the line conductors resistance, R2 is the CPC resistance and RN is the resistance of the neutral wire. My question, Is this method below also an acceptable way of doing it (if the...
  7. C

    PV Output Calculation Steps

    Hi guys, For my current dissertation project at The University of Strathclyde, I am attempting to build an Excel model which calculates PV output for given direct and diffuse solar radiation levels. I have attached below the calculation steps (within figure and as attachment) that I was taught...
  8. B

    Cable calculation challenge.

    Trainees, I realise this will probably be a little over what you will have covered (or in fact will cover) in college. I'm hoping that it may open up a new route of thinking how to plan bigger installs. Mentors feel free to have a bash. :) Here's the scenario. (It's from a real job I...
  9. M

    Three phase calculation

    Hello everyone please can someone calculate the current for a three phase machine at 28kw unity pf I already I have seemed to forgot how to use the calculator cheers in advance 27kw three phase
    • m4fiaafg
    • Thread
    • calculation phase three three phase
    • Replies: 45
    • Forum: UK Electrical Forum
  10. E

    Lighting calculation UF

    Hi all, Does anyone know where I can find utilisation factors (UF) to use in lighting calculations. The room in question is under a mezz floor in a church hall. Regards Dave
  11. J

    Cable calculation software

    Hi Guys, Does anyone know of a half decent cable calc programme? I don't mind paying for one that's good and easy to use but some of the ones ive googled seem very expensive to me.
  12. P

    Full Calculation of Perspective Fault Current - PFC

    I seem not to have access to the professional forums so I post this here: I understand ohm's law and to get a current you use Volts/Resistance (V/R); so if it's Perspective Fault Current (PFC), it's V/R or Volts/Ze; and we divided by 1000 to convert to kA. Yes? Is there a difference when...
    • puffy
    • Thread
    • calculation current difference fault fault current higher pfc volts
    • Replies: 2
    • Forum: UK Electrical Forum
  13. M

    Where to start with calculation?

    i dont know where to start, i am guessing that i need to find the transformer size from there i can find the primary/secondary feeders and size of mcb
    • mep electrical
    • Thread
    • calculation start where
    • Replies: 1
    • Forum: UK Electrical Forum
  14. C

    SWA Cable Calculation Help

    Dear Forum Members, I am hoping you maybe able to provide some cable sizing help. We have a 450KVa generator which has a 400amp Main Switch going to a Dorman Switchgear. Only around 50% of the generator power is currently being used. We had a second generator (170Kva) generator which has...
  15. R

    Calculation and design a solar grid tie system

    Hello, I would like to know the approach and calculation how if I are to design 10MW of solar grid tie solar pv system. Lets say that each panel have the specification as follows.. Power 250W V- 40v I- 10A Inverter efficiency 90% Grid power output req. 10MW. Therefore panel output req...
  16. R

    Cable Calculation

    Trying to do a cable calculation to determine the most suitable cable to be used. But l am unsure what to do with the figures in the 17th edition because after 16mm cable onwards there are 3 columns under volt dropr, x, and z. Can anybody show me the calculation which l need to do to determine...
  17. G

    electrical calculation question

    hi all, dont know if in correct section ofn forum but here we goes calculate the diameter of an aluminium busbar which is 24m long and whose resistance is 0.00139 formula a= pl/r and then convert the csa area into a diameter which i dont know how to do. a = 2.84*10-8*24/0.00139 =4.9 I f im...
    • gymboy34
    • Thread
    • calculation electric electrical question
    • Replies: 17
    • Forum: UK Electrical Forum
  18. E

    voltdrop calculation

    been to look at a job with a long main supply approx 60m long underground 25mm 3core SWA running off a 100amp fused isolator. meter position is at drive entrance and house is approx 60meters away. not done a voltdrop calc for ages so can someone correct me if i,m wrong. this is a new build...
  19. cprfenom

    Adiabatic Calculation

    When doing the adiabatic calculation for cpc on a circuit greater than 32 amps, do you specify 0.4 or 5 seconds on the trip time? So my situation would be 40A MCB no RCD 230V and Zs of 0.33 ohms Kind regards, Chris
  20. Y

    Maximum demand calculation

    Hi. Question regarding maximum demand calculation. I have a customer which wants to have a second kitchen fitted in the house. Is this at all possible? There are two consumer units in the house. One which has following circuits: oven 40A hob 32A ring basement 32A ring gtound floor 32A ring 1st...

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