calculation

  1. andysparkfree

    95mm 4core SWA, just trying to go definitive on the steel to copper calculation

    good afternoon guys I have a 95mm 4 core swa to this new office build , thats fed via a new exterior mains panel located next to a new sub station. now all feed cables on this project have been designed by an independent company, and i currently have flagged up that i believe that using just...
  2. T

    Calculation of capacitor value for conversion from star to delta

    Hi does anyone have a notion of how to calculate the capacitance value for the above?
    • The Ghost
    • Thread
    • calculation capacitor conversion delta value
    • Replies: 30
    • Forum: UK Electrical Forum
  3. L

    Short circuit calculation

    Anyone able to help on the following... Short circuit calculation & current carrying capacity of: 50x10mm2 copper busbar & 80x6mm2 copper busbar One for the brain boxes..
  4. H

    3-phase cable calculation

    Hi, A while ago I posted about my neighbours 3-phase generator etc.... So he's being running through diesel like there's no tomorrow and been talking to a local barn who have said he can take the power from his property to supply their kiln. He's been measuring the his average usage over the...
  5. 85mick85

    Lighting Calculation Help

    Looking some help with a question in an assignment I'm doing: A workshop with 175 watt low pressure sodium vapour lamp at 3 meters above the floor. The Sodium vapour lamp efficacy is 142.8 lumens per watt Calculate illuminance and 4 m to side of lamp Thanks in advance ;)
  6. D

    Cable Calculation for 2x25mm XLPE SWA

    Good evening all. Just wanted some advice on a cable calculation, How do you calculate the carry capcaity of a circuit when there are two cables suppling a DB, we have 2x25mm XLPE SWA cable suppling a DB, just wanted to know how you would calculate the carrying capacity of these two cables...
  7. L

    Three Phase calculation

    Hi, need to ask a question about a 3 phase air condition. On it's data tag it is rated at 20Amps. When it rated like this are the 20amps on each phase? Thanks in advance.
  8. L

    Cable Calculation Question

    Hi there, Just after some advice for a submain/DB I’m quoting. A client has asked for a 12way TP board to be installed in a warehouse and the length of run is 150 meters. Section panel I’m coming from has a ZE of 0.05. MCCB will be a Square D CDAE 63A so max zs 0.68 at 5 second. Here’s my...
  9. J

    Cable size and protection - calculation

    If possible could anyone have a quick look over these steps I've made myself for cable sizing and the protection needed. Please let me know if I've missed out anything. I also couldn't find a definitive answer for maximum permitted voltage drop percentage for 3 phase. I think it was 5% and 8%...
  10. MODECSOFT

    Video - Cable size calculation example

    In this video tutorial we demonstrate the steps needed to complete a comprehensive and accurate single cable size calculation using ElectricalOM Software in accordance with BS7671 IET wiring regulations.
    • MODECSOFT
    • Thread
    • cable cable size cable sizing calculation electrical videos electricalom example size software video
    • Replies: 2
    • Forum: UK Electrical Forum
  11. A

    Diversity Calculation In Offices And Workshop

    Hi i'm currently doing some course work and have no access to the On site guide. Does anyone happen to know the diversity for, lighting, ring mains, Welding equipment, TP-N equipment and a car ramps. The building is an Office building and a workshop, Thanks.
  12. N

    Completing Zs box on schedule of test results

    When unable to carry out a Zs test on a lighting circuit (large/heavy chandelier type lighting), then the R1+R2 + Ze measurements are instead used and this is noted, but is it the norm to still write this value in the Zs box on the schedule of test results or just in the notes. I ask because...
    • Nicebloke
    • Thread
    • box calculation chandelier lighting results schedule still test
    • Replies: 23
    • Forum: UK Electrical Forum
  13. J

    Cooker diversity with SEPARATE oven/hob

    Hi all, Looking at replacing kitchen. Current setup is 2.2kw oven, 5.6kw hob.. total = 7.8kw on 6mm cable, back to a 40a breaker. The current cable run is short.. 2m from CU, in breezeblock/plaster.. 2m clipped direct, to a 45a switch (for oven in tower).. 3m spurred from that, on...
    • Justme761
    • Thread
    • breaker cable calculation cooker diversity makes separate total
    • Replies: 8
    • Forum: UK Electrical Forum
  14. Dave301

    Testing an off-peak board

    How would I be best to go about putting a temporary supply to an off peak board for testing for accurate Zs readings? There is a board adjacent with a permanent supply.
  15. gazdkw82

    Parallel resistors

    I'm getting conflicting information regarding parallel resistors. I originally thought the below was how to calculate total parallel resistance 1. Rt= 1/R1+1/R2+1/R3 2. 1/Rt However in my pre exam workbook it says to 1. Calculate Rt as 1. above 2. Find the lowest common denominator 3...
  16. B

    Calculation of KW use of 3 phase heater on single phase

    Hello I have been asked to install a sauna heater. It seems that all sauna heaters are 3 phase but the phases can be bridged to run on single phase. However, I seem to remember there is a calculation for figuring out the difference in power when running a 3 phase appliance on single phase. I...
    • BigMatt
    • Thread
    • 3 phase calculation heater phase power single single phase three
    • Replies: 9
    • Forum: UK Electrical Forum
  17. 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
  18. 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...
  19. 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...
  20. 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...
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