calculation

  1. D

    Single Cable calculation for hot tub?

    Can anyone enlighten me on why my max Zs for this cable calc is so high? What am I missing?
    • Deleted member 4632
    • Thread
    • cable calculation hot tub single
    • Replies: 14
    • Forum: UK Electrical Forum
  2. L

    Submain/RCD Selection

    Hi there, I am new to this forum and I am finding the help very useful. Could someone please advice me on the following. So If I have a 60A Cutout fuse to the property how do you size the main switch, could a 100A be used. Also how would you size the RCD’s, why would one be 63A and another 80A...
  3. B

    Cable calculation - Derating factors

    This is my first time here so please go easy ? I am currently designing some circuits for large convenience store and I have a question about the thermal insulation derating factor. A radial circuit will feed two display fridges, total load 10A. The circuit will run from the DB through the roof...
  4. R

    Formal Calculation of RCD Size.

    I have had a good search for this information but can't find it anywhere not even in my on site guide 17th edition. So imagine you have a CU with 10 MCBs but no RCDs. You decide you want to install an RCD. You do your max load and diversity calculations for each MCB circuit and you come out...
  5. B

    Insulation Resistance Calculation

    Hi, I have an engineer who is completing his 2391-52 exam tonight and he has been told one of his mock questions was wrong, I have completed the working out myself and came up with the same answer as him, so either the paper is wrong or something has literally left my mind!! "Determine the...
  6. R

    UK Three Phase wired machine ohms law calculation

    I have a machine which is wired as 3 phase neutral and earth and is 15.1KW, there are no 415v components and all components are 230v, so effectively it is using 3 single phase circuits, however I have always carried out the circuit breaker calculation based on the 415V potential, I.E> 15120W...
  7. P

    Volt drop calculation and cable size

    Hi A good friend of mine is having a large electrical installation carried out in his garden.Hes had 3 prices from various electrical contractors regrading the install. He is having a summer house built that will house 9kw 3 phase sauna 5kw hot tub 27kw 3 phase electric boiler A 32 amp ring...
  8. B

    Cable length calculation

    Hi people, I'm carrying out an online course to gain my qld electrical licence. Been a good while since calculating cable length using equations and regs books. Can anyone guide me to the correct equations please Thanks in advance
    • Brucky
    • Thread
    • ausie elec cable calculation length
    • Replies: 1
    • Forum: Australia
  9. D

    Lost Neutral Voltage Calculation

    I understand how to calculate the current in the neutral conductor on an unbalanced three phase installation, however am struggling to grasp how to calculate the voltage movement on each of the three lines if the neutral were open circuit. I appreciate it is influenced by the current and...
  10. P

    Volt sensing relay calculation

    Hello, pls do no kill me for being this stupid (i am a videographer in nature :), and i need to make an order before my electrician returns from hospital... I want to add leisure batt to my 1987 VW t3 Caravelle along with volt sensing relay and i cant figure out how to calculate the system...
  11. PJH2903

    Stroma Certification Scheme SPD calculation / Stroma annual assessment

    I've got my annual Stroma assessment next week and the job I am taking them to is a board change. I have not fitted an SPD as by my calculations it was not a requirement (plus a tight customer would not want the extra cost) I don't think it will be a problem but am just looking for reassurance...
  12. L

    Heat pump diversity calculation question

    Hi, When calculating diversity. Does external air conditioning equipment such as heat pumps fall under heating and power in the osg such that you take 100% of the highest then 75% of the remainder? Thanks
  13. S

    Cable calculation

    Il give you the scenario, stables in a field, e-on have been out and put a supply in a hut with a meter on and a one shot, main fuse is 80amps, the customer need a fuseboard putting in the barn, 75metres away, what size cable would i be looking at, ive done a calculation, 1 x swa cable 3 core...
  14. N

    earth fault loop impedance calculation

    hello all could anyone help me i am doing my 2392 and i am a little stuck i have been asked a question which is using the following measured value of loop impedance 0.5 (40amp bs en 60898 type b mcb) ferfering to the maxium tabulated value given 1.15 show by calculation if the measured value is...
    • nathanm1982
    • Thread
    • calculation earth earth fault loop impedance fault impedance loop loop impedance
    • Replies: 3
    • Forum: UK Electrical Forum
  15. Aaronj46

    10.5KW shower 10mm stud wall query?

    So I have been working on a contract installing 10.5kw showers with B40 MCB's as specified by builders but occasionally a plot reports the shower tripping when having long showers. Hager don't do a 45A MCB but do a 45A RCBO but then its the cost....£££ The cable is ran in uninsulated studwork...
  16. telectrix

    calculation check before i rip the flat to bits.

    hi folks, got a CU change to do. flat rewired circa '70's. wylex 3036 fuses. my concern is earthing conductors. at present they are 6.0mm. TN-S. Pefc is 700A. not sure of main fuse size, so have taken worst scenario at 100A. referring to tables, @ 700A the disconnect time for a 100A BS1361 is...
  17. C

    GN8 9.3.1 Calculation of csa – armoured cable 118

    Ordered GN8 not arrived yet anyone got section 9.3.1 Calculation of csa – armoured cable 118 to hand
  18. Cornish1984

    Five core 32A 400v sea cable calculation help

  19. Cornish1984

    Help cable calculation please newbe

    I have a design unit and 14 circuits to do. Can some one please help as I have completed 1 of my knowledge and before I crack on any help on this would be great. It's a rough copy so excuse the mess. Thanks. It's question 4. Thanks
  20. M

    Calculation software

    Hi All I’m looking for cable calculating software that would be suitable for commercial/industrial installs, can anyone recommend any please? Also any software/templates for estimating costs if possible please? Or is this something most people would put together themselves on an excel...
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