calculations

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  1. K

    DNO diversity calculations

    Hi, first post so please accept my apologies for going straight in with a question. Sorry if this is a bit long winded but I thought knowing the full story may help. We bought an old semi detached cottage about 7 months ago which is at the end of a 320m overhead LV supply. Initially this...
    • Kenny.s
    • Thread
    • calculations diversity dno phase supply
    • Replies: 4
    • Forum: UK Electrical Forum
  2. K

    Cable calculations help

    Hi I'm at an installation which is a servery counter. It has a 8way 3 phase distribution board protected by a 63A 30mA R.C.D the circuits are wired in 1.5mm 3core flex and are protected by 16A 60898 MCB's (all radials). They supply socket outlets which allow appliances to be plugged in. My my...
    • kirkbykarl
    • Thread
    • cable cable calculations calculations
    • Replies: 4
    • Forum: UK Electrical Forum
  3. N

    Cooker circuit and diversity.

    Evening all. Customer needs a new oven and electric hob. The current setup is 6mm T+E on 32A MCB, RCD protected, about 8M run, reference method 100. The oven they are looking at is 10.5KW. I initially thought that was too much but after adding diversity it seems ok. Are my calculations ok as I...
    • Newbyspark
    • Thread
    • cable calculations circuit connect cooker diversity method seems
    • Replies: 5
    • Forum: UK Electrical Forum
  4. C

    Cable size and load calculations

    Hi all, I need some help with working out the correct cable size for some work I'm doing at the moment. I am currently working on testing Mobile units carrying out PIR and remedial works. I have already worked out my answer which I will keep to myself as not to invite negative comments, the...
  5. M

    Voltage drop calculation

    Hello everyone just want a little help how you would calculate the volt drop if 230 single phase heater circuit line & neutral conductors combined resistance of 0.68 Temperature at 20 degrees and load current of 16A? show calculations got this in my 2395 today wanna make sure I used the...
    • Missing-spark
    • Thread
    • calculation calculations length method that's voltage voltage drop volts
    • Replies: 13
    • Forum: UK Electrical Forum
  6. M

    Wind Calculations

    Hi Had our two day MCS audit this week. Three technologies produced two non conformances . Solar PV and solar thermal ...no wind load calculations. Having read the entire section on wind calculations I am still at a loss as to how to do the calculation and what to do with the figure when...
  7. D

    cable size calculations

    Can somebody please help me, what is the formula for calculating cable size, just a query not for anything in particular thankyou.
    • davedwr1978
    • Thread
    • cable cable size calculations size
    • Replies: 7
    • Forum: DIY Electrical Advice
  8. SolarCity

    ConSole+ ballast calculations

    It's been a while since I've used ConSole units and I'm struggling to find the info which gives recommended ballast weights for system design. Can anyone help me out and point me in the right direction?+
  9. T

    Insulation Gap Calculations

    Hi - apologies if this in the wrong area, but I am new here! :sick: I'm completing a university project on terminal boards and I'm having trouble with the calculations. I need to calculate whether the air-gap I have is a sufficient arc barrier. Hopefully the picture below will help. 600V DC...
  10. B

    bit of calculations for the trainees

    Hi everyone i just been looking through my home work from last year and seen a few of my calculation homeworks and thought i would put them up for people to have a go at to try there knowlage. here is a resistance in parallel circuits homework, need to know the total resistance and total...
  11. T

    3 Phase Calculations for Star and Delta

    Hi All just a question for the more mathematical people. Have got three 15kw water heaters wired in Star . What is the current calculation for this per phase and would this change if wired in delta assuming a pf of 1 ? Regards John :6::rolleyes2:
  12. B

    voltage drop calculations

    hi was wondering what every ones opinions are regarding volt drop calculations i know there are 2 ways the ohms law way and the way where you use tables of the bs7671, the thing is i taught my self how to do volt drop calcs so i learnt the ohms law way is this a acceptable way or should i do it...
  13. S

    Calculations

    Hi there. getting all confused over calcs. Need to power two PIR sensors on poles run from TT distribution board L1 phase own little circuit for the small building the panels are kept in on small caravan site. SWA from MCb through DP switch out to 1st light then onto 2 nd light. Load current...
  14. A

    Load Calculations

    When calculating load calculation for sub-DBs and Main DBs breakers, as well as the final load at the end (let's say in Amps). how do you do it? Do you include a safety factor (to account for spikes) and a diversity factor (to account for the design factors - e.g. lights are only going to be...
  15. H

    Cable Calculations

    Hi All, I'm Wondering if anyone would take the time to explain how to calculate cables sizes & Which breakers to use? I know you have to look through Regs. But if people could explain how and which pages in the regs? I would be very Grateful! Look Forward to your responses :) Luke
  16. S

    Loading Calculations

    HI Fellas. Just a quick question for a brain box out there :)) Got a classroom that's been refurbished , that im testing. They have a Dorman Smith 3 phase 6 way Db with a 125 Amp main switch. Does anyone know the calculation to work out the total loading on each phase. There are 12 X 10.7KW...
  17. E

    Supply Calculations help?

    iv been asked to install a supply to a house and im a bit rusty. can someone please walk me through the cable calculations? supply is a protected by a 100a bs1361 fuse, cable will be swa installed direct in ground, cable length around 40 mtr. thanks
  18. S

    Power usage calculations....???

    Hi, I have been asked a question by a client at work, and im not really sure what to do, they want to know how much money they can save by turning off a lift in there building. The lift draws 8.1amps when traveling, and it draws 0.5amp when waiting on a floor. They are saying that for...
  19. C

    Motor calculations

    Hi all, I am after finding out the calculation of the running currents of single and three phase motors. If anyone could help me or point me in the right direction it would be much appreciated. Thanks in advance Craig
  20. J

    Help with calculations please

    Hi all in the forum In this forum I am an amateur, and would like some help as I am considering pv solar panels for my house, and had a cold caller yesterday and allowed him to come to the house for the first survey.I am having trouble verifying his claims and this is where I need help from...

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