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calculations

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  1. A

    Question regarding Voltage Drop Calculations

    When one is calculating the voltage drop of a circuit, one must determine the length of said circuit. However, I am not sure whether the length of the circuit includes the length of both the Live conductor running out from the consumer unit to the furthest circuit AND the Neutral conductor...
  2. E

    Cable Calculations?!

    Looking at putting a lathe into a workshop.. 16A, 3 phase, a run of 19metres at approx 35 degrees. Also, a 3 phase, arc welder which I was going to put into a 32A socket outlet. 7 metre run, again at 35 degrees. Can someone help with how I would complete a cable calculation for either...
  3. jaydub

    True Power Calculations

    Hi guys, hopefully, maybe, someone will be able to help me with this one. Trying to get my head around true power calculations and am really struggling to understand it. So the scenario goes; Three coils of resistance 40 Ω and inductive reactance 30 Ω are connected in delta to a 400 V...
  4. GBDamo

    Voltage Drop Calculations, Potentially Stoopid Question?

    With reference to Voltage Drop calculations and Table F4(ii) OSG page 151. When designing an installation the cable is selected, among other factors, so that the maximum operating temperature is not exceeded, in this case 6242Y T&E = 70C. The table, titled "Voltage Drop (per ampere per meter)...
  5. G

    Help with CPC size

    Hi I am training to become an electrician. I have a problem to solve to work out the size of the CPC. My calculations say I would use 6mm and 1mm CPC. This can't be right, can it? Please refer to attached document for details.
  6. P

    Cooker diversity calculations

    Could someone please just giving me the nod that I'm not nuts! Simple cooker swap big range induction beast with max draw of 16.2Kw With a socket I make it 33Amp. Imagine my confusion when customers shows me all the materials he has for the job which a spark has charged £500 for but no longer...
  7. B

    Cable calculations

    Can anyone help me out how to find minimum kva? The question is, determine the minimum KVA, you have 0.5kw, 12v motor and a power factor of 0.8 cheers
  8. MODECSOFT

    ElectricalOM - Electrical Design and Calculations Software

    Hi! We are happy to be sponsors in the electricians forums! We are a software development company dedicated to provide specialized software solutions for Electrical Design and Calculations in accordance with BS7671. You can check our new software ElectricalOM here: https://electricalom.com...
  9. 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...
  10. Gazthesparky

    Will you check over my calculations

    Hi Guys I would appreciate someone just casting their eyes over my calculations. I carnt decided what to do I'm doing a kitchen renovation and existing 6mm 32a supply but I don't know whether to upgrade to 10mm and 40a breaker as the volex unit doesn't do a 45a Diversity comes out at 22amps...
  11. A

    cable calculations

    Hey guys just practising my cable calculations, could you tell me if this is right I am doing it according the onsite guide as instructed in college... this is the example 11kw oven (i know its unrealistic just making things up) 16 metres from CU using MCB single phase 230V cable will be in...
  12. S

    Cost Calculations

    Morning to all. I have been offered by a very good client of mine the chance to price for a big job.Now the work i have to say which is the refurbishment of two sets of luxury wcs/showers etc and the adjoining corridoors. 220 metres in lenght. Needs new tray , landlords lighting . Tray...
  13. E

    Three Phase Load Calculations

    Evening Chaps, I need some assistance with regard to a three phase load calculation. Back story here is im fitting a new supply cable for an industrial three phase oven and need to know what the max load will be per phase to ensure adequatley sized cable is is fitted. The cable run will be 80...
  14. J

    Ze for design calculations

    I have a question for the designers out there. when carrying out design calculations prior to a new supply being installed what value of Ze do you use? ON the limited number of occasions I have done this myself I have always used the highest allowable (eg 0.35 for TNCS or 0.8 for TNS) when...
  15. rustynails

    94/5 questions. calculations and clarification welcome.

    1) A length of conductor has a resistance of 0.6 ohm. State the expected value of resistance of a similar conductor of - The same length and twice the csa - The same csa and half the length - Twice the length and half the csa 2) State, apart from loose...
  16. M

    30kw boiler cable calculations

    Hi guys just a quick check in my calculations for a quote I'm doing 15meters clipped direct 30,000w divided by 400v = 75a per phase im using sy cable and think 16mm 5 core is best What you guys think
  17. D

    Diversity calculations, a little challenge for you.

    Here's a littlediversity calculation challenge for anyone who wants to have a go atit, Below is a list of allof the connected loads I had on a music festival over the last weekend,this represents the total connected load across the whole site, thechallenge is to calculate what the actual load is...
  18. M

    Cable calculations ?

    Just seeing if im doing this correctly so im using a post from the main forum that someone has asked for help with. cable calc for 9kw electric boiler. This is my first post and not sure if in right place! My company have asked me to quote for a supply to be run for a 9kw electric boiler, the...
  19. 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...
  20. 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...

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