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calculating

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  1. M

    Designing and calculating

    Hi guys I asked my work to help me wrap my head around calculating and designing for cable sizes. I watched chris kitcher on poo tube to get a better grip. My manager posed a scenario and ive tried calculating it but it doesnt seem right. This is the set up. There is an outbuilding 45m away...
  2. C

    Calculating the correct cpc size

    Good evening all, Some help with following would be much appreciated. A 20 Amp rcbo in a CU supplies an adaptable box on the outside wall of a house via 2.5mm2 T & E. From the adapatable box a short lenght of SWA supplies a couple of sockets and light in a shed. My question is does the 1.5mm2...
  3. N

    calculating the de-rating of a cable near a heat source

    Im Working on a new build site at the moment, and the kitchen layout has changed to include an island with a hob on it. Meaning im goin to have to get power to it. The underfloor heating pipes have been run in already and the floor has been screeded. Theres about 50mm before you get to the...
  4. A

    Calculating Cable Size for Ring Circuit

    Hi All, I'm needing to calculate the cable size for a long ring main. Cable type will be SWA/LSF. The ring is feeding 5no Twin Sockets, on a 32A Type B RCBO, kicker is the length out and back is 300m. Using cable calculation tools can i half the length, 150m, half the current, 16A and allow 20%...
  5. Marcus Vaughan

    Calculating Voltage Drop On Lighting Circuits

    Hello All, I should know this and have been avoiding asking but just want to be sure. So I am designing a downstairs lighting circuit for a domestic refurb/rewire. I reckon max demand will never hit 3 amps. So using the basic formula for voltage drop - (tabulated value x design current x...
  6. T

    Cable Calculating Software

    Hi Guys I would like some advice and recommendations for an affordable cable calculating software package for some projects i will be taking on myself. At work we use Amtech Prodesign which is very good but expensive. I am currently having a play around with the trial version Modecsoft...
  7. T

    DCP 161 implementation April 1st and calculating KVA, maximum demand

    I have alluded to this in previous threads. The commercial site I work on has asked me what I think the total KVA for the site is. Having looked at various ways of viewing this I am getting lost with it. So if I just say kVA = ( V*A*1.73)/1000 and assume supply is 400V and take the main incomer...
  8. C

    Calculating three phase power usage.

    I’ve been asked to calculate power usage of a machine to works out how much it costs to run. Current draw is: L1: 9.71 L2: 9.61 L3: 11.14 N: 7.78 Obviously when designing a circuit you would base it in the highest phase ampage. But is power usage worked out the same way? Or are three...
  9. B

    Calculating main switch size

    My friend, a plumber is at a job with a 63A 3 phase main switch, and the board has a few 20a circuits, a few 10a, and a few 32a. Hes replacing the 20a double pole breaker from the old water heater to a 3 phase 40a breaker, to suit the new heater. What is the formula/calculation to determine the...
  10. Jamie'

    Calculating volt drop finding ib

    I'm an apprentice and I was going through my college work to do with volt drop and everything I needed to know about the design current was in the question. What I'm confused about is in the real world how you would know this? Am I right in thinking for arguments sake if I'm supplying an out...
  11. P

    Calculating current supplied to led drivers

    Hi folks. On the site I'm working, another company is fitting out a little gym with ---- loads of led's in the ceiling. The strips are 100 mm apart and cover the area of roughly 8 metres by 8 metres. They are divided into 3 rectangular grid like formation. So here is where the numbers come...
  12. J

    Calculating cable size - start to finish

    Hello everyone, I would like it if anyone would be able to help me in listing the steps For choosing cable size. Starting from protective device from a boards 'Zs' value, all the way to the cable size. Thanks in advance
  13. Loki

    Understanding manually calculating Zs

    Hi, I know that Zs = Ze +(R1+R2) & that you can look in the OSG page 125 to get maximum Zs figures (with the applied 0.8) but I wanted to check if my understanding to calculate it manually is correct? Example: 16Amp MCB type B 230v 16Amps x 5 (cos of type B) = 80Amps Ohms law formula...
  14. Jake Wesley

    Calculating power dissipated in a circuit HELP!!

    Hi guys. I have been looking on the website 'swindon massive' (very useful for anyone studying at college) and one of the questions in the mock exam for principles is; "An inductive load with 10 ohms inductive reactance is connected to a 100v 50 Hz AC supply. Calculate the power dissipated in...
  15. M

    Calculating r1 from R1 + R2

    Confused my self calculating r1 or 21 from R1+R2 on a ring circuit did this a while back and compared calculations with measurements to see the differences. but tried the other day think i have muddled the equation! or maybe because its monday haha can someone show me an example
  16. H

    RLC in Parallel - Calculating instead of Drawing

    Morning all, Last night at college we moved on to RLC circuits in parallel, the type you'd typically find in a fluorescent light to correct power factor. We drew out some parallelograms to work out the true current usage and power factor after adding a capacitor. The lecturer said that's all...
  17. P

    Calculating Power Requirements For A New House After Diversity

    Hi all, I am not an electrician by trade but need a answer, if possible, as to how best calculate the power requirements for a new house that I am building, my electrical network supplier has asked me if I can tell them what the house will require after diversity, as I do not have an electrician...
  18. J

    calculating total consumption for each of the circuits and final maximum demand curre

    I have to calculate the total consumption for each of the circuits and state the final maximum demand current. downstairs :2 fittings with 5x 12w lamps,1 fitting with 5 x 12w 1 fitting with 10 x 12w,1 fitting with 1 x 60w,1 fitting with 7 x 20w 2 fitting with 3 x 20w,1 fitting with 4 x 30w and...
  19. F

    Calculating minimun sized CPC

    Hi all, just working through an assignment at the moment, got everything done other than two questions worded "select an appropriate minimum sized CPC and confirm your selection by calculation". I've already calculated my tabulated current, volt drop and live conductor size for each question...
  20. T

    Calculating electric motor cable size

    How do I calculate cable size for 2x 22kw motors, power factor 0.86. One will be running whist the other one is for standby, but in case of high load both motors can run together, but it's very rare to have high loads.

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