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calculation

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  1. R

    KWh Calculation

    hello, I am using single phase direct driven motor with three speed for Fan Coil Unit. The unit specification shows 350W I was try to calculate the Power using the equation VI, current reading will get from using the CT meter in particular wire connected to the motor. Current reading is 0.44A...
  2. sythai

    Storage heating calculation....

    Good afternoon chaps.... Just been trying to find a calculator on line, but no joy - Dimplex has one, but not very user friendly! Have a couple of rooms requiring night stores, so need to calculate the sizes required. Could anyone please point me in the direction of where I may find a...
  3. D

    by calculation

    by calclation does ze +zs equal r2???
  4. C

    Help with load design calculation

    Hi All, I have a site that I believe will be overloading the curent supply and board main switch and would like some input to check my figures. The client runs a software design company and useage of PC's, monitors & servers is very high. The main intake is rated at 100A BS88 fuse and the supply...
  5. S

    calculation question

    hi the osg say's i can use 56m of cable of 1.0/1.0 installation method 103,101 e.tc. for lighting, on a radial at 6A. the mV/A/m is 44. so 44x6x56/1000=14.7v that is 6% of lighting not 3%. what am i missing
  6. W

    KVA to KW Calculation - help please

    Morning fellas, Been getting some rather high meter readings lately so trying to compile a machinery list so i have a good idea of what is consuming what and where, and how much our bills should really be looking like each month etc. Pretty standard maintenance stuff. However im having...
  7. M

    help with cable calculation

    Hi guys , I need a little help to do a cable calculation . I have got to install a swa cable to a new merlin gerin 8 way 3-phase d/b via a new 520/415V transformer about 70KVA with a secondary output of around 80A The cable will be a 4 core (3 phase+earth ) The length of cable is 80 metres , 20...
  8. M

    Calculation

    call me stupid, but can some tell me I have 15 roof top fans running 24 seven each fan is 45 watts I want stop them over night for six hours and restart every morning how much electricity would be saved and could a cost be put to it in pence per unit regards M
  9. K

    General kitchen applicance power consumption calculation KWh, KW etc

    I'm playing around with max demand and diversity figures and thought I'd try and get better/more factual figures. Most appliance manufacturers tend to quote in KWh which doesn't make much sense for instantaneous power calcs and for A rated appliances the actual power seems to be very low with my...
  10. D

    roof calculation for solar panels

    is it a requirment for roof calcs for mcs inspection does anyone know them
  11. P

    calculation sanity check please

    Hi All, Been away for a few weeks but now starting planning on a job. I will be installing a sub main for a single room office area in a house extension. The sub main will be run in SWA protected by a 63a MCB. The run is 7 meters to a CU that will have 3 circuits on RCBO's Circuits are 1x 32a...
  12. T

    Three-phase circuit breaker size calculation help

    Hi, i'm a little confused about the way to calculate the amp of the circuit breaker for a three-phase system. If i have a power of 11.5 kW and voltage of 400V, what size circuit breaker is needed for three-phase system. My calculation was 11500/(1.732x400) = 16.6 Amps per phase ... 16.6 x 3 =...
  13. the pict

    pfc/psc manual calc

    When calculation Zs how do I arrive at the PFC for that circuit, I know the tester works it out but whats the calculation formulae Pict
  14. T

    Help with breaker amp calculation

    Hi, i need to know whether my calculation is correct. I have 4 x 2.2kW Motors (3-phase) , i have a miniture 32 Amp breaker (Type D) but according to my calculation i require a 40 Amp breaker. This is how i calculated it: 8800/(400x1.732) = 12.7 Amps per phase ---> 12.7x3 = 38 Amps Was my...
  15. T

    primary current calculation

    First question from the 2391-20 this week 18 x 24 volt soldering irons to be supplied by a transformer via elv sockets, what is the design current of the primary circuit i said the secondary load was 360va so choose a 400va transformer the primary would be 400/230 = 1.73A, am I wrong or...
  16. S

    Volt drop three phase

    When calculating volt drop on three phase, I can't remember if I my calculation is using the total current on all three phases or just each individual one. So each phase at 400v is 3.8A. My calculation was 2.5mm minimum. A three phase motor run in SWA. The run is 200M underground.
  17. S

    350 KVA HV Transformer? 3 phase calculation confusion

    I need to buy a 3 phase HV transformer for an apartment block 1382 Amps is the total predicted single phase load after diversity. 1 Phase KW 1382 Amps 230 Volts ( I/V) 317.86 KW KW 1 Phase KW to KVA 317.86 KW 0.9 Power factor ( KW x P.F. = KVA) 353 KVA KVA Single Phase to 3...
  18. V

    SAP Calculation Spreadsheet

    Hi Guys, I have spent a little time using the tables in SAP 2009 to set up a simple excel spreadsheet to calculate expected returns for and Pv system. Could i email a couple of you guys the spreadsheet to see if its correct and what you think could be improved, i will soon be adding more...
  19. B

    Lighting circuit calculation help

    Hi everybody, I've been asked at college- when installing additional lights to a house, whether it is necessary to install a seperate circuit when the existing lighting circuit already contains 10 lighting outlets. I know as a rule of thumb it's 10 lighting outlets per circuit, but what...
  20. L

    Free short-circuit calculation software

    Hi everybody I have developed a software to calculate short-circuit currents and voltage drops in low-voltage systems. I'v been using it for a years now and developing it continually. It's a fast, comfortable and very easy to use, menu based software and I thought to ask is there any interest...

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