calculation

  1. 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
    • stv292
    • Thread
    • aus calculation question
    • Replies: 18
    • Forum: Australia
  2. 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...
    • wade88
    • Thread
    • aus calculation help help please kva please
    • Replies: 26
    • Forum: Australia
  3. 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...
    • magpiemorgans
    • Thread
    • aus cable calculation help
    • Replies: 3
    • Forum: Australia
  4. 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
    • Monkey
    • Thread
    • aus calculation
    • Replies: 5
    • Forum: Australia
  5. 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...
  6. D

    roof calculation for solar panels

    is it a requirment for roof calcs for mcs inspection does anyone know them
  7. 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...
    • Penance
    • Thread
    • aus calculation check please
    • Replies: 12
    • Forum: Australia
  8. 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 =...
    • ta-electrical
    • Thread
    • aus breaker calculation circuit circuit breaker help size
    • Replies: 40
    • Forum: Australia
  9. 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
  10. 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...
    • ta-electrical
    • Thread
    • amp aus breaker calculation correct help phase require
    • Replies: 1
    • Forum: Australia
  11. 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...
  12. 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.
  13. 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...
  14. 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...
    • bathcity
    • Thread
    • already calculation circuit help lighting lighting circuit outlets
    • Replies: 2
    • Forum: Talk Electrician Forum
  15. K

    cable calculation

    Hi please can someone assist me in confirming the correct size for sub board. ( ie ) i have 4 motors rated at 18.5kw feeding each motor individual 16mm swa distance 50mtrs . From supply to d/b 50mm swa 100mtrs protected by 200a if full load was to be used. any thoughts appreciated
  16. E

    SAP Calculation

    Hi, in the SAP calculation 0.8*kWp*s*ZPV is the kWp the peak output of the pv array or the output from the inverter? Thanks.
  17. M

    Distance Calculation to find fault

    Does anyone know or where to find the calculation you do to find a fault/break in a circuit that can't be physically traced.I'm sure i've seen it somewhere in one of my books but can't remember. Cheers
  18. SolarCity

    SAP calculation figures vs. PV SOL figures

    I am becoming increasingly frustrated at the survey handcuffs we all have to wear regarding performance figures. While I can see the benefit of maintaining an industry standard for evaluating system performance, I find it a little baffling that we use such a vague and general standard such as...
  19. G

    Pv array test calculation excel sheet

    Guys This might help you!!!! if the file attaches with the formulas!!!! Just enter the Isc and Voc and it will calculate the final Isc at the correct radiance. Let me know if it works. The file won't attach for some reason ( bl---dy computers. I will send it via your email If you PM me with...
  20. S

    Calculation need helps

    1. A 630 kVA transformer feeds a 3phase 400 V 50 Hz main switchboard located at distance of 100m and is connected using 2 parallel runs of 240 sq.mm 4 core copper cable buried underground. An arc fault takes place on the bus terminals while an operator is trying to do live work in a panel (with...
Best EV Chargers 2025
Best EV Chargers by Electrical2Go! The official electric vehicle charger supplier.

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

YOUR Unread Posts

Daily, weekly or monthly email

Receive a daily, weekly, or monthly email containing a digest of new and recently updated threads.
UK Tiling Forum | Tilers Forums
UK Tiling Forum by Tilers Forums UK
Plumbers Forums | Plumbing Advice | Gas Forum
Electrician Tips from Professional Electricians
JBOD Forums: a forum for JBOD storage server advice
JBOD Suppliers: JBOD Storage Server Supplies
Back
Top