factor | Page 5

factor

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  1. K

    powre factor correction

    hi..... power factor correction is applied to circuit having lagging power factors in order to reduce circuit ....... what ????? please help
  2. P

    Fancy a bet on wagner to win the x factor

    Vote Wagner - Vote Wagner X Factor - Vote Wagner To Win - the wife watches it so that means i do as well:o watched it tonight and i can honestly say i thought they were all rubbish. It would be a laugh if he won :D
  3. K

    Motor power factor correction

    Motor power factor correction I’ve been playing around in Excel again. If any one wants a copy of this sheet send me a PM. I’ll also send the updated FLC sheet as well. A quick note about the PF sheet, for multiple motors you’ll have to decide when during the start up of a group of drives the...
  4. D

    Power factor question

    revising for my 301 on Thursday and Ive come stuck on a question, any ideas? A 30KW 3 phase delta connected motor has a power factor of 0.86 lagging. Calculate the line current. answer is 50.35a but i dont know how to get there thanks in advance :)
  5. B

    grouping factor

    hi all does any one know if there is a min length of cable which must be calculated for grouping Ie a drop of 500mm to a fuse board a drop of 1000mm ect and i read some were that these are for cables loaded 100% of the time so would these need calculating on a light bed room ring of...
  6. R

    Velocity Factor

    Hello I'm having a play with a TDR to find a fault on an underground cable. The piece of kit I'm using is the Megger TDR 2000/2. I need to put in the Velocity Factor of the cable to be tested which is a 240mm 4 Core Aluminum SWA, the length of run is about 120M. Anyone have any ideas where I...
  7. B

    Krypton Factor Time!

    Ok, I have three accessories consisting of a lighting circuit, a ELV lighting circuit and a decorative garden water feature and a block of three switches, one for each item, but.. I have only two wires 'T & E' running down to the switches from the JB's linking the main circuit and accessories to...
  8. C

    Circuits on phases

    Hi I was wondering if anyone could explain about circuits on phases, on sites that I work on we r given drawings with lighting circuits and power circuits and I get told we need to keep certain circuits on certain phases but dnt knw why, obv you have exp L1 L2 and L3
  9. B

    Mains incomer grouping factor!

    Hi guys, I am designng at route for 5 flats & Landlords mains power supply! The property is 3 storys heigh and two incomers go off on each floor. Just wondered the distances I need to keep the cables apart going up the building. I have found in some literature from our mains power distributor...
  10. B

    cable temp factor for 70/90 degrees cable

    Hi, I'm in the process of trying to do a "monkey sheet" to enable my apprentices's to make correct cable size calculations. I'm happy about the use of the 1.2 factor used for 70 degree rated cable but I havent come across the 1.28 factor for 90 degree cable before. I would be most grateful if...
  11. M

    Difference between power factor correction and voltage regulation

    hi all, i'm actually confuse of the working principals of a STATCOM between power factor correction and voltage regulation.For PF correction,STATCOM supplies reactive power to minimize current drawn from the generator from an inductive load. In a DSTATCOM, reactive power is also injected to...
  12. E

    Volt Drop Calculation

    Appendix 4 in the regs has tables for Current-Carrying Capacity and Voltage drop. I've used these many times with no problems, but i've never had to calculate a cable higher than 25mm. when you look at cables 25mm and higher you see three values for mV/A/m (r, x, & z). Using the calulation...
  13. F

    Low power factor

    hi i'm fabio from italy. i'm searching the costs (penalties) of reactive power request in europe. someone can indicate me some link about reactive power english methodology? thanks
  14. W

    Power factor capacitors

    Hi guys. Anyone know of a good web site or formula to work out what Kvar value is required for a 3 phase 4pole inductive motors? Thanks :)
  15. B

    shower cable

    9kw shower to run on a 6.0 swa clipped direct for 30m but for 2 metres it goes through a boiler rm so what is the min amount you guys whould take including a temparature factor in calculation although these results are addiquite i will be running 10.0mm but am i being over the top any thoughts
  16. S

    grouping factors in metal trunking

    hi everyone got a querry regarding above. through approx 1.5m om the installation all the main cables run through a 4" x 4" metal trunkning, was wondering if anynone is knowledgable at working the grouping factors out?? got a lot of pvc/pvc running though cheeers

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