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factor

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  1. A

    Help With Circuit Design

    Guys, I have an assignment which I am struggling with but which should be easy and have read loads of books I keep going around in circles. Can you please put me back on the tracks. The task is for the design of a RFC in a garage with the routing clipped a few centimetres below the ceiling and...
  2. S

    Poof power factor or what!

    I have a small 3 phase motor and decided to do a little power factor calculation. The motor is rated as follows: 0.18KW, delta amps=1.01A, Star amps=0.58A, full load power factor=0.76 and full load efficiency=58%. Now power factor can be calculated as follows: Power (watts) / root3 x volts x...
  3. N

    LED vs Fluorescent

    Hi all, I have been asked by a local community centre for some advice changing some faulty 6ft strip lights to LED. As far as I can see 6ft LED tubes are Twice as expensive as replacing a ballast and tube but half the wattage (i.e. half the running costs). does anyone have any experience with...
  4. D

    space factor

    I want to spur one double socket off of an existing socket using 2.5 t&e run in pvc mini truncking,what size truncking should I use?
  5. K

    Earth Fault Loop Impedence question

    hello, i got this qustion and would like someone to show me the working out of it please. the measured value of loop impedance for a circuit is 0.83 ohms. if the temperature at the time of the test was 20c and the cable is 70c (factor1.2), what is the correct value. ze = 0.4 ohms
  6. S

    power factor correction, help?

    I am after a little help if anyone can, on a problem i've been given at the factory i work in... We have a limit on our supply capacity we are allowed to use (950kVA) before we get hit with extra charges. Using our own energy monitors, our usage (max) is approximately 880kVA over the last...
  7. jason121

    ASHP Seasonal performance factor

    Any comments about this statement, does this mean all the high temperature heat pumps or heat pumps running on existing radiators wont be getting the RHI payments. In addition, the Renewable Energy Directive sets out a minimum efficiency that heat pumps are required to meet in order to be...
  8. N

    Dialux Maintenance factor

    Hey just a quickie, iv calculated my maintenance factor on a lighting design as 0.62. When i used DIALux to calculate it, it came out as 0.80. Any ideas as to why theres such a difference?
  9. C

    grouping of cables factor

    hi all, the job i am doing for my first assesment is garage supply in conduit(i have previoulsy posted about that) and replacing the c/u, on assessing the job today for the c/u all of the cables come down from the ceiling in a wooden box covered with a wooden front, i removed the front cover off...
  10. R

    power factor correction units

    hi guys i need advice my friend passed on some remedials for a factory i mainly do domestic work however given the climate i fancy taking it on but part of the job is installing a new pfc unit which ive never done how hard are they to do should i leave that part to a more suitable spark thanks...
  11. T

    grouping factor question

    i was thinking of the installation i have nearly completed and i was thinking about the grouping factor issue, the cables are grouped in pvc trunking leaving the consumer unit and travel about 4 meters before entering ceiling before dispersing into seperate circuits.would a correction factor be...
  12. T

    pvc trunking limits?

    just a thought, i have been using some maxi trunking to suply cu going verticaly down the wall was wondering how far verticaly can you go with trunking before you need to support cables? also how do you judge how many cables to put in?
  13. B

    grouping factor of a cable with irratic use

    Hi Guys I am trying to work out a system to be run in a small church like premises with irratic use.the system is to be in trunking so grouping is going to be effected by using the loadings of each circuit(which is not for long periods)is there any way of over coming these restriants I know I...
  14. C

    Cable factors in trunking, conductors over 25mm^2.

    Hi All, I have been searching the forum but can't find this anywhere. Can you please see if my interpretation of this is correct: 50x50 trunking, 2m run with 1 90o bend. 4 x 50mm conductors, 1 x 35mm conductor. As there are no factors for over 25mm2 I have to work it out manually 50x50 =...
  15. sythai

    Conduit cable calcs....help please ?

    Just calculating my In... conduit with singles run. For the grouping factor - Cg it states number of circuits If I have 2 circuits, but this consists of 18 x singles (e.g 1 x ring = 6 and 4 x radials) Would this still be a factor = 0.75 ? Thank you Sy
  16. M

    Power factor

    Can any body give me the formula for power factor Given:kw=630 kvar=400 PF=? Thanks.
  17. S

    3 Phase cable sizing help?? Proceedure?

    i'm after a little help with cable sizing. I have tried reading my IEE design guide, and still struggling to get to grips with the correct proceedure to follow for sizing cables. I have always struggled a little with this, but thus far my knowledge goes (albeit shaky)... It>_ In/(Ca x Cg x Ci x...
  18. P

    correction factor for discharge lighting

    hi guys, just a quick calc here:- 4 X 400w rated lighting, is my calculation for this 1600/230 = 6.9amp X correction factor Type C circuit Breaker. thanks phil
  19. G

    Power Factor Correction Capacitors

    Hi, i am looking to correct the p.f. on a number of individual motors. I hope to use a small capacitor bank position locally to each motor. Can anyone recommend a brand/shop where I can get hold of these? Thanks,
  20. T

    power factor correction

    Well time has come to further my knowledge, now I know I was taught these at college but once i left i realised it was all about thinking from the neck down! So I know the rule of thumb is .8 but how do I apply these into calculations:freak:

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