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factor

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  1. gazdkw82

    Power losses

    Going through some mock questions ready for 202 exam tomorrow. Our regular teacher didn't turn up today so we had a stand in. We had a question that no one (including teacher) could work out. Question is A load draws 9KW but works at only 85%. How much power will be lost in 4 hours. My...
  2. 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...
  3. R

    What power factor to use for motor?

    Wondering what power factor to use when working out design current of an old 25hp motor. Nothing on its plate. It's been wired in with a 32D MCB, on 4mm three core SWA XLPE. Thanks.
  4. gazdkw82

    Power factor confusion

    I'm really struggling to get my head around power factor. I understand there is true power (kW)/apparent power (kva) and reactive power (kvar) however I'm struggling with knowing how to work out say KW if I have KVA/KVAr and vice versa etc I'm currently doing a lot of mock exams (202) preparing...
  5. UKMeterman

    What is the power of this motor and ever seen one with unity power factor?

    What is the power of this motor, and would you consider it a quality product as declared on the label?
  6. 0

    3 phase cable selection and protective devices

    Hi everyone. I'm after abit of help calculating cables sizes and protective devices for a 3 phase DOL motor. I haven't worked on 3 phase equipment for many years and 3 phase calculations is as far back as college so please excuse my ignorance on the subject and not knowing answers to perhaps...
  7. A

    Calculating power factor with wattage and voltage

    Hello, I really need to know if it's possible to calculate the power factor from the voltage and the wattage... For example... 13kW, 400 V three-phase machine Thank you
  8. P

    Am2

    Anyone know the Power factor forula required for the AM2 motor starter? Really desperate!:omg_smile:
  9. M

    Power factor correction units

    Hi guys, I've just completed a job in moving 14 plastic / rubber injection moulding machines from their old factory up to their new unit, most have been supplied with 100A / 125A fuses from the busbar down to a local ISO and into the machine just to give an idea of the size of the install. Half...
  10. happysteve

    Current carrying capacity of a ring final circuit - grouping factor?

    Eh up :) I'm trying to challenge myself with scenarios where I'm not sure if my interpretation of the calculation rules + regs is correct or not. RFCs are doing my head in. I think I understand most of the theory: - 433.1.204 lists a specific case where a RFC protected by a 30/32A protective...
  11. V

    Generator formula

    Hi everyone, I am looking to know the formula for KW to Kva and any other related formula that you would know thanks v
  12. dlt27

    power factor correction

    Hi can anyone help please. I was asked the following question today. An organisation has determined their sites total power is 25KVA and it's power factor is 0.8. Calculate the site's useful power( including units). Could anybody please help or provide me with equation to calculate the...
  13. shnabz

    Power Factor Question

    A 230V, single phase machine, draws a current of 10A at a power factor of 0.8. Calculate the power dissipated by the machine. Is the answer 12.5A?
  14. shnabz

    2365 Level Drawings

    Does anyone have the 2365 Level 3 Drawings on a pdf file they could share with me? My college have been re-using old ones and the quality is horrendous, they have probably just been printing copies of copies. They are not very good when it comes to computers and won't give me access to walled...
  15. R

    Multiple 3 phase motors fed via a JB supplied with a 27 core SWA

    Looking into a site today, just changing an isolator, i found multiple motors are supplied via a 27 core SWA cable. The motors are only 1-3kw and are supplied as follows... Main panel ---(27core SWA)----JB----(7core SWA)----Motor The 7 core includes an isolator signal for control purposes. I...
  16. D

    Diversity factor and demand factor, confussion.....

    Hi, could someone explain me the difference between sum of individual maximum demand and connected load.... do you think it is the same, ? And the answer for this exercise is what exactly, ?I have some confussion in the calculation... A power supply is having the following loads, A domestic...
  17. spud1

    Calculation of grouping factor for 3 phase tails

    Hi, when determining a grouping factor for a galvanised trunking containing 3 phase tails, and when consulting table 4C1 BS7671 to determine the factor does each phase/tail count as a seperate circuit or are the tails considered in themselves one three phase circuit? Thanks
  18. LeeH

    Grouping Factor is giving me a headache.

    I'm in the process of completing my 2396 project (A college) but the due to the grouping factor I'm getting some unrealistic and impracticable cable sizes. I have got around some larger cables sizes by changing from thermoplastic to thermosetting and that has sometimes been just enough to drop...
  19. T

    Negative Power Factor

    During the commissioning process of a newly installed EDMI, CT AMR or smart meter, the meter was showing a negative or lagging power factor of -0.87. I understand the relationship between reactive and true/apparent power and the theory of how the power factor is calculated and used for billing...
  20. Resu

    High Voltage Sign and Transformer Rating

    Hi all, two questions that I am hoping someone can shed some light on. 1. What is a typical rating for a high voltage discharge lighting circuit, i.e. a large sign? Can't seem to find anything online and it's not the type of work we do. 2. I'm struggling to find out how to convert kva to watts...

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