values | Page 5

values

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  1. F

    pscc pfc values

    just done eicr on a 3 phase db LI= 1.33KA L2=1.44 L3=1.48 THESE ARE THE PSCC VALUES SO ADDED TOGETHER THEY GIVE ME 4.25 KA THE LAST TEST DONE 5 YEARS AGO WAS 5.5KA NO WHAT WOULD CAUSE THIS TO BE LOWER NOTHING HAS CHANGED IN DB AND I NO THE READINGS ARE ACCEPTABLE YOUR THOUGHTS PLEASE
  2. M

    Calculating Voc (STC) & Isc (STC) values

    I have taken the Voc, Isc and Irradiance measurements for my strings and entered these on my paperwork, but I do not know what values I am supposed to be entering for the Voc (STC) and Isc (STC) values in the Array Parameters section of my paperwork. Looking at the same paperwork from another...
  3. M

    R2 Testing Help

    Hello i havent done much testing before so i am trying to brush up on my Testing skills before i join Elecsa, i have a couple of questions about R2 testing please. I understand how to carry out R1 R2 tests using method 1 and that we do them to calculate the Zs of our circuit Zs=Ze+R1+R2 But i...
  4. L

    Visual Building Solar Designer _ Irradiance values

    I have been told by several users of Visual Building Solar Designer that while using the software to calculate the FIT, they like the feature to select the local irradiance values from a map. However I also just heard from another user, that they have been told to use a single irradiance value...
  5. ringer

    Continuity of ring final circuit conductors

    Why is it when you cross connect the conductors at each leg and then test continuity, the result is one quarter of the combined resistances of the legs? I am usually pretty good at seeing how/why calculations work out, but just cannot in this case get my head around why the value measured is a...
  6. S

    PIR Insulation Resistance Test

    Just had a PIR done for a house we were hoping to buy. The house - victorian/edwardian terrace - has 8 circuits and the wiring is approx 20yrs old according to the PIR. The report gives the same reading for ALL circuits. Live-Live is 1.01 Mohms and Live-E is 0.17 Mohms. Continuity Polarity...
  7. D

    Acceptable Ra values

    Ok....I'm clearly in a minority on this. So to all the guys on here who install small scale TT systems some questions. What value of Ra do you accept? What values of Ra do you aim for? How far do you go to achieve those values? If you cant achieve your desired value (ie values comparable to a TN...
  8. F

    Help to understand pfc pscc values

    Can some one explain if your pscc value is say 4.6ka well in gn3 it says that your protective device must not be less than that value so say the protective device was 5ka how would the protective device trip if it's fault current was only 4.6ka please explain cheers lads
  9. K

    Confirm the +/- values

    Could someone please confirm the +/- values of voltage supply in the UK. (With a reference, now I’m pushing my luck)! I’ve always worked on –5% to + 7.5%. the first plants I worked on were all supplied at 11400V so all transformers had the taps set at +2.5%. I have looked and it’s like...
  10. B

    Is there a test Cert for earth rod testing

    A project engineer has requested a test cert for an earth electrode test on an industrial site earthing system is there a test cert for this? Thanks
  11. S

    Zs values list

    Here is a full 10 pages of Zs values of almost every fuse and MCB hope its helpful.
  12. M

    How to calculate temperature adjusted maximum Zs values

    Hello, I have my practical 2391 test on Friday and have been told by the examiner that we will be required to complete the calcuation for the maximum operating temperature for Zs. I am unsuse what to do with the calculation. From guidance notes three (second example down, pg 113), it...
  13. B

    Low ZE values

    If I have a very low Ze Reading ie. 0.06 ohms and a Zs Reading on a 40amp shower circuit of 0.1 ohms under fault conditions for instance dead short at pull cord could this cause the main incoming fuse to blow before the mcb trips?? Thanks any input would be appreciated.
  14. S

    r1 + r2 values

    I am going through my college notes for my AM2 starting tomorrow and i am struggling to find the table which shows allowable R1+R2 values i only have the new green books to hand any advise would be great however i think it is the old red books that are provided, i have a feeling i am missing...
  15. S

    R1+r2 values for steel wired armour

    Hi all can anyone tell me where the values for r1+r2 for swa are in the regs or onsite guide, can't find them, thanks chris
  16. silver surfer

    Voltage optimisation

    A client of ours are having an 800kva optimiser installed presently. So its got me thinking, as being as its basically another transformer (dare i say an isolating transformer? although i stand to be corrected!), will this effect the existing Zs values throughtout the installation? Rather like...
  17. D

    calculating max zs values please

    hi chaps, could some bright spark help me out here, i have loads of periodics comming up and am getting fed up of looking up zs values for new and old MCBs, i kind of know the basic maths behind the values but could someone clarify how to work it out on site so max zs values for type 1,2,3 mcbs...
  18. silver surfer

    BS7671 V GN3 MAX Zs Values

    Not trying to nit pick....but. Table 41.3 max Zs etc are at 100% values whereas GN3 table B.4 show 80% values but some of the values in GN3 are not even close to being rounded up. For example a type C 32 amp bsen60898 = 0.72 in regs book GN3 =0.62 for the same device. but 0.72x 0.8=0.58 at best...
  19. L

    Capacitors and uF values...

    Hi. I have taked out a Tesla capacitor control box from a lake, it had totally melted! The control panel is underated for the pump it controls. Anyway I can get the correct rating control box but the capacitor uF value is different. The original one is 35uF and the new one would be 60uF. Is...
  20. T

    Frequent PIRs - any evidence of benefit?

    Is anyone aware of any evidence that performing very regular PIRs, e.g. yearly, is of any benefit? Are there any trends that could usefully be determined from the measured values on the PIR? Thanks

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