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values

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  1. J

    Does freezing cold temps mean bad IR values ?

    i am testing 4 flats in the one close, high rise flats were being brought down next to them so tennants have been moved out for a few months, and its freezing cold in glasgow right now, when testing the house ring which is wired through conduit i am getting between 30 - 50 mega ohms going...
  2. N

    R1+R2 per metre - trying to test against book values.

    I find working as a labourer I never have to think about basic theory, so it's easy for me to forget. Doing some experimenting tonight with 11meters of 2.5 T&E and a continuity tester. End to end on the line 0.15ohm CPC 0.20 Ohm It's not exactly what I expect. Is the difference something to...
  3. L

    Insulation Resistance Values

    Hi, I am getting a reading of Live to Live = 195 MOhms Live to Earth = 0.75 MOhms at the distribution board I am working on a Highway depot. Are these acceptable values? If not... what do I to? Thanks, Lasowski101
  4. A

    High Zs values

    Just had a installation condition report done on my house in prep for selling it. It's an old installation, possibly thirty years plus with newer bits that I did in the late 90's. It showed up some high Zs results on the living room sockets which are on the same circuit that the dining room and...
  5. P

    Max Zs values

    Hi everyone, does anyone know or know where I can find max Zs value for 750A BS88 gG fuses. I did a periodic during a shutdown last week an was rushed of my feet. I can`t find anything on the web and can`t get back in to check the manufacturer.
  6. J

    Strange loop values

    Im I missing something ? been checking 2 x ring finals yesterday and found the following results :- R1 Rn R2 R1+R2 0.36 0.36 0.45 0.18 for length of est circuit r1&rn values seem about right 0.47 0.47 1.38 0.35 cant check length with this...
  7. A

    Max permissible ZS for rcbo 61009

    So, when I did my 2391 I&t course I was told to use to values in table 41.3 of the regs for max ZS value for rcbo which provide earth fault, and over load protection. Recently a colleague of mine said you should use the value in table 41.5 which states a max permissible ZS of 1667 ohms. I don't...
  8. U

    Ze Values? HELP

    As a guide in the 17th the max Ze readings for the following = Tns = 0.8 Tncs = 0.35 TT = 200 I Recently got a Ze reading of 0.15 on a Tns system, as its higher than 0.8 in the 17th should i be worried? If its ok, what Ze readings would you consider high for each of the systems? e.g time to...
  9. Doomed

    New Zs values

    Anyone seen a table of the new Zs values yet?
  10. D

    Max Zs permitted values..

    Hi guys n gals think I messed up my last post as it be gone... Anyhow got a question C32 30Ma 10k RCBO on a standard final ring with the same supply characteristics as ANOTHER final ring off the Db 6 inches from it... Live been going through the O/M manual and found the test sheets and these 2...
  11. C

    Amendment No3 Zs values

    Will attach a table of the new Zs values when I've worked out how to do it!
  12. D

    Exceeding max zs values on caravan site? With pme supply

    Hi all, first post on the forum and I hope you's can help me with a few questions I have. I have been asked to test a caravan site with the following details pme supply (with no individual spikes at hook up points) main 400a mccb with bolt on adjustable rcd(turned in the off position)i. I have...
  13. G

    Extraneous bonds values

    Can anybody point to a regulation where 0.05 ohms is the maximum allowed measurement between points.
  14. C

    Min PSSC Values of Type gG fuse, 10A 500V 10 x 38mm

    HI All, Struggling on this one. Anyone know where I can find the Min PSCS Values of Type gG fuse,10A 500V (10 x 38mm)? IEC 269-2 I've got a load of 230v lighting circuits protected by them but google is not my friend today...... So disconnection time of 0.4 seconds? Cheers, Gar.
  15. t01474

    Earth rod and Zs values in farm. Help needed

    Evening all. Am currently doing my first EICR on a farm and have come across the following. Supply is TNC-S. There are many stables on the farm and various outbuildings. At some of the stables / outbuildings a 3-core SWA has been installed but the CPC is not connected. Instead a separate CPC...
  16. H

    R1 and r2 values

    If I have an overall resistance can some help me figure out how I would work out just the r2 value?? e.g a ring final circuit is installed with 4.mm live conductors and a 1.5mm c.p.c if the line loop measures 0.44 ohms, what is expected c.p.c value?
  17. M

    Max ze values

    This may sound like a daft question but in bs 7671 does it state anywhere in it about max ze values ie tncs--0.35 tns--0.80 tt--21 I was jut wondering,I can find max zs but not ze ?????
  18. D

    Fluke Meter Pass/Fail Indication?

    Hi I have a Fluke 1653b and it claims to have Pass/Fail indication on RCD's ?? Where? Is this on the auto mode? I can only get it to auto test then I have to scroll through all the measurements. There is no mention of this feature in any of the manuals?? Help!!! Thanks
  19. N

    High end to end values plus three cables in one circuit

    Hi guys A little advice here would be much appreciated , it's been a long head ache day! Had a ring circuit in a house today with high readings end to end on all three , they where in there 40s , 50s and 60s but got a good r1 + r2 and a good Zs , is this normal to be able to have high end to...
  20. F

    Solid Aluminium conductor twin and earth tabulated Zs values?

    Hello, Board change today (domestic), cable is aluminium twin and earth - socket ring = 4mm/1.5mm, lighting = 1mm/1mm, oven 10mm/4mm IR all good, continuity & Zs are within values set for copper equivalents. This is not tinned copper. I have managed to find out that this cable was used...

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