value | Page 7

value

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  1. D

    Rubber insulated tinned copper value??

    Does anyone know how much this tinned copper weighs in at the scrappies???
  2. F

    earth loop on rcd

    am i right on saying, i have tested two ring mains on db, they are 32a b type breakers there eli tests came back as 0.60 0.58. these are acceptable values, table 2d osg these circuts are protected by a 30ma rcd does this mean these readings would still be ok to the value of 1667ohms as stated on...
  3. G

    PFC with Fluke 1651

    Hi Guys I use a Fluke 1651. When testing Loop Impedance the tester calculates Prospective Fault Current by diving the measured mains voltage by the Loop Impedance and it displays the result at the bottom of the display as Ik PFC, I was wondering if this method that the fluke uses is the same...
  4. D

    Branded Workwear!!

    just took delivery of my new work wear and im overwhelmed!! its class!! can highly recommend Kimberley @ www.logo-co.com (it also helps that she was quite fit) lol....! will upload some photos later of my new gear!
  5. J

    general testing questions

    On a PIR test to confirm Zs values i obviously go to thr BRB page 48.But when do i use the rule of thumb i.e 80% Method ?. I understand there are differences between a cold install to one that is in service as resistance changes when cables are warmer. On previous posts i have noted to qualify...
  6. L

    The value of Ze on a TNS system useing an earth loop impedance test Instrument

    The value of Ze on a TNS system useing an earth loop impedance test Instrument list the steps in the procedure and the reasons for each step, I think this is right ? 1.Select appropriate test Instrument - It needs to be able to read Ze (low ohms resitance metere ?) 2. Perform safety check (...
  7. D

    MK SENTRY 5945s Breaker problem

    Hi guys need help, not mentally though haha... Er, i dont usually use MK but i used it for one job and have a problem.... Did all the test, all ok, got to office and found out the 5945s MK sentry 45amp breaker doesnt have a earth fault loop impedance Zs number in the BRB7671 or my 80% value...
  8. D

    length of ring main circuit

    what is the max length these circuits can go to in 2.5mm t & e ? 32a mcb with an installation method of clipped direct, just curious :confused:
  9. D

    Lowest n/e Ir value for a rcd to trip does anyone know?

    Can anyone tell me how low the Ir value would be n/e for a rcd not to hold in! Would like to know as I always get problems prior to changing fuseboards
  10. telectrix

    max Zs, Which Value

    Max. Zs values for Mcbs given in table 41.3 BRB. Correction factor of 0.8 applied in OSG. This correction i believe is to allow for temperature variation, but in my experience, cables rarely go anywhere near 70deg. esp. in a domestic situation ( some exceptions with high current appliances like...
  11. D

    Zs value

    how can i improve my Zs values at several distribution boards on 3 phase industrial site. tncs.
  12. T

    Voltage drop help please!

    Hi, i am confused about how voltage drop is worked out and need an answer for the following please; Work out cable size and cpc size you need when you have: Cable length = 50 metres Ib = 32Amps to get a voltage drop that complies with regs i.e. below 5%(11.5 Volts). It's wired in singles and...
  13. N

    Help Please with Parallel connection affect on Resistance!

    Hi i have this question that i am not sure of the answer. Can you please Help? State the effect on measured resistance when cables are connected in parallel. Answer: The resistance value will be reduced. For example in resistance for Zs testing in ohms has a measured value that is...
  14. D

    Fluke 1653b tester problem?!

    Hi, new to the forums here, thought id ask some advice from you guys. Basically i just bought a 1653b Fluke multifunction tester. My problem with the meter is that i cant seem to zero out the leads. Heres my understanding of how i should be doing it (note this isnt working for me!) -...
  15. S

    Good Value Security suppliers

    HI all, I'm looking for some fresh security suppliers for the london area. Good value companies that can handle small to mid, and mid to large security projects, with intruder, access control, CCTV options. Can anyone help please? thank you in advance.
  16. J

    Wierd no trip impedance value

    Whilst testing the earth loop impedance on a circuit in a church the value given by the regular loop test is 1.74 but when doing it on non trip (with the neutral lead connected) we got >200. Has anyone any ideas on what could cause that? Thanks
  17. B

    low value insulation resistance

    what could cause low value insulation resistance other than a latent fault
  18. W

    does anyone could help,high Zs value

    Hi evryone!!!just have a question regarding testing,today i have tested an installation,and the values r quite unexpected to me as i have done many tests so far but i can not explain why is like that? i have got PFC measured 8,6kA which is high , i have measured Ze it comes to 0,04 ohm. And...
  19. S

    Resistor value ?

    I am trying to find the resistor value of Rx in this diagram, can someone please help.:confused:
  20. Jimmy Boy

    Board upgrades remote to main CU

    Apologies if this has been asked before but I can't quite put my finger on the answer searching threads. 1) If you changing a CU that isn't the main CU but a downstream one ie garage, you fill in all the data on the cert. as per normal but Ze and PFC at the origin is that actually where the...

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