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value

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  1. J

    Testing help

    HI All Have just installed a new circuit to supply power to a control panel. Have tested it all came back fine if i need to carry out a ZE test how can this be done because cannot isolate the main board so cannot disconnect the Main CPC from the MET Also have only carrird out a ZS at the...
  2. M

    Max Earth Fault loop impeadances for400A bs88 5 secs

    Hi their does anyone now were i can get maximum earth fault loop impedance for a BS88 400A fuse with a disconection time of 5 secs cheers danny
  3. A

    mybuilder.co.uk, ratedpeople.com who is good value?

    Hi All, Can anyone recommend a website that provides job leads I have used rated people and myworkman but I never get a response from the customer and often if we call them the numbers don't work. I don't mind spending the money even if we don't get the job I just want the opportunity to...
  4. M

    mft value 4 £

    just wondering your thoughts second hand Megger 1552 v new Metrel Mi3100 any thoughts appreciated, cheers in advance.
  5. M

    Ian Brown tickets for sale

    I have 6 tickets at £25 each if anybody is interested. Venue is Manchester Platt Fields next Friday (11th June). All my mates have now decided they can't afford it after I bought the tickets. If I'm breaking some kind of rule by advertisng these I don't care, I'm a rebel without a cause.*...
  6. M

    Main bonding value

    Hi all, just took main protective bond (10 mm) to water pipe which is of the old lead type. Main bond length is about 4 meters. Cross bonded to rads and sink(utility sink) Then did R2(using 2.5mm) to pipes under the kitch sink. Reading was 0.10 ohms. regs say max allowed value is...
  7. J

    think ive just stuffed my am2

    On the m.i.c.c cable the 3 phase from the board the resistance between each phase is about 88 mega ohms so think ill get marked dorwn for that also the in the board the conducters are about an inch short of the breaker the only thing im pleased with is the conduit oh well got another 2 days of...
  8. J

    r2 testing

    Please forgive my lack of knowledge on this subject.Normally when i have done pir tests i have used the r1+r2 method . To obtain the Zs you obviously use the formula Ze +(r1 +r2 )=Zs example Ze =0.02 r1+r2=0.46 therefore Zs=0.48 I have just been using the R2 method...
  9. Y

    Earth Fault

    I have recently fitted some lights in an attic and when I came to testing found the cpc showing 60 volts. I switched each mcb off in turn and the fault dissapeared when I turned off the downstairs lighting mcb. I am going back this weekend to sort the problem out so will start with an IR test...
  10. J

    Earth fault Loop Impedance Question

    Hi All, Q: If an earth fault loop impedance instrument records a valve of 0.55Ω at 20°c, what is the corrected valve ( Using the rule of thumb method ) to allow for conductor maximum operating temperature? Any replies will be appreciated.
  11. Golden_Boy

    R1 and R2 Maximum value

    Am I right in thinking that for any ring circuit the maximum value that r1+r2 can be is 1/2 the loop reading on the phase + 1/2 the loop reading for the cpc ( measured at the CU ) Or has my maths let be down?
  12. D

    High Ze Value on TNS

    Hi all, Could someone please advise me what the standard procedure would be if you were to get a high Ze reading of 8 Ohms. It was a TNS earthing arrangement. Main earth was upgraded to 16mm, gas and water both verified at 10mm. Im figuring that i will have to liase with the electrical...
  13. M

    Earth rod value ??

    I tested a TT system today earth rod impedance was 1467 ohms, I say thats a pass ie, less than 1667 ohms, the QS at work says that it's a fail, it must be less than 200ohms......who's right ??? and why ??:confused:
  14. I

    voltage drop

    with the value for volts Mv x Ib x l/1000 7.3 x 39 x 28/1000 = 7.97 V how can i comfirm this value is acceptable??? any help would be great :cool:
  15. S

    Acceptable Ze value for a TT System

    Hi All Hope you are having a good day. What is an acceptable Ze value for a TT system?? I know TNCS = 0.35 and TNS = 0.8. Cheers Dan
  16. S

    Good Value Flyers and Buisness Cards

    Hi Was looking for a supplyer for Flyers and Buisness cards and came across this website. Fort I would post it so you can take advantage of the offer too. Size: A5 Quattro Print UK - full colour brochures / flyers / leaflets / posters / envelopes printing Dan :D
  17. J

    Calculating Maximum permitted cable length with maximum Zs value?

    How do l calculate the maximum cable length for a maximum Zs value? Isn't there also correctional factors to be applied for ambient temperature? :confused:
  18. P

    rho value

    i'm in year 3 and i'm stuck on a year 1 question, is there any hope for me?? i was wondering if someone could jog my memory on this 301 question please. question: A copper conductor has a rho value of 17.5 x 10-9. calculate the resistance of the copper wire if it's length is 20 meters and...
  19. Archie

    RCBO's

    I have a question, When testing a circuit protected by an RCBO, lets say a type B, in the max permissible column do you put the value from the Regs for the breaker type or 1666 Ohms? Rang the NIC Tech line and NAPIT's and they both say different. It's just that if you put the value from the...
  20. D

    Help Please - max earth fault Loop Impedance value table needed urgently

    Hi everyone Would be really grateful for your help on this. I have my 1st NICEIC assessment on Monday (am bricking it) - anyhow I only have an old table & I need one like you get on the back of the proper NICEIC pads - the most up to date table. Has anyone got one they could send me so...

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