value

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  1. Worcester

    Voltage Optimisation - The true value for homeowners ?

    Just got this in an email today, kind of sums it up really !
  2. G

    2394-5

    Q, The earth fault loop impendence measured for a circuit is L1.1 0.61 determine showing all calculations weather it complies with Bs7671 what do I need to do
  3. 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...
  4. E

    Twin and earth testing

    Hi, A quick question, maybe a stupid one .... but it baffles me ,and I cannot find any info on the net. If you do the continuity test on a lighting circuit to get your resistance values, wired in twin and earth, how do you the the value for the earth ? Obviously you link the earth and phase or...
  5. F

    rcd tripping times

    just a quick one doing some rcd tests today, and at x1 value the tripping time was 46mseconds and at x5 29mseconds now i no that as long as at x5 value is under 40mseconds all is ok just thought the x1 value was a bit high so my question is there a max value for times 1 as i must admit not had...
  6. S

    Expected r1 r2 value when circuit 16.5m long

    Hi Guys stuck: A ring final circuit wired in 2.5/1.5 Resis: per m 7.41 and 12.1 what is the expected value of (r2+R2) the circuit is 16.5m long
    • smthdeedog48
    • Thread
    • answer circuit long question value working yourself
    • Replies: 48
    • Forum: UK Electrical Forum
  7. D

    high pfc domestic property

    hi, fitted new consumer in a domestic house. testing. ze 0.16 zs at origin 0.04 pfc 6.2ka the pfc is my problem, ohms law would make the pfc work out around 5.7Ka (using 0.04 as your resistance) (with all paths in place) using megger 1553 two lead test, high current, pefc and pscc are the...
  8. NDG Elecs

    Wandering PSCC value. Is my meter goosed....

    Hi folks, Just a quickie.. Testing PFC earlier today, specifically PSCC... Got a reading of 3.4kA, then did a double check straight away and got 2.1....ooh I thought so tried again and again with values ranging between the two figures above. Never had such a deviation in quick succession with...
  9. driverman

    60947 Zs VALUE S

    Guys. how do I find the Zs value for a 80A 60947-2 10Ka MCB? At this point in time I don't know the make. Is this a new number for MCB's? Does it make a difference with different manufactures? Cheers
  10. S

    How to work out average earth electrode value

    Hi guys, im doing revision for 2394 and got a question on getting the average ohms value for an earth electrode test. the readings obtained were 179,181 and 185ohms and they asked for the average. i have checked GN3 but it ain't clear. can anyone give me a method of how to work this out. cheers.
    • Sb8389
    • Thread
    • average cheers earth electrical work electrode out question readings value
    • Replies: 2
    • Forum: UK Electrical Forum
  11. L

    2394 question

    Hi I am due to start the city and guilds 2394 course next month. I thought that I would have a look at some past questions to see what to expect. I am having trouble with one of the questions and was wondering if anyone could explain the theory to me. 16) The measured value of loop...
  12. A

    RCD tripping times at 1x and 5x

    I understand that when carrying out RCD testing an RCD should trip within 300ms at 1x and 40ms at 5x but is it common that on occasions for the RCD to trip quicker at 1x than 5x. I never had it occur personally. I am just looking at some old certs and on some circuits the RCD is tripping...
  13. T

    Can you work out the value of the resistor?

    Hi guys, Just wondering if you can help me on this one, I have a RLC series circuit the values are as below; R = unknown L = 800mH C = 300uF from there I have calculated; the resonant frequency to be 10.3Hz the capacitive reactance 51.50 ohms The reason I need to know is I need to work...
    • thepipersson198
    • Thread
    • access electrical work frequency impedance out resistor value
    • Replies: 4
    • Forum: UK Electrical Forum
  14. P

    Earth Fault Loop Impedance

    Hi all, I am hoping someone can clarify if my understanding on earth fault loop impedance testing is correct. A low efli is needed so a protective decive can operate in the required time, the lower the z the quicker it will operate. ZE= External resistance from borad to supply, board...
    • Patrick Griffin
    • Thread
    • circuit earth earth fault loop impedance fault impedance loop loop impedance measured value
    • Replies: 8
    • Forum: UK Electrical Forum
  15. B

    Hi, new to site hopefully I can add some value and LED expertise to the community

    Hello everyone my name is Ben, I'm one of the directors at www . ledstop, we specialise in professional LED lighting. I don't profess to know everything but I have a good few years of LED lighting knowledge under my belt, I hope I can help a few people out on the site whilst learning something...
    • Ben Hopkins
    • Thread
    • advertising community don't hopefully led lighting new site plan value welcome
    • Replies: 1
    • Forum: The Welcome Forum
  16. N

    Megger mft1710 multifunction tester - nottingham

    Megger MFT1710 electrical tester Very Good Condition Received in part exchange when i sold my old phone. I have no use for it and i'm only interested in getting the cash it owes me. Comes as pictures with ***no box***. I've browsed through eBay and know the value of these tester's so no silly...
    • Notts
    • Thread
    • megger multifunction multifunction tester number phone tester value
    • Replies: 10
    • Forum: For Sale and Wanted Forum
  17. S

    R1+R2 of a ring circuit

    I know you take the highest reading, though not sure if you take the highest reading on the ring circuit or a spur off the ring circuit? cheers
    • Ste69
    • Thread
    • circuit highest r1+r2 reading ring ring circuit value
    • Replies: 24
    • Forum: UK Electrical Forum
  18. onions1066

    Bringing Zs value down

    Just a quick question, need to add some lighting to an existing circuit, during Pre tests found zs value exceeds maximum permitted, it is a long circuit to be fair around 200m, it is 1.5mm twin. It is on a 10amp type b at the minute cant drop it to a 6A due to the amount of fittings on the...
  19. M

    Earth Faulth Loop Impedance HELP!!!

    Hi can somebody shed some light upon correction factors for earth fault loop impedance. I know that the vales of zs in bs 7671 are if the conductors are running at max temp ie worst case scenario , am I right in believing that if you get a measured result you apply 0.8 to it?
  20. T

    AC Circuit Theory Maximum Power Transfer

    Hi Everyone, I'm trying to determine, for the network shown below the value of the load Impedance that will dissipate the maximum power and the value of this power.I already calculated the Rth , but I'm stuck on P=I2R.Can someone help please? Thank you.
    • tonydee
    • Thread
    • attach circuit maximum power value
    • Replies: 0
    • Forum: UK Electrical Forum

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