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value

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  1. 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...
  2. 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...
  3. 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
  4. 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...
  5. 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?
  6. 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.
  7. J

    Wylex main switch

    Hi , could someone help me please , I did an eicr yesterday. Few questions now the ccu is the old Wylex board with push in type mcb's 3871 type , what is the main switch bs en number ? Can I say its a limitation as it's not evident ? the Ze I recorded is 0.63 ohms it's a tncs , is this a c2 or...
  8. F

    What value

    Ok so we no that for are insulation resistance tests 1 M ohm is the acceptable value well greater than that is but how do work out say for a 6 amp b type breaker how low would your reading have to go before it takes the breaker out
  9. matt1386

    Trainee - Advice please

    Hi all, sorry if this is in the wrong section, wasnt too sure where to post it Basically ive started college a few weeks late so im having to play catch up at home to get to where the rest of the class are at Ive come across a question on my work sheet which im not sure how to work out and...
  10. M

    Testing question

    hi all I am currently working as a mate the contractor I'm working for which I shall not name does the following test. he only measures zs doesn't do continuity r1 r2 he says that there is a good earth return if these results are within those permitted, he takes his ze from his zs to obtain his...
  11. S

    stand alone generator system

    any help on this one very much appreciated. We have a stand alone 3 phase workshop any generator installation. The supply is TN-S, seperate PE back to the generator, which has its own earth electrode. Ze for the system is in effect the short circuit impedance at the generator between a live...
  12. L

    Max Zs value

    Hi Would anyone be able to help me, Max zs value for type c 32amp RCBO on PME system- 0.72/0.58 or 1776 ohms? Any help would be appreciated
  13. HappyHippyDad

    Regulation 434.5.2 Fault current!

    Cant quite get my head around how you use this reg? Lets say S =16 I = 657 k = 115 You have to work out t first of all so t = K2S2/I2 so t = 7.843409 (to 6dp) therfore K2S2 = 3385600 The reg says that we need to make sure that K2S2 is greater than the value of the let through energy...
  14. V

    Good value or not?

    Saw this in B&Q today £50.00
  15. A

    Value Engineering

    Can anyone help me out with value engineering a job. I have a list of items that have been specified and I am trying to come up with alternative suggestions/ maunfacturers of the items that may be regarded the same in quality but cheaper in cost. Schneider Switch gear/ distribution boards...
  16. K

    Earth Fault Loop Impedence question

    hello, i got this qustion and would like someone to show me the working out of it please. the measured value of loop impedance for a circuit is 0.83 ohms. if the temperature at the time of the test was 20c and the cable is 70c (factor1.2), what is the correct value. ze = 0.4 ohms
  17. D

    Maximum Ze value for TNS and TNCS System

    I am wondering where the maximum values (0.8 and 0.35 ohms) come from. Why are they 0.8 and 0.35? Any help would be greatly appreciated
  18. Midwest

    Best Value LED GU10/MR16

    I have done some searching on this product on this forum,but most of the posts are nearly year old now and technology seems to be moving on. My son rents a two bedroom flat, which is totally populated with GU10/MR16 Halogen lamps. Like most parents, it falls to us it seems to replace the bulbs...
  19. H

    Cables in parallel

    A number of cables are tested for installation resistance. The highest individual value is 200M ohm and the lowest is 20Mohm. The measured value, when all cables are connected in parallel, will be? A. great than 200M B. 200M C. Less than 20M D. The sum of the individual values.
  20. S

    What a normal r1 = r2 result should be on a light circuit

    Hi, I just done a job today and got some reading of 7ohms, on continuity of a light circuit (B6 CB) this is the highest I have yet seen is this still ok? Or is this a problem? Cheers

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