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  1. 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...
  2. 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
  3. 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...
  4. 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...
    • m top
    • Thread
    • carry cutting heard question testing tests value
    • Replies: 20
    • Forum: UK Electrical Forum
  5. 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...
    • scammell man
    • Thread
    • alone earth generator stand system value
    • Replies: 2
    • Forum: UK Electrical Forum
  6. 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
  7. 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...
  8. V

    Good value or not?

    Saw this in B&Q today £50.00
  9. 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...
  10. 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
  11. 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
  12. 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...
  13. 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.
    • hsharp
    • Thread
    • cables images parallel resistance value
    • Replies: 43
    • Forum: UK Electrical Forum
  14. 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
    • scintillasam
    • Thread
    • circuit light normal point result start switch value
    • Replies: 24
    • Forum: UK Electrical Forum
  15. Paul.M

    Computer RFC Testing???

    I'm scratching my on this because I've never done it before. I'm on a new build school wire with quite a few computer RFC's using 2.5 T&E + a 4mm single Earth that we are just pulling in now. When it comes to us testing these circuits, how do I/we record the results? Both the 1.5mm CPC and the...
  16. T

    3 phase pfc

    Hi all In order to measure your pefc pscc, you need to test across all 3 line conductors then multiply by 2 record the highest value, this is correct isnt it.
  17. C

    Underfloor Heating programmers.

    Posted this in the heating section earlier but didn't get a response. Any help would be great. Thanks. Hello, I recently attended a job where the underfloor heating programmer/ thermostat was broken. When chatting to the wholesaler to find a replacement he warned me that I would have to get...
    • Chris Electron
    • Thread
    • heating switch underfloor underfloor heating value
    • Replies: 3
    • Forum: UK Electrical Forum
  18. N

    Actual Trip Value

    i know some, probably tel will make a joke about this, ..i can see it coming so i'l get in first :this isnt about bad value day outs:) sorry tel :) So ive read many posts on this subject and opinion seems divided. On testing a MEM 100he mains switch rcd with all breakers off,link from the main...
  19. S

    Fluke 1654B loop measurement - how does it measure the Re bit?

    Hi Guys, I've just swapped over to a Fluke 1654B MFT and I have a question about measuring the Re using the loop test function. Anyway, on the full caffeine loop test there is a little button where you can toggle the lower display to swap between PEFC measurement and the Re element of the Ze...
  20. F

    Discovering electrical industry value chain

    Hi, I am a businessperson educating myself about Industrial sectors. I am working on an Internet based information providing project which has placed Electrical industry at its cornerstone, and subsequently, adding other industries to the equation that create a value chain to Electrical...

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