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  1. P

    Wind uplift

    Ok chaps how do u approach the wind uplift calcs? ive not produced any yet!!!! but no i need to start!!is there any software that can sort it!! i no senior members have the brain to sort it via BRE but just want honest opionons on what u lot do!i cant be the only one trusting in 25yrs of knowing...
  2. J

    how to work out r1+rn (and R1and R2)from end to end readings

    How can I work out the P-N figure of eight readings and the R1and R2 readings from the end to end readings of the ring cct. This is because our certs are typed up as we go along on site, and I only do the end to end tests on the ring. Can anyone help pls.
  3. S

    Insulation Resistance Test with Fluke 1652

    I'm using a Fluke 1652c as my MFT. When I do the Insulation resistance tests at 500v - sometimes the result is displayed immediatley i.e >500 Megohms , other times the resistance seems to climb slowly, peaking around a figure. As this figure is generally massively in excess of the required 2...
  4. A

    TT system - maximum earth fault loop impedence?

    I've recently completed a part p defined scope course but all of our testing was on TNS or TNCS systems, in our house we have a TT system and in the OSG I can't find much information on the maximum earth fault loop impedence, just says that it is likely to be higher than their TN tables? I might...
  5. sparky3366

    figure this one out then...

    After fitting them and finding the easy to do, I go to fit a wireles timer/stat to mother in laws combi...a baxi 105e. Open the cover to find the neutral & live reversed on the main incomer for the boiler...fit the wireless receiver and put the wiring in the correct way, nothing. reverse the l&n...
  6. R

    voltage drop.

    6.9 v for lighting 11.5 for a socket. So my question is to calculate the size of a supply cable to a building that had lighting power heating for example. What figure would i use for voltage drop. Is there a wxtra safe rule of thumb method ppl use?
  7. S

    Working Out Amp Draw

    Hi When working out Amp draw (Watt/Voltage) for a domestic dwelling do I keep my voltage figure at 230 when in real terms the actual voltage as source is 246v So for a 7kw cooker I do 7000/230 = 30.43amps but at 245v its 28.57amps. Do I always use 230 as the figure for a domestic dwelling?
  8. La Poste

    Illegal gas fitters 'cost customers up to £100m a year'

    The cost of fixing botched work done by illegal gas fitters is costing customers up to £100m a year, according to the Gas Safe Register. It said 250,000 illegal jobs were carried out annually and one in five of those inspected are found to be immediately dangerous. BBC News -...
  9. Jay Sparks

    Monthly accounts help

    Hi Guys, Ive just started subbying for an electrical company doing testing and some day rate work. Ive sorted out how to do my invoice and day work sheet but I cant figure out how to SET out my monthly accounts on a piece of A4. Basically I will have roughly 4 incoming invoices and then what...
  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. M

    Very hard to figure

    Ok So I have a very tricky one for you all and need some help on it. Downstairs light has 2 gang 2 way switch One red to L1 another to opposite L1 One black marked as switch line in L2 another black marked as switch line in opposite L2 Finally 1 black marked as switch in L3 Ok so on to the...
  12. G

    Joining Kettle Lead to Figure 8 Lead

    Hi i was just wondering if it was possible to put the end of a kettle lead onto a figure 8 power lead? I moved into a property which has the cables going through the wall for the tv. My tv does not take the figure of 8 lead but the kettle lead. Thanks for any replys.
  13. T

    figure of 8 on a ring main

    Hi can anyone explain or show me a link on the internet / drawings on how a figure of 8 can be created with incorrect wiring, thanks
  14. M

    Part P Assessment

    Hello Boys. I had my assessment with Elecsa and i'm pleased to say I passed! Just thought I'd let you know the questions "he" asked me, so they may help anyone else taking the test. 1 How do you tell it's a TNC-S system? 2 What's the max Ze permitted for a TNC-S system? 3 What's the max Ze...

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