figures

figures

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  1. I

    Volt drop calculations

    Just curious as to when people are calculating volt drop, how close you allow your calculations to get to the 3% and 5% values before you decide to up the cable size? For example, if your calculations brought you to 11V for a general circuit would you be OK with that?
  2. C

    are these figures right or am i way off

    could anyone take a look at these figures please and tell me if they are ok or not. thanks in advance watts where stated 60w x 3 60w x 3 Ib design current 1.30 1.30 In device rating and type B6 MCB BS 60898 B6 MCB BS 60898 Reference method METHOD B METHOD B Ambient temp in...
  3. HappyHippyDad

    Working on electrics with 2 supplies.

    I have little knowledge of PV. When working on circuits supplied by a domestic CU, is it fine to just have the main switch off in the CU or should you be isolating the PV as well? The stickers all over the CU's in this example all say to disconnect both supplies.
  4. M

    confusing figures between net and regbook

    Hiya lads a stupid query (maybe ) i was filling in an EICR for a mate and had left my on site guide and reg book at home so i decided to check the net for max zs values for 60898 type b mcbs 6a. 16a, 32a, and 40a but the figures didnt match up with the ones in the reg book. so question what...
  5. B

    Electrical Test sheets & Fudged Figures

    I need some advice, I've been doing the OM manuals for installations and come across an electrical test sheet which I believe is fudged. Background of the story, is the handwritten one (NICEIC System was playing up) went walkies. Lost, never to be found. The QS produced the handwritten one, but...
  6. Harrykendal

    Require help with testing figures

    Hello everybody, I'm new to this forum and require some help. I'm an apprentice electrician studying in my 3rd year of college and have currently just passed my test and inspection exams. However I am struggling on 1 thingo_O. Don't get me wrong, I know how to test and carry out all procedures...
  7. Mark.W

    IR connundrum

    Hey Guys I've got a bit of a head scratcher that I was hoping someone could help with. I have a ring main feeding 7 points. When testing IR btw L&N I get 967Mohm but when testing N-E & L-E I get 455Mohm. I split the ring and tested as 2 radials and the results suddenly come back all clear at...
  8. B

    solar pv facts

    I have some goon coming round tomorrow to give me solar panels for free apparently. Free panels, free installation the full shooting match. I know very little about pv and I've never worked with it. Looking for some facts and figures please gents is this too good to be true?
  9. Dan

    ECA responds to October Green Deal figures

    ECA Head of Energy Solutions, Bill Wright, responds to the October Green Deal figures Read the full news article
  10. HappyHippyDad

    Voltage drop and it's effect?

    Hello all, just been thinking over Voltage drop!! 1. Where does the 3% and 5% figures for voltage drop (VD) come from? Appendix 4 (BS7671) gives the figures but why the different values between lights and sockets? 2. Also permitted voltage levels are -6% and +10% from 230V giving a min of 216V...
  11. M

    Second Year End Figures Are In...

    Year One (2012 - 2013) gave a total income from the Norweb Federation of £455 Marry in to this a saving of £80 in gas (based on a reduction in use from 2011-2012) and £90 electricity total income from the system was £625 (12.5% return on investment) Total Generation was 13 KWh over SAP Year...
  12. G

    schemes

    Recently there's been a lot of talk about scheme registration,and the need to be a scheme member to do part P work,now while a lot of sparks disagree with the way that the schemes infer that the only sparks that do a good job are scheme members,which incidentally we know not to be the case as...
  13. Dan

    ECA queries Climate Change Minister’s Green Deal figures

    The ECA responds to Climate Change Minister Greg Barker’s claims that around 300,000 measures had been installed through energy efficiency schemes to the end of September. Read the full news article
  14. M

    Wind Calculations

    Hi Had our two day MCS audit this week. Three technologies produced two non conformances . Solar PV and solar thermal ...no wind load calculations. Having read the entire section on wind calculations I am still at a loss as to how to do the calculation and what to do with the figure when...
  15. E

    Panel Performance Loss over Lifetime, reflect in k/Wh/ROI figures.

    I'm just trying to get some clarity on the above. We currently develop EPiSOLAR, software for people involved in Solar PV sales. At the moment we don't include any figures for panel degradation over lifetime, I've been in contact with MCS who have referred me to RECC who have been unable so...
  16. P

    Zs reading in workshop

    The last problem I have to finish the paperwork is that I have a Zs @DB reading from the house CU of 0.31ohms with a Ipf @ DB of 0.74 ka. On the test result sheet for the workshop, which has a 40amp rcd, 2 x 20amp socket radials and a 6amp lighting curcuit, what figures do I use to add to the...
  17. G

    [unofficial] No FIT cut until 1st August, quarterly installation figures show

    I was going to post up my table showing the quarterly installations to date vs the trigger points, but it looks like a pain in the arse to do it, so please see all the details and analysis on my blog article instead > Next FIT cut postponed until 1st August 2013 < obviously it's unofficial...
  18. B

    First Anniversary Generation figures

    Today my 4kw system has reached its 1st anniversarywith a pleasing 3338 KwH generated in last 12 months. System is 16 Hyundai 250Wpanels facing due west and SMA 4000TL. This is some 433w over the SAP, which I suppose is normnowadays. My friends 4Kw system, which is split equally east, &...
  19. R

    SAP2009 v9.90 where do they get the Solar Irradiance figures from?

    Throughout the document 53.4 N is used on a lot of the solar tables. However, when it comes to solar PV and for that matter solar thermal the table does not state its origins. Does anyone know where this data is based? Most people seem to believe it is Sheffield (which is 53.4 N) and the old...
  20. K

    Not good DECC figures

    Re the below: http://www.decc.gov.uk/en/content/cms/statistics/energy_stats/source/fits/fits.aspx We are offering 4kW Yingli @ £6199 but very quiet. This is with a 15% return. What's happening?

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