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  1. S

    Thin-film panels, anyone using them?

    Before crystalline panels had started dropping in price there used to be a lot of interest in thin-film... Usually lower efficiency (which doesn't actually matter if you have space) but also lower price than crystalline... Just curious whether any of you use thin-film panels and whether you...
  2. G

    Wake Fronius IG TL Inverter to check software version?

    Has anybody updated the firmware on a Fronius IG TL inverter via USB? I've read a Fronius PDF guide that states if the software version of the 'Display Software' is lower than SW V1.1.1.0 and the software version of the 'Power Stage Software' is lower than SW V1.1.0.0 then an update is...
  3. S

    Fault finding issue help please

    I have installed two strings of eight panels on a single story building. The top row of eight seem to be performing well. But the bottom string performs only about half to two thirds of the top. Midday results yesterday which was sunny ....... String 1 240v and 1113w String 2 261v and 493w...
  4. S

    Petrol generator frequency

    I'm considering buying a used petrol generator but there seems to be some confusion as to what the output frequency is, 50 or 60 Hz. Is there any way of finding out the output frequency of a generator? If it did turn out to be 60 Hz, could it be changed to 50 Hz, and if so, what needs to be...
  5. E

    Leakage Voltage

    Guys I was tracing a fault out in the garden of a client today and came across a set of driveway drive over lights, This isn't the LED type but a replacable GU10 lamp. I noticed that one of the Stainless covers was loose and found that it had come adrift from the fitting letting moisture onto...
  6. B

    Class 1 - Insulation Resistance lower legal limit?

    Hi Guys, Could you guys tell me what the lower legal limit is on Insulation resistance for Class 1 appliances? We raised our own test limit some years ago to >5m ohm due to certain units failing when installed on site and us getting increasing warranty call outs to fix them. We narrowed it...
  7. R

    Ze+(R1+R2) is lower than measured Zs

    Hi All, Currently in the process of my NIC application. Completed one job and had it signed off. Just installing a socket at home on its own circuit directly under CU. Going through my test results cant understand the difference in readings. Measured Ze is 0.12 Measured R1+R2 is 0.01 Was...
  8. D

    Minimum start voltage & operating voltage

    My latest customer asked me a goodun: He noticed from the SMA SB2500HF installation manual that its "startup voltage (adjustable)" was 220V but the "minimum voltage" was 175V. His question was why not make the startup voltage as low as possible so the inverter kicks in earlier.. I promised...
  9. sythai

    Bit of help please.....TT - PIR

    Hi Chaps... Just a few questions need a bit of help on please, just completed PIR on TT system this morning: 1/ BS3871 mcbs? Code 4 ? 2/ Readings on ring : r1=0.57 rn=0.57 r2=0.20 ? Any idea what may have happened here, somebody done a bit of an alteration maybe ? Code 2 ? 3/ Zs lower then...
  10. P

    Lower back pain - backlife machine

    Anyone suffer from it and tried one of THESE or know anyone who has tried one? Getting sick of the problems with my back:(
  11. P

    Jb's behind kitchen wall cuboards

    Given job to lower sockets in kitchen to allow for new wall units. The cables won't reach the lower postion and lifting up the floor boards above to pull back and jb isn't included in the price.If I were to put the jb behind the wallcuboard would that classed as accessable? Really cant see any...
  12. D

    Books did not sell-PRICE LOWER

    Hi guys, 2 books didnt sell and I have lowered the price, they are invaluble if you are studying level 2 & 3 electrical installation, grab a bargain reposted on ebay!!!! Basic Electrical Installation Level 2-2330 Tech Cert on eBay (end time 18-Jan-11 18:34:51 GMT)
  13. La Poste

    TT Earth and Neutral voltage.

    Just out of interest if a TT system is installed with a decent earth rod what sort of voltages exist between the Neutral in respect to real earth potential of 0 Volts? What's the average Neutral to Earth voltage, does it fluctuate from time to time? Does it get dangerous??? Thanks.
  14. C

    back to basics higher the volts lower the amps?

    hi guys am i right in saying that generally the higher the amps the lower the volts ?? watts divided by amps = volts watts divided by volts = amps amps x volts = watts taking that in mind a 12v extra low voltage spot light which is 50 watts = 4.1 amps 240v low voltage 100w bulb = 0.4...
  15. Y

    Customer demanding lower socket heights

    I've a customer today that went right off into one when I started installing the sockets at 450. The house was a bungalow and has had a new roof put on it to make it a house, with 2 more upstairs bedrooms. I was always under the understanding that this sort of work is classified as a new build...
  16. K

    Zs high at db lower in field.

    hi guys, this is a good one, a db which is quite away from main incommer so off busbar to mccb etc. anyway the zs at the db is quite high say 0.59 then out in the field the sockets and lighting circuits and ringmains are a much lower zs, for example 0.35 on lighting and other various...
  17. S

    Zs live Testing - does everyone do it?

    Zs live Testing - does everyone do it? Or do you use a calculated Zs instead

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