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  1. M

    Industrial roller shutter door help

    Hi guys iv got a indutrial roller shutter door at work which will only go up about 2 meters and stops in the same position everytime when you push the up but it will not go any higher but can be lowered n re hightened to the same position and cuts out. Does anybody have an idea what this could...
  2. Z

    Roof Blind motor faulty?

    I have been asked to repair a faulty roof blind. I have checked mains to the transformer, DC from the transformer to the switch and DC from the switch to the motor. The switch meters correctly when disconnected, ie. when pressed one way the contacts in a line become short and the other way...
  3. E

    Time limit for NVQ3 2356

    Hi all, Does anyone know if there is a time limit to complete my nvq in? Is it down to the college or do c&g put a limit on it? I think there are a couple of nvq assessors on here?? But all who are in the know are permitted to answer ;-) I started/registered for the nvq nearly 2 yrs ago but...
  4. I

    Roller Shutter Limit Switches

    Hi, Does anyone have a wiring diagram of a typical roller shutter limit switch config. My shutter is working but I would like to see what the switches are actually telling the board. I could get a ladder out and measure the voltage on the screws but a nice diagram would be better ;-)
  5. S

    What if active power reach inverter limit and I want to adjust the reactive power too

    Hi everyone, I just curious when I adjust the reactive power (via power factor, etc) and at noon the PV array will generate the full power that reach the limit MVA of inverter. For example PV array at 1 MW and inverter limit at 1 MVA if I adjust the pf to 0.9 what the result can be at noon? 1...
  6. M

    pm not working

    Hi guys my private messaging ain't working is says error post count too low. But I have posted around 8 times already how many do I have to post before I can use pm thanks in advance
  7. D

    Long strings and the 1000V limit

    Hi, We're just installing a 10kWp system made up of 43 panels & an SMA ST-10000 TL inverter. SunnyDesign recommends two strings made up of 24 & 19 panels. That fits very nicely with how we want to physically lay out those panels. The panel's Voc is 36.7, Vmax is 28.7 and the system's Vmax...
  8. S

    How long does DNO approval last for?

    It looks like one of my customers may be having an electricity supply installed. If we ask now we can have single phase that will take 10kwp which seems sensible. The cost of getting the supply is expensive and so there's only enough to pay for 4kwp after installation at the minute. If we get...
  9. La Poste

    Timer relay question

    Greetings. I have a question about timer relays. Basically what I want is a Din rail mounted timer relay that operates from a trigger pulse from a garage door limit switch. As the door travels up it hits the limit switch and from this the coil of the relay is energised and hence the relay...
  10. P

    Confused about 3.6KW limit

    Hi all, great forum been looking for something on Solar Pv for days now. Been reading here and saw mentioned a couple of times that inverters are capped at 3.6KW feed in? My question is if I have been quoted for a 4KW (a touch under 4KW actually) system but wouldn't the difference be wasted...
  11. SolarCity

    CRC energy efficiency scheme

    Has anyone had any experience of this scheme and considered how it affects the PV industry? My understanding is that companies will have to pay £12 for every tonne of CO2 that they use. It seems to me that this is not a fat lot at all and largely insignificant if you were factor it in to...
  12. S

    telemecanique limit switch query

    Hi allwe have got a telemecanique limit switch on a sprinkler valve to indicate a fault situation if the main valve is to be shut for any reason. The client has now asked for the intruder alarm to be linked to this valve also in order to fulfill these requirements , both parties need a clean...
  13. B

    Diehl 4300 16 amp limit?

    Has anybody used the Diehl 4300s and confirm wether or not it is limited @ 16amps? A customer of mine would like me to fit a system he has already purchased - 18 x 250w Sharp mono's with this inverter, he is adamant on installing all the panels so will be 4.5kWp. Now as far as I can see from the...
  14. M

    3680W DNO Limit affecting System Choice

    Having room for 16 south facing panels I got hung up on efficiencies and started to look at 16 of the Sanyo HIT-N240SE10 panel making a 3.84KW system. I was recommended for similar money to go for 17 of the HIT-N235SE10 panel as this would be 3.95KW. Yet from a configuration point of view 16...
  15. M

    limit output of 4000tl?

    My DNO say that the output of a sb4000tl can have its current limit set to 16A, does anyone know about this and how to go about it, i have an install that falls between 16 and 17 amps Regards Malcoa
  16. G

    VAT - Is there an upper limit?

    Got to get a quote in for a domestic 10kW system and struggling to see whether this is still billed at 5%. I know there is a theory that 4kW is demed to be the upper limit on a domestic property, but does anyone know where the line is drawn? Might have to give HMRC a call on this on as there is...
  17. 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...
  18. L

    has to be a limit when u walk away

    Is it me or are customers asking for a lot more for a cheaper price. took an hour away from my family this afternoon to quote for a job, The guy wants his Airing cupboard wiring tidying up, a 8 way ccu change with tails and bonding for under £250 Also an old 6mm shower cable re routing from...
  19. L

    immersion heater high limit stat probs

    seem to be getting a lot of problems with the high limit stats on new immersion heaters tripping out have tried several makes they all seem to have the same problem is anyone else having the problem or found an answer :angry_smile:
  20. UKMeterman

    LV over volts amd realistic upper voltage limit from the DNO?

    Hi, I have just moved into a house where the voltage measured on my Megger PDA1 and a RMS volt meter is often 255V or more and has sometimes reached 261 overnight. The PDA1 had also reported a large number of HF noise events of about 2volts for several mins at a time. There have been a couple of...

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