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secondary

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  1. R

    Amtech 3 phase tx load

    Just trying to work out a cable and fuse size for a 3kva 415/240v transformer with a 2kW load on it, using Amtech single cable, there are no settings for showing a transformer on the load side, is it possible to calc a transformer load on Amtech. If I use a motor as the load it chooses fuses...
  2. D

    Secondary ccu

    Hi just fitting a secondary ccu to some kennels ad was just think that the secondary board main switch is 60 amps and the breaker supplying from the main board is 40 amp so if there was a problem the main board breaker would trip before the kennel one how do I combat this. New to the game guys...
  3. F

    Secondary Switchboard for kitchen from Primary Switchboard

    I am currently working on my kitchen and I am centralising the switches for all appliances (Fridge, 2 Ovens, Induction Hob, Hood, Dishwasher, Washing Machine, boiler and counter sockets) on a secondary switchboard. In order to do that I am running a 6mm multi-thread cable from the main...
  4. S

    Solar Thermal secondary return pump Fluropro

    Hi I have been installing a Solar Thermal system (with a plumber friend) with a Glow-Worm Fluropro controller, and the system has a secondary return pump on it. I can't find any live output for the pump. I could just put the pump on a plug-in timer, but in the manual it states that the system...
  5. R

    Testing Transformers

    Hi, Could anyone give me some advice on methods of testing 12v transformers if at all possible? Why I ask is because been to a customers because one of the under cabinet 12v lights wasn't working. First I tried changing the lamp which didn't work but worked in another fitting. Then just assumed...
  6. M

    Weird Voltage to Earth Readings

    I will refer a weird voltage readings on my mate's workplace.. A newly installed transformer delta-wye, 440/380V will supply a TT power system. He measured 380V per phase on the secondary and 220V L-N.. But when he measured L3 to earth he measured 0V. L1 and L2 to earth is 380V and Neutral to...
  7. M

    110v transformers

    again would sincerely appreciate a bitof help have a client who wants a mix of stuff doing all in small numbers not really my normal work but have splashed out on a seward 250 to accomadate him and having a few issues on a coulpe of things namely 110 v transformers could some one please...
  8. N

    secondary consumer unit and bonding

    hi all I have been asked to change a consumer unit in a house. Most of the house is covered by a new consumer unit (17th ed.) and all the bonding to gas and water is covered by this. The consumer unit i am changing covers the electrics in an old extension that consists of 2 bedrooms and a...
  9. E

    Secondary Consumer unit.

    Hi all, I need to run a supply to a summer house, there's no room in fuse board for another circuit. I was going to split the main tails with 100A DP service connection box and put in small 1 way C/U, run the cable in swa then add another 2 way C/U at summer house. Is this the best way or is...
  10. H

    24 volt, 50 hertz, 81 watt pump

    I've got a very well made 24 volt, 50 hertz, 81 watt pump, however I do NOT have a transformer/converter. I'm from down-under, so we run on between 220 to 250 volts. Is there a nifty trick one can do to get this thing running on 240 volts? Can I put a different transformer in-line with a...
  11. S

    Secondary CU

    Hi guys, this is my first post here (though I've been lurking around and reading for a while) and I have a question. A customer has has a house that used to be two flats. The main CU (downstairs) is fairly new (about 6 years old, I'm told) but I don't think to 17th edition as only a few of the...
  12. Y

    Why VT Secondary Yellow phase is earthed?

    Hi all, I have a scheme in which the Y-Y VT secondary yellow phase is earthed. and is fed to a 2watt meter energy meter. can you explain why this is done so. regards, kannan
  13. V

    240v - 12v downlighter transformerkeeps blowing.

    Hi, I have replaced this twice and they have both blown within a few minutes of fitting. There are 3 lights on the circuit each with their own transformer and a dimmer switch. This installation has been up for 10 years with no problems till now, the other 2 lights are fine. 2 transformers...
  14. L

    pv installation problem - please help!

    hi everyone, i'm doing a photovoltaic installation this week and i've got a bit of an awkward problem to get around... the pv array is going on the roof of a secondary building that is completely separate from the main house. the problem is that the secondary building has its own supply so if i...
  15. M

    what size mcb on the secondary of a 7.5kva transformer

    I am installing a 7.5kva transformer 240v / 110v single phase . The primary side of the transformer is fed from a 32A type D mcb and wired in 3 core 10mm swa from a board next to the transformer . The secondary side is wired in 10mm 3 core swa and feeds a 12 way enclosure next to the...
  16. T

    Control panel problems

    I am refurbing an old BMS control panel the panel is about 15 years old and had Satchwell controls in, I am now fitting Trend I have been told that the controls/ panel never really worked. I have got half way through the refurb and I have a problem with the 0-10 volt signals, they seem to do...
  17. S

    Through Fault Current

    I want to understand the concept for through faults in case of transformers. For example, there is an external fault on secondary side of a generator step up transformer, so when it is said that all through current will pass through the transformer, does it mean that current is now flowing in...
  18. M

    secondary DB !!!

    My pal has asked for a power supply for lights and sockets in his garage and so can I just ask if the following would be ok ??? 32A MCB at the main CU to protect garage feed. 2.5mm SWA run of 30m to the garage Secondary CU in garage with 1 20A radial for 3 socket outlets and 1 6a lighting...
  19. M

    ZS on secondary circuits

    Afternoon all, Just a quick one, When calculating the Zs on a circuit fed from a secondary distribution unit do you add the R1+R2 of both the circuit under test and the cable feeding the second distribution unit to the Ze or is it just the R1R2 of the test circuit to the Ze ??
  20. C

    RCD Testing by Secondary Injector

    I have a number of RCCBs and ELRs installed in my installation which have never been tested aside from pushing the TEST button. I would lke to carry out a more comprehensive test with respect to the pickup and timing delays. In absence of a conventional RCD tester, could I just use a normal...

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