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  1. buzzlightyear

    heat source pumps wiring

    any body point me to the right direction on heat pumps wiring ,or done any or pdf how the wiring done on them .
  2. I

    Can anyone give me the answer and source for this question on current carrying capacity

    Hello I just need to know the correct order and a source which shows me that it is that order please When calculating the current carrying capacity Is the correct order Ib ≤ In ≤ It ≤ Iz Or Ib ≤ In ≤ Iz ≤ It Niceone
  3. JasonB

    How to source Sub Contract Work

    Hi all, Is there companies or people out there that can help source sub contract work as im not sure where to start. I know you get recruitment companies to help you getting PAYE work places but i really want to get some sub contract work but didnt know if there is somewhere you can get a heads...
  4. L

    UK Wired doorbell power source

    Hello, I would liked to install a Byron wired doorbell with built in chime and 8v transformer. I'm struggling to get power source. I have a light close to the front door. Would it be ok to use this the light cable as a power source? I would have to put some kind of switch and have it...
  5. D

    Decent source of online 18th edition training?

    Hello all Planning to do the 18th edition online. I could just batter loads of old papers on the head and then have an attempt ( I will do loads of old papers anyway as practice). But, it''s been an age since I did my 17th and I think I would be better off learning how I actually...
  6. D

    Power source to multiple wafer lights then to switch?

    Hi all, I'm wondering if someone can answer this question concerning a wiring scenario. I recently saw on a youtube video - a guy create a scheme where the power source first went into a light then went to the light switch. Is this safe for series of 6 wafer lights (6 in.) 75W 1140 lumens...
  7. G

    VFD -under volt at source fault

    So earlier this year I obtained a large machine with a couple of 3 phase motors in it, and the rest single phase. I bought a VFD, correctly wired it up, and while the machine ran with some functions, it also reported "undervolt at source" I had bought a VFD with a maximum output of 380 volts...
  8. aidanmcg33

    One external source split into multiple zones

    Our house has one external feed going outside to power lights. We've recently renovated our garden/drive etc and now there are three different zones where we would like to have lights and control when they are on/off. With one source going outside and one switch, I was wondering if there is...
  9. J

    2x4.8kw hot water with 1x4.8kw source

    I have a 4.8kw solar diverter with 2 x 4.8kw hot water systems. Is there a switch that will only heat one hot water system at a time and switch over? So basically, 1 x 4.8kw line that goes to two hot water systems that only heats one at a time and switches over to the next one when one is done...
  10. T

    The principle of the pulse source

    I have a question about a pulse source for a mobile phone charger. I read on the Wiki that the power supply is first rectified, then oscillated to a higher frequency, converted to a small transformer and re-rectified and stabilized with feedback towards the multivibrator. I have a question as to...
  11. timhoward

    Stable power source - UPS?

    Would a small UPS, running on batteries, be a suitably stable 230v 50hz supply while I do some tinkering with the loop calibration settings on an old Robin 1610? Any better idea's that don't cost a lot? This is entirely a hobby project and not worth investing in lots of equipment for,. My copy...
  12. F

    Heating system is via an air source heat pump.

    We have just completed a self build, and heating system is Air Source Heat Pump, unvented HW cylinder, Buffet Tank, all Vaillant equipment. The heating firm have ceased trading before the system has been completed and fully commissioned. Ground floor is UFH with 6 zones controlled by Heatmiser...
  13. U

    Combined Charging Source

    Is it possible to charge my battery bank from one combined source coming from solar panels (via Victron Smart Solar Charge Controller), Victron battery charger (via shore power when connected) and an alternator (via Victron Orion-TR Smart DC-DC)? All sources lead to one common busbar which then...
  14. Alan-N

    Contactum DP RCBO source

    Anyone aware of a supplier for Contactum 40A Type A B Curve 1P+N Compact RCBO's (CCPBR06401AB) Google has let me down. I have checked all the usual suspects (TLC, Screwfix, Toolstation, Rexel, Yess, CEF etc), and nobody lists a DP only SP
  15. A

    Earth leakage from unknown source.

    I'm new to this but stuck with an issue, so I'm looking for some help wherever possible. I have just completed a rewire, which I have a potential difference of 60v between MET and disconnected mains earth. It's an RCBO board with type 2 SPD. I have fully tested the installation and have greater...
  16. N

    Automatic Transfer Switch Back Up Source

    When an automatic transfer switch operates (solar has stopped generating) does it matter if the the secondary power source is not present (until economy 7 kicks in) at the time of switching?
  17. Y

    can't find the source of a burning smell

    Hi, I've had a burning smell in my apartment for two months now and 3 electricians who have come have not been able to diagnose the problem. My apartment is in the Bronx, NY. I bought it 1 and 1/2 years ago. I has a fuse box. Last summer, my first summer there, no issues. I ran my AC and...
  18. acursi15

    Wiring help for multiple lights and one power source.

    I've been having issues with my dining room lights flickering and light switches working intermittently. After taking off the switch covers, I didn't need to be an electrician to see stuff was wrong. There were exposed wires, red wires attached to black wires, black to white, and so on. I've...
  19. B

    1950s underfloor heating brought into reuse with air source heat pump

    My mother moved into her three bed home in 1960 and it had underfloor heating in the living room. I remember we used it when I was growing up in the 70s but it hasn't been used for probably 30 years. Electric storage heaters were installed to take advantage of the old off-peak electric tariff...
  20. London renter

    Adding power source to outdoor basement flat shed

    I have a dark dingy old Victorian coal storage area in the basement, just below street level, accessed via a gate and stairs to the basement flat. The sheds used to store coal but then became a bin storage area but the council won’t collect bins from down there anymore, so it’s just been lying...

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