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  1. S

    New assumed Current Demand of Installation

    OMG!! can somebody please point me in the right direction because i am sure that i am looking in the wrong section of the REGS book... here is my question... Explain with reasons the New Assumed Current Demand of the Installation? My answer is this... For economic and reliable design, the...
  2. N

    discrepancy between total on generation meter and that on Tigo monitoring

    a friend is concerned because the total generated value for her panels given on the Tigo website (optimisers were used as there are shading issues) is considerably higher than that shown on her ge. meter. The system was commissioned on 14th Jan and reading on gen meter is ~ 2/3 of the total...
  3. L

    Total Power Outage, but nothing has tripped.

    Hi. My next door neighbour's power is totally out. We've checked and nothing has tripped, including the RCD. We've tried turning off all accessible sockets, then switching off the mains and the RCD, then turning them on again and trying things at random, but this hasn't helped. Any ideas?
  4. B

    RCBO noise

    Hello All. I have recently rewired a house, and fitted a TD-Line CU (main switch and all RCBO's). All has been fine until now, 1x 6a RCBO for the kitchen and TV room lights has started making a sort of buzzing/humming noise. I haven't heard it myself but the client says that it isn't very...
  5. K

    3 phase sunbed

    Hi all Can you please help me with the below: i have 5 sunbeds thats 13KW per bed so 65KW in total (all 3 phase) + lighting, sockets etc all approx 3KW(SINGLE PHASE) Total of 68KW I need help with calculating total maximum power in kVA that i need for the above I tried to calculate it...
  6. R

    VAT on Solar System

    Forgive me everyone. New to this. How is VAT charged on A Solar PV system? If the system had 20% VAT put on by the supplier that sold to the installer... Where is the 5% calculated from by the installer when billing the client? Cheers
  7. G

    how to work out total resistance of a parallel circuit

    hi i am new to learning about electrics i have just started an electricians course and have a question. The question is : Two heating elements of 70 ohms & 30 ohms are connected in parallel the total resistance of this circuit would be...... i have tryed all differnt web sites i have worked it...
  8. 1

    Upgrading existing installation

    My MCS assessment site was 10x235w Conergy Mono panels with a sunny boy 2500HF on the roof of a south facing lean to extension. I havent yet notified the installation yet as I only got my MCS 2 weeks ago and the customer wants me to upgrade it to maximum, by installing panels on the upper roof...
  9. K

    A total culinary disaster!

    Can any lads from Lancashire can tell me what’s happened to Holland’s of Baxenden. I wanted to place my usual order of 3 cases of steak and kidney puddings but they seem to have vanished off the face of the earth. I can’t get a decent pudding in Nottingham for love nor money! I know the...
  10. B

    a total newbie, can you have a mix of 2 port motorised valves? a MOMO on one and

    Just found this great site, saved me a fortune!! Plumber was called to check heating problem, rads getting warm when HW on!! His solution, replace the drayton valve and actuator, drain system etc. I was not convinced so did a bit of reading, got to part, check spring on drayton, did that...
  11. C

    adding a light switch (4switch's in total)

    if you had a intermediate switch set up and decided to add another switch does this new switch have to be 4 way ? cheers for the advice
  12. B

    Pricing partial rewire( is it not to much)

    Hi! I am pricing 3 bed flat in a block. Some circuits are existing will be not replaced (clients wish), kitchen circuits are new.Cables to be run in floor, wall, ceiling dwellings, everything is in concrete and bricks. Price is just for labour, no materials. Am I not charging to much?!?! Job is...
  13. V

    total resistance of a parallel circuit

    Hi, Question- Why is the total resistance of a parallel circuit always lower than the lowest resistor? I feel i have read lots on parallel circuits and googled it many times but still cant figure it out. The four answers i have to use are: A=The current is the same across each resistor B=the...
  14. F

    Total costs to get mcs accreditted and ready to install?

    I'm looking to get into installing pv and have been on a course last year. I remember it seemed like it was going to cost a fortune to start up. I would like to know the exact costs for everything to get me passed my first install and mcs accreditted. Not including the installation costs of the...
  15. Z

    UPS Battery Run Time

    I need some calculation on based of following findings: UPS rating = 1200 Watt Battery Rating = 1300 Ah Total Connected Load = 1000VA Operating Voltage = 240 V Can anyone please calculate for how long battery will provide power to the load ( i mean run time) ? Please show full...
  16. A

    9Kw pool heater, earth rod, seasonal drought + total tiling

    My neighbour had a 9Kw inline (in-pipe) water heater fitted - cables look well installed, with trip protection as requested by the heater installers. On connection it pulled the house trip. They suggested (rightly or wrongly) to install a separate supply before the house distribution panel -...
  17. C

    Not just a Noob - A Total noob

    Hi all. Brand new to all of this so please go easy. Im 31 and spent 10 years as a Police officer but left due to the way the job was going. I never listened to my old man before he died about getting a trade behind me and now I find myself wanting to learn. I have always been interested...
  18. L

    Total Trade Services - Wales

    Just wondering if anyone has heard of total trade services? anyone worked for them or with them? good or bad experience? cheers
  19. W

    3 phase upgrade

    hi guys , i have to install new 3 phase cable to mushroom sheds and am not full sure off the size of cable i need. i have worked it out that i need 5 by 25mm swa. the cable run is 70 meters long and will be buried in the ground and will be ran with 5 other cables of the same size as there are...
  20. S

    can someone please confirm my working out, just for piece of mind.

    please can someone confirm my working out of a annual return, as this is my first quote and just need confirmation that i have done it right. the system is a 22 panel 180W bp mono system and i am assuming the customer will be exporting 50% 22 panels x 180W =3960W or 3.96kW this will...

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