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explain

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  1. E

    can someone pease explain this UFH system please

    ok please don't take the p***, i've never wired up any central heating systems outside of a training environment, and have only done it twice! On a job i'm doing they have just decided to go for UFH last minute, and i have been given a wiring diagram which is below and asked get the wires in...
  2. L

    Lighting fault which I cant explain!

    Fellas Had a call out to a tripping MCB, 6A Starbreaker, the kitchen lights trip the breaker intermit idly. The lighting arrangement is 5 X 35w LV Halogens on a wire rail, voltage is stepped down via one 210VA transformer, I tested the cable from the switch (looped N) to the transformer L-N...
  3. S

    3 phase

    Hello! I have joined up on here to hopefully get some useful advice. I'll start off with a small introduction; I am opening a restaurant, it is an empty premises, completely bare unit... but the electrics are a mess (in my eyes!). There is a list of niggly things to look at i.e. light switch...
  4. Dean Williams

    can someone please explain?

    Hi folks Think i'm having an off day today, but could someone please explain the science behind the reason you would install a larger earth cable to a jacuzzi pump. I know its something to do with fault current, or leakage to earth through water under fault conditions where the fault current...
  5. Q

    Explain to me Electromagnetic Induction, EMF to be exact...

    Hello, I am struggling to understand how electricity is generated in an AC generator... I know that there is a coil of wire and a magnet, and both of them have their own magnetic fields and as the magnet moves into the coil's magnetic field, it causes electrons to move in that coil. Well if that...
  6. S

    Customer Guidance

    Hello all, Can anyone recommend any literature to give to domestic customers to help explain the problems that can be encountered when upgrading consumer units/fuseboards? I'd like to give something to my customers in black and white in advance if they are not interested in paying for a...
  7. M

    Could somebody explain please

    Went to some family friends earlier who are having nuisance rcd tripping problems. They have just about every probable cause going - rusty freezer in a garage fed underground in non swa, underground feed to a shed in non swa, enough fridges, freezers and washing machines to put Currys to shame...
  8. R

    Can someone please explain this

    Can someone please explain clearly, concisely and briefly what power factor is I've tried looking at various sites and they go way too far in depth and I get lost. I just want to know in Laymans terms what it is And I would also like to know the difference between VA and Watts, again clearly...
  9. L

    Can anybody take 5 mins / few words to explain briefly whats going on...r.e JIB ect..

    Hi Lads Can anybody take 5 mins / few words to explain briefly whats going on...r.e JIB ect.. I'm not nieve or ignorant but up on the North Wales coast where self employed sparks are 10 a penny nobody is talking about it, and even though i'm reasonably educated I just don't really understand...
  10. 0

    Explain why V1 and V2 do not add up to Vs.

    Could someone please help with with an answer to that question? I'm stuck on it. :( If you require some more details, please ask. Thanks. :D
  11. E

    Can some one explain how it works

    Hi all, Ive been given an oppurtunity to meet a company that does all sorts of building works, from schools to local authority and businesses... Ive never had to deal with anyone like this in the past so i feel like a little fish swimming upto a big fish The thing i would like to know is...
  12. E

    Split Circuits

    Hi, I need seem advice. This may be quite simple but I would appreciate it if somebody can explain it to me. The electricians onsite only mumble when I ask them, to lazy to explain it to me. We are installing lighting circuits in a hotel along the corridors. The are uppers and downers the length...
  13. W

    could someone please explain why NVQ3 2355 is needed

    Good day, I currently have my 2330 Level 2 certificate and Im wanting to qualify as an electrician. I have worked on construction, domestic and commercial, for 2 years as and Improver and Im currently working in Building Services as an Electrical maintenance engineer and this where I will...
  14. D

    Please Explain: Symmetrical fault current

    Im doing my 2391 course and it was quickly mentioned about symmetrical fault current when talking about PFC testing. It was just mentioned and not explained so can anyone explain what this means. My first thought is that 3 phases shorted together would cancel out and leave 0 volts?? But...
  15. S

    2 Radials into a 32A B type breaker and other wonders !!!

    Hi all, Hope you guys are all enjoying the nice weather and not working inside some dark small cupboard like I was today !!!! Anyway, here is the scenario. Neighbour comes over this morning and says her fuse for downstairs has tripped and cannot be re-set. I go and take a quick look and test and...
  16. F

    please explain harmonics

    reading forumn tonight been along day few drinks cant be bothered digging books out can someone please re educate me on harmonics:mad:
  17. P

    can someone explain how to become a spark in 5 days

    just how is this possible what is the course outline i just cant get my head round it all that work in 5 days is this for real and has anyone on hear done this ??? im not intrested in doing it as im going to propper college for 3 years plus 2391 after it etc im just curious how this can be done
  18. S

    can someone please explain this to me, as simple a possible so i can explain

    i am very new to this, and i have been asked to explain a few times, how the power generated fro the pv panels is used for power around the house, i.e how does it know to use the power from the pv panel and stop using power from the electricity supplier,
  19. M

    Can someone help explain continuity testing

    Hi I am new to electrical work and I have invested in a multimeter to test components of boards. My meter has a continuity test function. I have read up on it but some of it still doesnt make sense to me. 1. When I put my negative probe to a ground point and then touch a pin or hole on the...
  20. S

    please explain as many as possible

    i have just been handed a sample of a handover package which i need to do to get mcs approved, but can people explain the one i list below, to make sure i have done it. what is and where can i find a: Hand over certificate Pv system test sheet emergency shutdown procedure onsite...

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