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  1. B

    Maximum disconnection times

    Hi does anyone know max disconnection times on tn-s system for: 16A radial 6A lights 32A distribution Cheers
  2. Meg464

    Unsure of exactly what the question is asking and how to answer it!

    Hello, I'm a little stuck on assignment 303, id appreciate a little shove in the right direction, I'm not looking to get answers, just need to pick your brains to get on the right thought track as the questions are worded oddly on some of them and I think I'm over complicating it!! 7b) Likely...
  3. P

    What is the difference between Electric Charge and Electric Current

    I understand that electric current is the flow of charge or electrons. would I be right in saying that electric charge is the ability of matter to experience force, such as attract and repulsion.
  4. N

    Introduction & Advice wanted

    Good afternoon, I've currently got a metal and plastic recycling facility, we normally just take in plastics but are licensed for metals. We've recently recieved some transformers to be recycled, from what I know, 500KVA Dry transformers, they weigh about 1500kg each and I've got 3 with all...
    • Nicole938
    • Thread
    • advice answer copper introduction question transformers wanted
    • Replies: 3
    • Forum: The Welcome Forum
  5. W

    Worried Student

    Hi, I am currently doing a Level 3 City and Guilds course in Electrical Installation, I have a written exam next week and really need some help, if I fail I will lose my job, my past exams have all been multiple choice questions. I would be most grateful for any help or advice. Thank you
  6. J

    Do you need an earth rod for an outbuilding?

    Do i need an earth rod if i am running a supply to a shed/outbuilding ? The incoming supply to the house is tnc-s
  7. D

    Too many calls!

    I was wandering what people do when they're busy as hell and have phone call after phone call from potential customers. Do you stop what your doing, answer every call possible and arrange visits for quotes until all your evenings are booked up for the next few weeks? not to mention all the time...
  8. S

    Fuse rating

    Hello I have a question , when looking at a cartridge fuse that say's , 32A (32SB3) , and at the side it says 550V AC 80kA ( BS88.2 ) , can this be used as a 32A on 240V supply ! . SpotBot
  9. N

    17th edition exam

    About to take my 17th edition exam and when I did the 16th edition is was on old fashioned paper (who remembers that). Am I correct in assuming that within the 2 hours I can go back and forth to any questions I have answered to check them and if necessary change the answer. Also do I get the...
    • Nicebloke
    • Thread
    • 17th edition answer answers because edition exam questions
    • Replies: 13
    • Forum: UK Electrical Forum
  10. R

    Rcd protection on adding 1 light

    Just a quick one. I have added an LED floodlight off an existing light on an outside wall and the circuit is not rcd protected. Do I need to fit an rcbo on the circuit or not. The cable is clipped direct through a loft space.
    • rwood1981
    • Thread
    • adding answer circuit direct light protection quick rcd
    • Replies: 2
    • Forum: UK Electrical Forum
  11. R

    BS7671 Amendment Question (Regarding Shower Rooms & Tests)

    Hi all, long time no see! So I have this question that I need to answer for an assignment but there is an issue. I have a copy of the BS7671 Wiring Regs Amendment 3 (which has amendment 1 & 2 removed from the introduction). Question 1 asks : Which zone no longer applies to a shower room? The...
  12. G

    Pv on rcd

    Hi guys doing a solar iboost as a subby the other day and noticed that the Pv supply had been connected to a shared RCD, situation was TT supply feeding 2 dbs at the origin each with a 30mA main switch RCD. I was always under the impression that this was incorrect but read through the Dti guide...
  13. W

    The simplest answer wins

    Hello there, I have two questions. If someone would answer them for me in just one sentense would be great. Why do electric cables very in width? How does this vary resistance? Cheers and thanks in advance
  14. S

    City and Guilds Assigment Help

    Hi everyone, I need serious help here I know theres a post on this before bit everyones answers seem wrong. I need someone who seriously knows what there on about, here is the question Propriety Fixings of the PVC Conduit I need a solid answer for this as I have college tomorrow thanks
  15. 8

    MFT 1720 up for sale

    Hi guys. As a regular user of this forum, I just though I would share the fact I have put my MFT 1720 on ebay, the terms on ebay are as shown, but however will consider ending auction for any sensible quick sale offers...
  16. P

    for cable jointer ,help me to answer this pls

    Hi just wanna ask some question pls answer this if u have an idea Here's my question for cable jointer 1, when one end of the cables metallic is not to be grounded what would be the risk and what are the precaution required? 2, if a dicision is made not to ground thr metallic screen...
  17. G

    trying to answer a 2394-5 testing question help please

    Q The earth fault loop impedance for three of the final circuits were L1.1 0.61 ohms L1.2 0.42 ohms L2.3 0.21 ohms determine, showing all calculations, whether these circuits comply with BS7671 the scenario I have stats measured Ze 0.08 all at 20c do I have to do something with 80% 0.08...
  18. A

    series and parallel combinations

    Hi all I am carrying out my assignment and a little stuck on this i have to work out the Total inductance and total capacitance now I'm aware of the formulas for series and parallel inductors and capacitors but as you can see from the picture i have a series/parallel combination and I'm...
    • andyc425
    • Thread
    • answer parallel right series trainee
    • Replies: 14
    • Forum: UK Electrical Forum
  19. S

    Expected r1 r2 value when circuit 16.5m long

    Hi Guys stuck: A ring final circuit wired in 2.5/1.5 Resis: per m 7.41 and 12.1 what is the expected value of (r2+R2) the circuit is 16.5m long
    • smthdeedog48
    • Thread
    • answer circuit long question value working yourself
    • Replies: 48
    • Forum: UK Electrical Forum
  20. B

    2394 Multi Choice Mock Papers

    Hi Guys Sitting my multiply choice exam next tuesday. Any chance of any past papers or recommended sites? Any infomation would be much appreciated Many Thanks Stu

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