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  1. S

    still need answer please

    Am i right in thinking a 600 KVA 3 phase supply is approx 1400 amps per phase. Read more: http://www.electriciansforums.net/electrical-forum-general-electrical-forum/67069-kva.html#ixzz2BMgYxgmu
  2. D

    help with questions i cant answer

    well hear i am asking for your help again i really don't know what i would do with out this site and the people who answer the questions i ask so thanks for all you help - Which of the following is classed as 'Minor Work'? a) Adding extra lighting points to an existing circuit b) Installing...
  3. T

    sorry if wrong section- help with Q on inductive reactance - revision homework

    hi all, can someone if the following answer is correct. would as teacher but 2 days till class. a coil of inductance of 0.2H is connected across a 230V 50Hz supply. What will be the current flowing in the circuit, if we assume that there is no resistance? XL= 2pie fL XL= 2pie * 50 * 0.2 =...
  4. M

    If anyone could give me their answer on this question, and how they got there pls

    the question i am struggling with is this, im new to the calculating of things and am not sure where to start. A two core cable supplies two loads from a 230v supply, the first load is 70m from the supply and takes a current of 40A, the second load is 100m from the supply and takes 20A. find...
  5. J

    High stakes on this answer

    Hi all in the forum A tea time discussion has created a non decisive answer, and there is a cup of tea swinging on the solution. When testing an rcd, should the protective bonding conductors be disconnected? We have agreed to accept the general consensus of this forum as our decisive answer...
  6. lurch

    Memera 2000 RCBO definitive answer

    Hi I have seen a couple of posts on this subject but they go back a bit and dont appear to have a definitive answer. I have a MEM Memera 2000 CU, where I need to provide RCBO protection to the lighting circuit to cover some additions I have made in the bathroom. There is already a Eaton 16A...
  7. ian.settle1

    Can someone answer this?

    On my way home every night I pass a house in the countryside which has a wind turbine in the garden which stands approx 30 feet high, I was just wondering if anyone could tell me if this wind turbine's output is AC or DC?
  8. P

    earth fault loop three methods?

    when confirming auto disconnect of the supply it is necessary to determine the external earth fault loop impendance of the system. What three methods can this be achieved? So the external earth what loop impendance is the supply companies end is that right?
  9. J

    need answer

    If a transformer has 50 turns in the primary winding and 10 turns in the secondary winding, what is the reflective resistance if the secondary load resistance is 250 ?
  10. J

    Answer this question

    Yesterday, I faced an interview. The interviewer asked the question.... Que. The parallel combination of a 470 resistor and a 1.5 k resistor is in series with the parallel combination of five 1 k resistors. The source voltage is 50 V. What will be the percentage of the load current through...
  11. B

    Can we get an Official answer on this,,Inspection,Testing and Certification and 2391

    Can we get a firm answer and decision on this beacause as I read through this forum I become more and more confused,,,on all the courses I have just done which includes Part P and 2391 Inspection,Test and Certification,,,we were told that you must be registered with one of the schemes to...
  12. i=p/u

    voltage drop issue to be or not to be

    i have a heating ciruit to install soon and the distance from time clock to boiler is maybe 30-40M would there be a voltage drop issue with .75 flex. does anyone know the mv/A/m for .75
  13. M

    Another Voltimum Expert Gets it Wrong!

    I've become anesthetised to questioners on Voltimum seeking a black or white answer being given a grey vague answer because the Expert is sat more firmly on the fence than a Liberal Demorcrat MP. However, sometimes they just get it wrong, today's Q&A of the day on Voltimum 'answered' (NOT) by...
  14. ringer

    Prospective Fault Current

    I was under the impression that PFC is the greater of either the PEFC or the PSSC. Now look at this article (endorsed by the NIC) on Voltimum.... Voltimum Q&A I am assuming that the guy's tester is indicating over-range on the PSSC measurement. Apart from the fact that the way it is written...
  15. Top Cat

    PAT testing, fixed, portable. The definitive answer!

    I think to stop all confusion between fixed and non fixed appliance testing we need to re name the procedure. My suggestion is:- Frequent Allencompassing Rigorous Testing F.A.R.T We could all then get a C& G in FARTING! :angel_smile:
  16. T

    Sitting 2392 have practice question cant get the right answer help

    Hi guys have a Question on a practice paper and cant get the answer to the same as paper what am i missing any help would be great thanks in advance. A radial socket outlet is supplied in 2.5mm cable and is 20 m long the Ze of the istallation is 0.43ohms and the resistivity of the cable is...
  17. W

    Can anyone answer this??

    Sorry chaps, but I posted on another thread and it seems to be getting overlooked - could really do with some help sorting this out: http://www.electriciansforums.net/inspection-testing-certification-electrical-installations/29798-new-eicr-editable-pdf-certs-16.html
  18. L

    College work ?

    Hey Guys im a 3rd year apprentice struggling with my college work anyone got a clue in this question HELP ME! please A coil of resistance 4ohms is connected across a shunt of resistance 0.005ohms if the current in the main circuit is 50a what is the current of the coil ? :sick:
  19. S

    question to answer

    im changing a consumer unit and its on a tncs system. can i still use 30ma rcds as normal
  20. I

    Anyone from city & guilds... Can you answer this, ammendment related.

    Hi all, i am currently studying in west london for the 2391.10, i was originally posted to have my exam in december but due to mix ups we wernt put forward and now have our date of 9th feb. As the amendment comes into force on 31st jan will our exam be marked incorporating the amendment or...

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