understand | Page 4

understand

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  1. M

    Student doesn't understand disconnect times

    Why do circuits over 32A have a 5s disconnect time yet those 32A or less have a .4s disconnect time? I have read the relevant regs but do not understand why and cannot find the answer in my books
  2. B

    Can anyone help me to understand ?

    Hi Guys, Had a PV system installed last week, 16 x 250w Sanyo panels wired as 2 strings of 8 on the roof - then connected in parallel in the loft and ran as a single input into the inverter (SMA SB4000TL) - apparently it is more efficient that way. Can someone explain to me (in simple terms...
  3. P

    Theres a possibility of electrocution understand?

    Don't know if this has been posted here before but it had me in stitches:D YouTube - ‪young frankenstein part 5‬‏
  4. P

    partr p testing and documentation

    Hi Guys, I am changing a cu with a full test,the test certs say r1 plus r2 and r2,as i understand it you do a full r1 and r2 on all circuits,and also r2 on all circuits.also the r2 test,i understand its a continuity test on the cpc to a seperate earth to furthest point in circuit.Have i got...
  5. D

    Can some one please help me understand what iv singed myself onto? please :( ?

    Hi, I had joined the access 2 trade professional electrician course just before they went bust ; and now thanks to barleys i am with OLCI (of which iv only heard bad things about which is worrying) so i should hopefully eventually get : EAL Applicable Building Regulations for...
  6. S

    Helping computer programs to help understand wiring systems etc etc??

    Hi, ive been in and out of electrical for a while and have never quite grasped alot of wiring systems, i.e heating systems. Alot of the time im on the job im sitting in the dark as to whats going on which im fed up with. Ive discovered the internet and the computer a very quick and powerful tool...
  7. J

    schemes

    need to join a competent person scheme but dnt kno who best to join? also is just 2391 ok or do i need 2392?
  8. P

    Please help me understand cable markings

    I've moved into an old condo a month ago and have made alot of changes to the electricity but now find out I might be in danger using it. I need cables for a load of both 20Amp and 40Amp, the circuit breakers have already been replaced. How can I see if the cables being used in my room are...
  9. C

    3 phase heater help needed

    There is a 12KW heater installed being controlled by a three phase thyristor control. There are 6 x 2kw heating elements and i am stuggling to understand the operation. There are two elements connected to each phase but then they are then all linked to a common bar on the opposite side of the...
  10. M

    commercial db numbering

    How do you number a DB ? is there a "universal" way to do it? ie 1L1L2L3 2L1L2L3 ....... running down the db or 1L1LL2L3 2 L1L2L3 1being left and 2 being on the right Odds down the left and evens down the right what about odds on the left up from the main switch there appears to be...
  11. W

    Fault Finding - Dead

    I apologise in advance if this has been posted many times by others :D Im after some help on fault finding for my AM2 exam. Apparently you only get an continuity tester and insulation resistance. Would just like to know some information on testing different circuits and how to locate the...
  12. W

    i dont understand...

    hi, ive been reading through this forum for a couple of weeks now, but i still cant get my head round a few things. ive seen some people saying just do the job and issue the cert etc. but who do u issue the cert to and how is this possible if your not registered with any1? im just wondering...
  13. P

    Shower tripping

    Hello I have just installed a new fuse board and when the shower runs the MCB trips within 20-30 seconds the ins rest is 1000+Mohms the ze is 0.54 ohms the shower is 9.5kw I know I nees a 40amp breaker but what I cant understand is why it was ok on a 30amp wired fuse before and it shouldnt...
  14. C

    jib card

    Hi All hope you can help with a little problem i have i have just applied for a new job put in my cv and they have e mailed me back saying that i need an Approved jib card.I was under the idea that if i had 2391 17th ed and was qualified to C Cert i didnt require a card. If i do need a card...
  15. M

    Basic Testing Help?

    Hi all, I got my C+G exam 1 exam tomorow and exam 2 a week tomorow. I have been working on circuits since September but I'm finding testing a little hard to get my head around? Can somebody explain in simpleton words the basic way to test etc; CPC Continuity Insulation Resistance Plus a...
  16. W

    I still don't understand

    I am positive that hundreds of you can help me to understand better... I would like to take a Part P course (EAL Domestic Installation) 5 days course... + 17th edition. What kind of job will I be able to do with those 2 courses? I do not plan to work for myself at the beginning...so Will I be...

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