polarity | Page 3

polarity

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  1. D

    2394/5 tomorrow

    Hi guys got my 2394/5 written exams over the next two nights, wish me luck!
  2. Resu

    European Sockets

    Hi all, my mum runs a B&B and has a lot of issues with European guests forgetting adapters, etc. and was wondering if fitting a European socket in the house would be ok? I'm yet to confirm the actual voltage in her house but can't see anything wrong otherwise? She's provided adapters in the past...
  3. E

    Fix wire/cord lamp - Don't know polarity

    The wire of my lamp got cut and I would like to fix it by plugging in an extension cord. I understand the following tutorial: https://www.youtube.com/watch?v=lnncXVpoL3g But I don't know how to determine the polarity of the two part of the wire (+/-) in order to fix it. There is no ground...
  4. B

    Incorrect polarity and bad/no earth

    Went to look at a rented property yesterday and BG had been and said some sockets have incorrect polarity, located this to a double patrress and blank plate in cellar next to consumer unit, sorted this and then carried out a Zs to check readings and comes up with >2000, tried a trailing lead and...
  5. S

    Polarity of LED 12V MR16 downlighters

    Hi all Was asked to fit two transformers for shop window display. there was 8 12V down lighters in total split into two circuits and both switched through a timer, The owner wants to replace the 8,12V dichroic MR16 bulbs with 12V MR16 LED 1.8w bulbs. The reason he wants to replace the dichroic...
  6. A

    L-N Reverse On All Kitchen Sockets

    Hi, I am a newly qualified electrician and have a quick question. A friend asked me to take a look at a socket that was making an arcing noise after a water spillage so I went round to have a look. I ended up swapping the socket for a new one and this fixed the aching noise however when I...
  7. D

    Incorrect Polarity

    Can anyone give us some regs on the following. We recently re-wired a supply to an existing DB. The DB was supplying some 3 Phase condensor units. The new supply needed to come from the adjacent Generator backed board. Turns out the 2 separate supplies into the building 1 had reverse polarity...
  8. A

    3 phase problem

    Hi all This is probably very easy but for the life of me I haven't been able to discover the answer and solution. Three phase taken to a tpn fused isolator, then taken to a sub meter and split to three spn consumer units (each being sub metered again) The neutral has been taken to a Henley...
  9. E

    Reverse polarity on kitchen socket

    Hi Guys Looking to see if anybody can shed a wee bit of light, got a phone call earlier tongiht from a customer stating he was getting a shock from the socket and the sink. went over to have a look he advised he replaced all sockets with stainless steel ones and one kept shocking him so here...
  10. H

    Sequence of testing in BS7671?

    Can anybody tell me the sequence of testing that's stated in BS7671? At college I've been taught CRIPES, which is: Continuity Ring final continuity Insulation resistance Polarity Earth loop impedance (functional) Switching Why are these carried out in this specific order?
  11. R

    Polarity

    Can you really rely on testers to confirm polarity doing a Zs? im not convinced Is doing an R1+R2 the only way to guarente?
  12. M

    Strange fault on DC string ?

    Working in Wales yesterday, 9 255w panels and 1 SMA 2000HF Inverter. So we have 1 string of 9 panels in series. The roof was like this with each letter corresponding to a panel. [A]-[B]-[C] [DORMA WINDOW] [D]-[E]-[F]-[G]-[H]-[I] ABC panels in landscape, the rest portrait. All panels at same...
  13. S

    Am2

    Hi everyone, Im going to be doing my am2 in September, I'm very confident with the build. The only thing I can't get around is the live tests, what order do the live tests go in? Also some help on fault finding. Cheers jimi
  14. L

    Extending a cable with 'positive polarity'

    I have basic knowledge from my IT background. We were burgled so finally pulled my finger out to fit a camera... we got one 5v 0.4a plug (1 metre) you can prob guess where im going with this... ok so purchased 5mtr '2 core flat flex' cable to extend it... cut the original cable/plug in half...
  15. H

    EICR problems.

    Under what circumstances would a Sub-DB need to have MPB links to water and gas? I had always believed that the CPC of the feed from the Main-DB would be sufficient, assuming it had been designed and installed properly. Got a situation where you have a small Sub-DB in a caretakers office...
  16. Davehaywire

    testing dc cables

    well that was fun! very limited testing of dc turned up at job this morning a field of solar panels to test 5 mins instructions off we went carried out irpos to earth array neg to earth array polarity isc with test isolat voc managed to test 1 string pair on 50 invertors not bad for first day!
  17. W

    Legalities of incorrect polarity upon purchase.

    Hi guys, Now, on two occasions now, a supplier of some of our machinery have supplied machines with incorrect polarity within the plug tails.... on today's instance, this obviously ran the motor in reverse, and has caused irreversible damage to the machine in question. I have now correctly...
  18. kingeri

    L and N markings on front of RCD

    Morning all, many RCDs have N or L marked on the front of them, to indicate polarity, but just looking at a bunch of Niglon pre-populated CUs and the RCDs all have N in the top left corner on the front, which I thought meant the left terminals are Neutral, but the Neutral bar is in the right...
  19. 1

    Polarity Test

    I know an R1+R2 test will indicate Polarity but ignoring that, how do you preform a Polarity test? and how does it vary between testing on a radial, ring and lighting circuit? While im posting a thread, another question... when doing an RCD test what Amps do you test at? 10A? 30A? Thank you!
  20. F

    Reverse polarity and a microwave!!

    Good afternoon Gents, I was called out to a fault today where the guys microwave had been tripping the 32A CB for a few days and had now packed in altogether. It's a built in model and was connected via a switched FCU that had been wired up with L-N reversed. I have advised the guy to contact...

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