polarity

  1. C

    reverse polarity on appliance socket

    Carried out an eicr and noticed x2 double sockets have reverse polarity that supply a frying machine at high level. After correcting the reverse polarity on the two sockets i plugged the fryer back in and the circuit MCB tripped out and the appliance popped. I am unable to open the fryer up as...
  2. Gavin John Hyde

    Reversed polarity - who to blame?

    Been on a job in Warmley this afternoon, customer told by Knowhow/curry's that she has reversed polarity so couldnt connect washing machine. worryingly all faceplates were metal so not ideal! Go out and 230 between neutral and earth,nothing between line and earth. called western power who sent...
  3. happyhippydad

    Is the Steeple RCD polarity sensitive?

    Evening all. My customer has a series E consumer unit which has a 100mA MK RCD as the main switch. I am adding a socket to the socket circuit on this board so need to give it 30mA protection. I happen to have a 30mA Steeple RCD for a series E CU (I collect as many different CU's as I can)...
  4. S

    Combi Boiler reverse polarity

    Hi sparks. Gas safe plumber here please be gentle. Just went to a boiler breakdown. I traced the fault to the room thermostat so I linked it out on the pcb board in the boiler. The boiler is working fine now. 2 year old B&Q combi. While I was there I checked with my multimeter the supply...
  5. C

    Working live

    How many sparks would work in a square D KQ 3phase DB board if it was LIVE i was putting a new mcb in a live DB and it blown the MCCB at section board i tested between phases and there was no polarity between any conductors switched the MCCB and it tripped again WHAT COULD OF HAPPENED
  6. Y

    Problems with Series/ Parallel strings not adding ampage.

    Hi Guys, im hoping someone can help me. I have recently installed 3.2kw system for an offgrid job. The problem im getting is that im only ever seeing around 300 watts solar generation for the whole system. We have used 10 x Canadian Solar 320 watt panels Voc for the panel is 44.9 and the ISC IS...
  7. captaincaveman

    50 volts between nuetral & earth - Lighting/ fluescents

    Hello beautiful people. Quick one for anyone who may have an idea: Attended job today with a room with 2x 5ft fluescents not working and found 50v between N-E. I did basic tests on the fittings (continuity, ir, etc) - all ok. main earth and everything else ok. Checked the light nearest the...
  8. D

    Domestic Socket & See tester

    Evening, I use a Socket & See tester instrument to provide a means of confirming safe isolation before working on boilers. Can anyone explain why I am required to press the touch pad at the bottom of the test instrument in order for it to perform a polarity test? I understand what polarity...
  9. W

    Switch Polarity Question.

    During fault finding I came across a switch wire and a perm wire connected the wrong way would this still be known as reversed polarity ? As the connections are reversed?
  10. N

    Testing Zs on an IPS system?

    Hi all, Does anyone know how to test the Earth Fault Loop Impedance on a monitored circuit such as IPS? I have found in the past that even a Martindale Socket Voltage Tester can trip out the circuit as it is monitored. I also found that no matter which way the neutral and line test probes...
  11. D

    2394/5 tomorrow

    Hi guys got my 2394/5 written exams over the next two nights, wish me luck!
  12. 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...
  13. 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...
  14. A

    Domestic 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...
  15. 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...
  16. 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?
  17. 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...
  18. 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
  19. Heisenberg

    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...
  20. 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!
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