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  1. L

    Correct way of wiring MCB's, some technical advice please

    Hi all, and thank you in advance for any advice and links. I am currently working in Afghanistan, mostly on American systems but the part in question is on a British section of the FOB Im working on, Its 230/400v 50hz system, In a lot of the panels the americans have wired the MCB's backwards...
  2. N

    mcs log in help

    Finally after 5 weeks of Napit mucking me about i've been told that my paperwork has been sent over to mcs.Been told will be on there system friday but poss taken another 2 working days to recieve gem log in password.Is this correct hope not,just need to sign my own install off and if this...
  3. D

    Supply Cable Size and correct socket ratings!

    Hi Guys, In our place we have several machines that are fed from 63A sockets. The supply cable to the machines is CY and currently 6mm has been used which is no good for 63A But the 63A sockets are fed by a 32A breaker. Is it ok to use the 6mm as the socket is fed by a lower rated breaker...
  4. ringer

    Supplier's fuse, disconnection time and max Ze

    Have a job where Ze is 0.36 ohms on a TNC-S with 80A BS1361 suppliers fuse. The general rule, as per OSG (page 11), is if Ze is below 0.35 ohms then this is acceptable, but that relates to a 100A fuse (OSG fig 2.1 on page 15 refers). Now I believe that this installation should comply, so have...
  5. H

    Will i still achieve the correct qualifications to get a JIB card?

    Hi I started my apprenticeship in sept 2007 and left due to problems at work, I left in January 2009. I achieved my level 1 hand skills and did my 2330 201 exam. I am now back at college on a part time course 1 day a week with the other modern apprentice's finishing my level 2 (will take my...
  6. C

    wylex main switch rating

    I have just carried out a PIR on a property with an old Wylex 4 way rewireable fuse board - I understand the the main switch isolator on the board is a Bs.5419, but am concerned at the amp rating of the Main switch - I always understood that the small boards were rated a 60amp and the larger...
  7. M

    oval conduit

    Hey I need to use some oval conduit. What size is correct for 2 * 2.5mm twin and earth 13mm , 16mm , 22mm, 29mm At a guess i would say 22mm is that correct?
  8. C

    Correct invertor??

    Hi, Having a system fiited soon and have been quoted for a 3.50Kw system they will fit a Sunnyboy 3000HF invertor. I was wondering if this will be big enough or is there a percentage loss from what the panel generates to what type of invertor is needed. TIA
  9. D

    rcd will not trip

    hi all, think i am have a blonde day today, went to do a fuse board change in some bedsits as the builders had been thrown off site (have covering letter from the local council to carry out works) basicallly all wires prepared at board but no board, so installed a 16th board and can't get the...
  10. D

    Correct Way of getting the PFC

    I've always thought it was ok to get your pfc when getting the Ze. I never been flagged up by NIC for doing it this way etc before. However, I've now been told I should perform Ze seperately and the PFC separately as all the earths need to be connected. It makes sense as it should be a lower...
  11. C

    Enrolled on 2391 today!

    £680 that I hope will be a worthwhile investment for my career! More exams...joy :iamwithstupid:
  12. L

    Correct discrimination?

    Id like to run a 20m 4mm2 armoured to a log cabin/shed type thing!? On a 32amp mcb on an rcd C/U Then have small garage type C/U in cabin but they always seem to come with 63 or 40amp rcds as main switch. Not sure where i stand with discrimination. Just a few sockets and lights in cabin so a 16...
  13. S

    And now to correct the mistake...

    The labourers who were putting the cable in a trench for a job have finished but left me 4ft short of the Isolator.  So it's SWA. Best way to extend it? Henley blocks in a metal clad box? Know where I can find that?
  14. S

    Correct MCB ???

    Hello guys. I am new on here and wanted to get involved. Firstly, I am on route to becoming a domestic installer and now becoming very inquizitive when I see other peoples installations.. And for the record, I know i have a LONG way to go before I would consided myself competent ! At my...
  15. C

    RCD instantly tripping??

    Evening, Just installed a new CU for a customer and one of the RCD's trips as soon as its switched on, even though the circuit beakers arent even on. Any suggestions about how to look for the fault? Its 3 socket radial circuits that are causing the problem as it will stay on when I disconnect...
  16. L

    correct way to test for a extraneous conductive part

    Hi everyone Can someone please clear up exactly how to test if something is a extraneous conductive part, is it using a insulation resistance tester? I have a installation where the incoming water is in plastic then copper throughout the installation. If someone could clear this up it would be...
  17. L

    correct way to install on roof with concrete tiles

    Curious for some advice - assuming I select an installer that I'm comfortable with what should I be looking for with how they plan to mount the panels to the roof? The house is about 20 years old with a roof built from trusses on 400mm centres using concrete tiles. I'm not sure what the...
  18. R

    Testing help

    Morning all! Just completed my two jobs for my NIC assessment. Confident in my work and all of my test results etc. Anyway assessor had a cancellation so has booked me in for this friday so just wanted to double check a few things that are playin on me a bit. Nothing major but just wanted to...
  19. T

    3 phase meter

    Hi there i was called today to replace a 3 phase meter at the side of a consumer unit because it didnt work,i have replaced it with a new one and the dial on the meter still does not go round. I have replaced all 8 cables as was but am now wondering if they are in the correct order. Can anyone...
  20. Goody

    IR Testing; what is the correct procedure?

    Whilst testing Insulation Resistance between L & N, L&E and N&E (radial or a ring circuit); I know the L and N should be disconnected from the bars but should the earth be left in on the earth bar on the DB or should be removed? I had been doing IR only by disconnecting all the three from the...

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