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  1. M

    Repeated underground cable fault

    Having worked in America with their weird systems,thought I'd seen it all,but this has got me puzzled,a rep[eated failure of a cable at 33kV supplying a house and dairy,the cable of a type used by Country Energy,is rated for 132kV,400A per phase,supplying a 433-250 400kvA transformer.The cable...
  2. M

    Busbar 'ductor' testing

    Just been asked to carry out a busbar 'ductor' test on a new busbar installation , I understand it's a form of low resistance test checking the joints etc... But have'nt a clue how to test it ?! I know you use a 'ductor' tester but that's about it ! any tips or help would be much appreciated lads
  3. A

    Minor Works Views

    Hi All Just wanted your views on this The company i work for has installed a new replacement boiler and we haveinstalled a new programmer and wireless room stat. we are using an existing circuit so a minor works will be used. I’ve been told I’m going overboard certifying it, but i believe all...
  4. G

    Sunday Times Business section

    Apparently the treasury have focused in on ECO a costly scheme which accounts for £69 of the average energy bill. They then state another scheme that could be removed is the feed in tariff which costs the average household £6. Announcement to be made on December 4th. Be prepared for some...
  5. C

    AM2 Questions

    Hi all, I have my AM2 on Monday and I am just after some last minute tips and advice. I also have a few questions I could do with answering. 1. When testing PFC on a 3 phase board, is it nessecery to double the reading between Phase-Neutral to gain the Phase-Phase reading? and why? 2. When...
  6. K

    Split concentric submains

    I am currently on a big flat development project (old high school being converted to 50 flats, plus a 3 phase landlord supply). I had planned on installing 25mm 3core SWA for all flat submains as the Flats are all Electric with no Gas. However, i am now considering installing 25mm or 35mm split...
  7. D

    Charity Jobs

    Seen a guy do a free job on here over weekend and got me thinking how many other people do free jobs for the needy, I'm thinking of doing a couple if jobs a year for free for those who I think genuinely need it, If I got spare parts and spare time I think I could manage make someone else's...
  8. S

    RCBO trip times - no, not the usual what should it be . . .

    I was doing a board change today and 10 out of the 15 RCBO's were returning a value in the region of 19ms at 1x and 30 at 5x. Tried more than 1 MFT (both Metrel but got the same sort of results). So this is still within the 40ms's but with new RCBO's would you personally accept or return them?
  9. G

    disconnection times?

    found this today on a pre sort-out inspection: all appears fine apart from the downstairs sockets not on the RCD side...split load board to the 16th ed now lets pan down a bit: yep...its TT...heres some more: i wasn`t too impressed with the workmanship here either: went into...
  10. D

    Three Phase Board 230V

    Just after people's opinions seen this a few times and although not incorrect still makes me think: Three phase board 8-12 ways usually linked out to run on a single 230V supply. Seen second hand boards converted using bus bar to make in affect a 36 way single phase board. Always have been...
  11. Simonslimline

    ELI on no trip with Megger MFT

    Does anyone have issues with this test and how accurate is a No trip test? I find my readings seem to change a fair bit testing the same circuit a few times. This is using a 1730.
  12. M

    Circuit design

    Hi, after abit of advice. Wanting to install a new aditional circuit for a lathe. Technical info on label says this lathe runs at 3 phase, 2500 rpm 54A. There are already Lathes installed with same spec but circuits installed to run these are currently BSEN 60898 type b breakers, using 4mm...
  13. T

    Floating earth - generators

    Evening gents, i was wondering if anyone had any links or if someone could explain in leymans terms Any information about floating earths in generators, never had any experience in them and hate not knowing things when they could come in handy one day!! Doesn't have to be any specific just a...
  14. A

    3 Phase meter reading correctly?

    Hi Customer has a Polyphase Energy Meter, connected to the incoming 3 phase supply. Her bills are a bit high, but I was wondering as she is only using 1 phase, is there any value (ie cheaper bills) to spreading the load over the other phase's? Any thoughts appreciated
  15. A

    all this rubbish about "volt drop"

    the little boys on here worry about a bit of volt drop a few volts it happens all over the world children what the heck wrong with with a bit of volt drop? things still work thats all that counts
  16. richardg

    Testing Times!

    Good evening gentlemen, some much needed advice is sought. I have spent the last 9 months exploring the finer arts of domestic EICR. This is as you can imagine - a steep learning curve. Whilst I feel reasonably confident in the domestic sector the sniff of my first commercial EICR sends panicky...
  17. S

    Voltage optimisation technology? any experience? thoughts?

    we had a site visit the other week by a sales rep and an engineer of a company wanting to sell us a 'voltage optimisation unit' for the factory. They have today sent me through a proposal. They have contacted our electrical supplier, and obtained our site voltage profile for the last year. What...
  18. R

    Taking out the Cut-out fuse

    I went to the NICEIC Live day at Epsom last month, and Tony Cable, in answer to one of the questions, said that SSE had given specific Domestic electricians permission to remove the cut-out when, for example, they are replacing the Consumer Unit. Can anyone tell me if this has been done and if...
  19. N

    Max PSCC 1 phase and 3 Phase

    Hi all. Prospective Short Circut Curret. Now , if you measure the impedance on a installation P to N , and get a reading of 0.21 OHMS , the max current flow between these two points P and N will be 230/0.21 = 1095A.....1KA. Now if you have 3 phases , and each are the same impedance P to N ...
  20. The Solar King

    Misleading Sunday Times Article on PV

    Just received this from the STA: "Many of you will have read the recent Sunday Times article in the Money section titled “Has the sun set on solar power?”. This is a very frustrating and biased article, riddled with errors, misstatements and in some cases, misrepresentation, in particular...

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