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  1. A

    poor rcd tripping times

    Hi all After having the shower circuit upgraded to 10mm cable, new shower and pull switch the tripping times recorded for the existing rcd are as follows. 76ms x1 65ms x1(180) 28.6ms x5 38.3ms x5 (180). These times appear not to meet the standards for the minor works cert and im after...
  2. O

    Gas Meter Room with Water Heater also Installed

    A large Commercial/Industrial HQ type building with Large Gas Meter installed within its own Gas Meter Room 1M W x 2M L x 3M H approx While investigating a suitable cable route I was concerned to discover that a water heater is fitted adjacent to the Gas Meter. Does any one have any observations...
  3. P

    What is the cause of voltage drop within an electric installation?

    hi guys, what is the cause of voltage drop within an electricinstallation?
  4. S

    MCS Accreditation Transfer

    Hi Everyone, So i finally came to the decision to make my exit out of the Solar PV industry and move onto other things. I have got a buyer who has been a surveyor for a National Solar PV company and has decided to take the reigns of his own venture. My only question i have which i think i...
  5. D

    3 Common terminals within a Fan Isolator switch

    Hi Guys I wonder if you can advise on a fan isolator I am installing.... On the reverse of the fan isolator I have the following markings: Top L1 (common) L2 N (common) Bottom L1 L2 (common) N Originallly I was going to...
  6. N

    RCD tripping times, 0.4 or <200 etc.....

    I always been told that an 30m/A RCD should trip within 200m/s (x1) and 40m/s (x5). But something iv never taken much notice of before is on test sheet the maximum disconnection time of a circuit less than 32A is 0.4. So....which is it? within 0.4 or within 200m/s????
  7. R

    How do you wire an extractor fan within a lighting circuit?

    Hi Guys, How do you wire an extractor fan within a lighting circuit? I have bought a 4in extractor fan i would ideally like to feed this through the lighting circuit. I have wired Lighting circuits and Ring Circuit at college but they have not taught us how to wire an extractors fan with timer...
  8. K

    Neutral lead on RCBO'S

    What exactly are the neutral leads for? and if a neutral to earth happened on a board with just RCBO'S in it, why doesnt the fault travel along that neutral and affect the other RCBO's?
  9. B

    underfloor heating advice please

    Hi I went to see a job this evening for a building firm that I do their electrical work for them reguarly. The house was extended last year which comprised of a lounge and 1 bedroomabove. the elecrical firm installed a seperate ccu with RCD protection with one mcb for the ring main for the...
  10. P

    Upgrade in TIC but still within band...rates?

    Hi I've got a customer on a 2kW TIC system but he wants to go to the maximum 4kW. Fair enough, but does anyone know/have any experience of what would happen to the FIT rate. Is it 43p for the 0-2kW part (installed Feb) and 21p for the 2-4kW part? How would MCS registration work? Just modify...
  11. N

    MCB vv RCD

    I was called to a customer today where the oven had blownup over the weekend. Well to be more precise the oven element had fractured and the moisture in the mineral had caused the element to pass current to earth. Now my understanding is that the RCD should have tripped out (which it did)...
  12. M

    How to minimise Costs within a Job.

    Ive been given a question on "state how the electrical contractor may minimise costs, with particular reference to CASH FLOW? I do not really understand how cash flow can minimise costs only that you ensure you price up a job correctly. Please can you enlighten me on this question Thanks
  13. rainstorm

    GU10 LED's

    Evening all, Has anyone been fitting "Lamp & Gear" 4W LED's? I've fitted quite a few, mainly in shop lighting to existing fittings, and have had a few failures, some within weeks. Some have been in downlighters and some in spotlight fittings (not enclosed). Just wondering if I've been unlucky!
  14. G

    Circuits within a shower room

    It is my understanding that all circuits in a shower room need to be RCD protected. Can someone confirm please
  15. SibertSolar

    DNO's stating that gen meters are not "Ofgem Approved"

    Hi all, I've had a couple of enquiries lately from clients who have been (somewhat surprisingly) informed by their DNO that the generation meter is not Ofgem approved. Why, all of a sudden, are DNO's deciding that MID approval is not adequate/accepted? Don't they understand the history/nature...
  16. E

    bonding structural steel buried within fabric of building

    was in a half finished house today that has just had an extension built on it, and i was suprised to see 10mm bonding to the steel RSJs that span the garage and where the kitchen has been knocked through and at the front where a porch has been created. traced them back to the MET, have all been...
  17. S

    Wylex bs 4293 100ma type s RCD Tripping times

    Does anyone know what the tripping times for an Wylex bs 4293 100ma type s RCD are? Ive been searching the net and just keep getting more and more confused about this i know an bs6009/9 should trip within 130ms-500ms but cant make headway for the tripping times for an older bs4293 rcd.
  18. J

    New proposal for DECC to (hopefully) allow good level of FIT within current budget

    If FIT payments were only for 15 or 20 years would this help with spending cap? I was thinking of asking Greg Barker, via my MP, if he had considered reducing the period in which FITs are paid. In my experience most customers only really care about payback and simple ROI so if it went down to...
  19. S

    ELECSA Certification Scheme ELECSA advice needed please

    hello. I was wondering if anyone could give me some advice to a simple question. How long does it take from booking an assessment with Elecsa till having the assessment? I'm interested in joining Elecsa but I just wondered how long people have to wait. any answer would be great.
  20. J

    Overhead cables within fabric of building

    A two storey extension has been built to side of a property. The supply is overhead lines which are clipped to the existing building with clamps on the ends from which the tails run to the meter. The problem is these cables are now going to be above the ceiling of the ground floor extension (if...

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