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  1. D

    Omission of overload protection for fixed loads.

    Been reading various threads with regards to having an mcb that exceeds the cable rating thus only providing short circuit protection, what surprises me is the negative responses that are posted if it is ever suggested. Now lets try put a translation on the regulation specifically 433-3-1 (ii)...
  2. C

    RCBO Trip times very strange.

    Hi when testing an rcbo trip times with 2 vapour proof fittings switched on the times were 378 on times 1 and 154 on times 5 but when i test the rcbo with the vapour proof fittings switched off the times are 21 times 1 and 19 times 5 has anyone had this before. i am using a calibrated robin...
  3. M

    RCD tripping

    Hi All I have a prob i hope someone has come across clients RCD is tripping at odd times. Doest seem to be any pattern or any specific piece of equipment causing it. Not one particular circuit either...trips on downstairs ring, upstairs ring, lightings ...you name it. Wont reset until all mcbs...
  4. gazzamikes

    RCBO's or two split loads?

    Evening everyone, In process for tendering for a job, 3 floors and cellar, presently 14 rooms, going to be extended to have another annex, conservatory and another extension for kitchen. Im thinking the way to go on this one is RCBO's, splitting it so each floor has a socket circuit and a...
  5. S

    How do you split your loads?

    After some advice really.. I have the following circuits on the first RCD: 1)Upstairs Lights 2)Downstairs Ring 3)Kitchen Ring 4)Intruder Alarm And on the second RCD: 1)Downstairs Lights 2)Upstairs Ring 3)Garage 4)Cooker Would you have done anything differently and if so, why?
  6. S

    Choosing the Generator For The Load

    I need to provide a generator to site. Do I check the current rating of all the equipment to be used at this site (It isn't a large site), total them up and look for a generator with that load capacity? Is it that simple or am I missing something?
  7. D

    Megger 420 PAT TESTER with loads of Extras

    I have FOR SALE A megger 420 pat Tester 11 months old only used on my own household appliances has loads of extras printer,barcode scanner, microwave leakege tester, see the whole lot on ebay item N/o:321016668405 Can be bought for £950 the whole lot
  8. B

    3 phase heater with imbalanced loads

    Hi All I would appreciate your help with the following. I am familiar with standard calculations such as calculating the current draw on a three phase heater battery when the loads are balanced across the three phases. I have recently come across some equipment where it appears the heater...
  9. C

    Tearing hair (and RCD) out

    Hi have a problem which I hope that somebody can shed some light on. New install on existing TT supply, with two DBs fed from an SWA sub main with 100mA S type RCD and 100A switchfuse at the origin (no other loads on supply). DB 1 is for a new install and all circuits are protected with 30mA...
  10. W

    Megger MFT1720

    Want to purchase one of these. Anybody got views. How about this 2 wire testing:ack2:
  11. C

    rcd not tripping on test

    Hi All Changed a C.U today, Volex (not my choice but customer supplied it) Dual RCD, one 80A & one 63a. All test results good except on RCD test at socket outlets. on half test all OK, on 5 x test all OK but on 1 X test @ 180 no trip but fine @ 0. Ramp test ok. When tested at RCD with mcb's...
  12. I

    getting 0M ohms L- N on Lighting Circuit and cooker Circuit...

    ....but RCD doesn't trip? Surely if it has a short circuit somewhere I shouldn't be able to liven the installation??
  13. S

    How to estimate loads for electrical application (UKPN)

    Hi, I am dealing with alot of applications to UKPN. What would be the best way of estimating loads for this application. Am i right in thinking that for an office environment, going by the BISRA rules of thumb: Lighting 12w/m Power 15w/m Heating 70w/m Cooling 125w/m multiplied by the floor...
  14. S

    B or C type breakers?

    Hi guys having a brain fade moment. Any reason why I can't use C type RCBO's instaed of B? Doing a CU change at a Nursing home and been quoted for C type, currently they're B type. Board is 3 phase but all breakers are single phase. Thanks in advance. Steve.
  15. F

    Cable size - 3 Phase supply - Single phase loads

    Hi All Got a 3 phase 20A per phase supply coming in, feeding 2 gites. The owner needs the 3 phase supply to also feed a new house 66 meters away. The house will only single phase loads and probably be unbalanced most of the time Now the tables I have, show that for a single phase - the wire...
  16. J

    Fuse size

    Just wondering after doing a job today, what is samllest fuse size you would use for sockets in a kitchen if there wasnt a washer or dryer in there ? I put a 32a mcb with 4 double sockets and a single and when all finshed i did think with the loads present surely a 25 or 20 mcb be ok. I always...
  17. S

    RCD Problem

    Hi, i have a problem with an RCD in a Garage unit - 1/2 30mA no trip, 1 x 30mA >300, 5 x 30mA 17ms. Any ideas what could be happening for the 1 x 30mA test. Cheers
  18. F

    How to Calculate Connected Loads

    I am currently training as an electrician and have been set a question and was hoping someone please explain to me how to calculate the connected load if I have a mixture of single phase and three phase loads, and I have a three phase service connection from the utility. For instance, is the...
  19. T

    Dodgy Installations

    With this rush, have you seen any Pv installations that break the rules? Here are a few I have come across,
  20. G

    Solar design

    Hi am new to the forum, have recently become a MCS installer via NICEIC am struggling a bit to make my mind up about the design side of the job to either go for PVSOL or equivalent as i have had contact via a couple of companies that will do all the design etc and sell the kit but obviously...

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