rcd's

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  1. A

    RCD tripping on new cu

    I have installed a replacement (split load) cu fitted with two RCD's. Prior to this I tested all circuits for polarity and insulation and found no problems, except for no (connected) cpc's on the lighting circuits and class I lights on the ground floor which are to be replaced with class II...
  2. S

    RCD not tripping

    Last month I changed a consumer unit and all was well. Now neither of the RCD's are tripping correctly. I get either >50v or >40ms. Could this be 2 faulty RCD's? the make is Contactum and the elecsa guy I spoke to today didn't seem too keen on them. Idea's most welcome Carl
  3. the pict

    L & N Volts

    I was round at my local changing some busted kitchen sockets and I thought I'd give them a quick Zs PSC PFC check however on one I was reading 240 V L N and 67V N E the meter would not do a PFC and the PSC was 660A with a Zs of 45 Ohms which is within range more investigation is needed...
  4. stidge

    RCD to RCd

    Running a feed to garage from dual RCD CU.Would like to fit RCD CU in garage but have heard that this might cause nuisance tripping( RCDs acting against each other)???????? Have seen this before on various jobs ie RCD controlled radial to RCD socket !!! Would like your opinions/answers on this...
  5. T

    RCD's

    Hi people, Can any tell me what would make an RCD take a long time to disconnect, i understand they monitor the line and netural wires but what would make them take a long time to disconnect or not even trip when testing. Many Thanks.
  6. B

    Max Zs readings where circuits are protected by 30ma RCD's

    I have noticed, a lot of max Zs readings on test certs (Where RCD's are applicable) are being blanket recorded at 1667 ohms. On a personnel note I consider this to be poor practice, and prefer to see max Z's taken from tables 41.2 41.3 and 41.4 of chapter 41 of the good old guide. My reasons are...
  7. Jimmy Boy

    Do we use the correct type of RCD's for our installations ?

    Just as a matter for friendly discussion, I think most of the sparks on here know which B or C type breaker etc to use for a particular application, but do we give any thought to the possible different types of RCD's there may be and their applications ? Setting aside time delay which is common...
  8. richy3333

    Caravan hook-ups, RCD's not tripping @5XIn and earthing (PME)

    Hi all. A local caravan site has asked me to test their RCD's. I popped in to speak to them about what they wanted and had a quick nosey around with a view to returning and undertaking the work. The 32 electric hook-ups are fed via a 3 phase system which splits into 3 circuits. Each...
  9. D

    RCD test - 2 RCD's in sequence

    I have a garage install protected by a 30mA rcd and a 32A breaker at main DB in dwelling, I then have a new CU in garage which also has a 30mA rcd protecting sockets and lights. When I do the RCD test I am getting bad results. When I do the 1 x the RCD in the garage CU is not tripping but the...
  10. D

    RCD's in parallel

    Hi, Working at a house (TT system) and a new build office/garage is to be built. House has split load RCD board. 1. Should i use 1 of the spare ways and feed the office with a sub-main. or 2. Use henley blocks and take the supply from meter tails. Option 1, will mean if the house trips then...
  11. K

    RCD's and SELV circuits

    just wondering if there is any need to provide RCD protection to SELV circuits in locations containing a bath??
  12. K

    Whats with these old single core lighting cables! Both RCD's tripped together

    So im replacing an board for a new 17th dual and ive decided to put the upstairs lights on one RCD and the downstairs on the other, you know how i was taught to to do it so it minimises inconvenience if a lighting circuit trips, you know. But then i come across these single core wires...
  13. D

    Rcd

    Commercial greenhouse - panel has a 4 pole 40A 300mA rcd feeding 3 x 3phase 16A socket outlets with 25A 30mA rcd's built in. Under 17th edition is this 300mA illegal. Customer wants local RCD's for ease of nuisance trips.
  14. L

    Using 2 100mA RCD's for essential and non-essential circuits and nuisense tripping

    Hi All. I'm working on a project in Northern Ireland. The supply is protected by a 100mA RCD which is regularly triping due to many items of our plant have high earth leakages. We have a large IT area, which, as many of you will be aware of, has a high earth leakage. We also have a good few...
  15. Dic Penderyn

    "Informantion on RCD's"

    :D As this forum as passed on some great info. To say thanks I hope you find the attachment useful!
  16. B

    RCD's in a commercial environment

    I am carrying out PIR's on a number of commercial installs I find that even with intalls less than 2 years old, the installers have failed to protect many relevant circuits with RCD. The type of commercial property I am testing is the type with a lot of computers, TV's, sockets for...
  17. J

    Transformerless inverters and type B RCD's

    Currently looking at a 99kWp system, using 6 x SMA TriPower 15000TL transformerless inverters. I've been digging into the requirements for the elusive type B RCD and have found a handy guide from SMA here: http://download.sma.de/smaprosa/dateien/7418/RCD-UEN103120.pdf Page 8/11 is...
  18. C

    RCD's Again.. And my head hurts!

    Hello chaps. I hope one of you scholars can help me with this. Part re-wire to 2 storey flat. I have installed 8 lv downlights to down stairs kitchen, and 10 to up stairs lounge.. Now when i attempt to turn them on the RCD is tripping. Now, both 6A lighting circuits, split up and down are on...
  19. D

    RCD's

    HI all. I'm a newbie trying to learn as much as i can to get a head start for when i start official training, enjoying it so far! I had a thought regarding RCDs, I acknowledge its probably not cost effective, but would it be acceptable to have every socket in a household as the RCD incorprated...
  20. P

    Split Load Board Certification Question

    Hi,How does everyone fill out the certs for a split load board to include the RCDS if issuing a DOMESTIC ELECTRICAL CERTIFICATE? How do you include the details of the split loads and the submain RCD characteristics into the boxes provided? Do you test RCD tripping times for each circuit even if...

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