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100ma

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  1. R

    Help with RCD - 100mA to 30mA

    Visited a job yesterday in an office to look at extending a ring to add some additional socket points - the existing RCD / isolator which covers the whole installation, is a Wylex 100mA 63A (fitted in the consumer unit). The installation has no 30mA RCD cover on the sockets. There is a second...
  2. 1

    100mA Main RCD Cut Out before 17th Edition Consumer Unit?

    Just a quickie please:thumbsup If a seventeenth edition consumer unit (with 30ma RCD's) is fitted after an already installed 100mA RCD will there be any discrimination issues? The reason I ask is because I'm sure I remember a while back when I was doing a job with somebody else that the MAIN...
  3. G

    100mA Type S RCD as Main Switch on TT Zs of 188 Ohms wouldn't trip.

    I was testing the above RCD yesterday on my Megger MFT1553 using the Autotest function set to the correct trip range of 100mA but I couldn't get a response from the RCD even at x1. At this point, the meter would simply flash <50V. I then retried the test using the manual functions but still got...
  4. 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...
  5. M

    100ma rcd tripping times please???

    Does anybody know the tripping times for a 100ma 100a rcd, x1 and x5 many thanks for your previous help earliar.......................;)
  6. M

    100ma or 30ma??????????

    Hi Everyone, a quick question for you all, if on discovering a property had no main incoming earth, there were no earth block (tnc-s) to connect off either, you installed an earth rod and the reading was acceptable below 200 ohms, i think, what would you use on your fuseboard for your main...
  7. M

    100mA / minor works

    A domestic TNS installation has a 100mA RCD main switch and 'Type 2' MCBs. I Need to move a kitchen socket away from a hob, install an additional one, install a fused spur unit for an extractor hood, and move two light switches to the other side of a room. The customer is a right pain and it...
  8. D

    100ma rcd tt

    Just checking, Did a PIR earlier for a mate and his rental property is TT cpvered by 100ma RCD wired in accordance with what ever reg was out at the time..! ZS @ 100ma = 500 ohms...?? am i correct !!??? cant remember top of head..!
  9. I

    TT 100ma Rcd + earth electrode??

    Hi al,l I am working on a tt system at present. I am going to be a adding a new d/b which will be ran from an existing board which has a 30ma main switch, controlling 1 other circuit i need to change the main switch to 100ma and the 1 circuit its controlling will need changing to a 30ma rcbo as...
  10. B

    TT 100mA question

    Hi fellas quick enquiry regarding the above. Went to an installation yesterday with this layout: cut out - 60A metal switched fuse - plastic consumer unit. All equipment fitted at a height of 2.8 meters, all conductors and main tails in trunking. Does a 100mA RCD need to be installed to...
  11. K

    100ma RCD

    If a building has a 100ma RCD unit as a main switch would you insist on a 30ma one also to protect socket outlets on a PIR main switch as an rcd doesnt comply anyway. im thinking code 3 Also a spur taken of a spur ive coded as 1 as its a fire risk imo, would you agree?? no main water bond...
  12. D

    100mA rcd

    Can a 63/100mA S type rcd be used for ring circuits (16th edition install 3 rings rcd protected) failed on the TD setting passed on non time delay?? MAC
  13. S

    WYLEX 100mA 80A RCD

    Hi all, Does any one know if a WYLEX 100mA 80A RCD WEM 80/2 is time delayed. It currenty protects a TT system and I will be upgrading the consumer unit to an 17th edition unit with 2X30mA RCD's. I worried about discrimination, and dont want it tripping before the 30mA RCDS's I know removing it...
  14. S

    replace 100mA RCD

    Hi, I have a job lined up to update a consumer unit, It is a TT system, there is a 100A 100ma RCD unit between Meter and the consumer unit, the customer wants this removed. If I fit a Slip board consumer unit, 100A mains switch and 2 X 80A 3oma RCD so all circuits are coved by 30ma RCD, is...
  15. L

    CU split board - 30ma / 100ma , problem or not a problem?

    been looking at a cu today, sum of us had a discussion about rcbo's n rcd's. Righty, what we have is a split board, 30ma rcd on one side, and 100ma s type main switch on the other. Got Cb's on the 30ma side which is fine, but on the 100ma side theres 2 x 30ma rcbo's. Now does this contravy...

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