discrimination | Page 5

discrimination

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  1. S

    RCD discrimination

    Hello everybody. I would like to understand how discrimination works for rcd's if say for say a garage supply you would put in a 100mA rcd, while the main board would be protected by a regular 30mA. So this ensures that a fault in the garage will not disturb the point of origin but I don't...
  2. S

    Discrimination for RCD protection on garage CU

    Hi all, This is my first post, hopefully someone will be able to confirm my suspicions. I am newly qualified so need a bit of hand holding sometimes. I am most probably going to use this piece for elecsa part P registration as its notifiable, so better get it right! I am fitting a garage with a...
  3. S

    RCD discrimination

    I am trying to design a wiring layout for an outbuilding which will be fed from the main house supply. The main house supply is protected by a fairly old (20yr) Crabtree 100A RCCB with a 30 ma trip. (No time info marked on the unit but is to BS 4293) I want to protect the outbuilding with a...
  4. keniff

    discrimination

    hi guys this always gets me. im just doing my relatives kitchen, theres already sockets in there but i have added a few more. the ones i have added are on a new circuit and the existing are on the downstairs ring. what do you think i should label the circuits as? kitchen/downstairs sockets and...
  5. R

    Outside Socket

    Hi there, This is my first post hope you can help. I have been asked to fit an outside socket so was going to split the kitchen ring main and loop to the outside socket then back to the kitchen ring. The CU is single RCD portected for all circuits and the outside socket is IP56 with RCD...
  6. K

    RCD protection query

    I am adding a switch (the wiring which will be chased less than 50mm deep into the wall) to a lighting circuit in a house where all the circuits are protected by 1 RCD, obviously this does not provide any discrimination between circuits. In order to provide RCD protection for the lighting...
  7. S

    Discrimination issue

    Hi everyone I hope that someone can shed some light on a small probem I have inherited. I have a submain suppled directly from a Henley block - 25mm tails to a 63A 100mA RCD main switch and a 40A MCB. This supplies a small inhabited outbuilding via a 16mm SWA cable to a C.U fitted with a...
  8. zone77

    discrimination advice

    need advice please. i am adding 2 sockets in a kitchen and bonding gas and water mains.the circuit is a ring protected by 32 A bs3871 and the consumer unit has a main switch which is 30mA rcd. do i need to provide discrimination ( install ring into its own rcd DB) or can i leave it as it is.
  9. E

    2 RCD's

    Hi guys I was just thinking about what someone put about a question I asked a couple of days ago. I asked about putting an RCD proceted fused spur on a ring main to feed an outside light. they said the RCD fused spur will be fine as long as its not protected by another RCD on the cu. My question...
  10. S

    Garage job

    I have just installed a small CU in a garage It's feed from the house view 2.5 swa. In the garage i have installed a small CU with a 30ma rcd and 20amp MCB with a Earth rod in the garden. When I started testing the RCD in the house trips on the RCD test but not the 1 in the garage. The...
  11. D

    Discrimination problems

    Hi, I have a 3 phase supply with each phase going to it's own consumer unit. There is a 3 phase isolator between the supply and each board. The isolator has 32a BS88 fuses on each supply. My problem is that the fuses in the isolator are blowing before the RCBO's are tripping on the single...
  12. B

    discrimination

    Hi with a 100A 1361 cut out and 100A main switch in the CU , when fitting a switched fuse unit in a long meter tail run would you make it 80A to allow for descrimination of the fuses. Cheers
  13. 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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