discrimination | Page 4

discrimination

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  1. H

    RCD Discrimination, TT systems and Ze

    Just installed a 5 way consumer unit in a garage/workshop. It's fed from a garage unit in the house. I've started testing and on the garage 5 way the RCD test is OK but the RCD unit in the house trips at the same time (apart from one random event). I'm not happy about this and a bit puzzled as I...
  2. La Poste

    RCD's in series

    I was having a chat with my electrical boss today about this and that and we discussed wiring a radial in a garden supplying various things like a greenhouse and a garden shed. He was of the opinion that things like greenhouses should be TT'd with an earth spike and RCD protected. The thing is...
  3. P

    DISCRIMINATION BETWEEN RCDs

    Morning Guys I know that if a 100mA RCD is followed by a 30mA RCD, the 100mA needs to be S type. If a 300mA RCD is followed by a 30mA RCD (Farm installation) does the 300mA need to be S Type? Cheers Pete
  4. D

    rcd discrimination

    hi guys im an apprentice and need some more understanding about rcds please may i have an example of rcd discrimination and what ratings i would use for different things and why thanks danny
  5. B

    Discrimination

    Hi, my first time on this or any forum, be gentle. I install/erect agricultural barns and more recently domestic sheds. I have recently taken my 17th regs and part P and before any one says anything, I am NOT now an electrician. I have in the past installed the electrics in the agricultural...
  6. L

    Discrimination of fuses?

    Hiya, Just wondering if any of you would be able to help me understand the I2t curves for discrimination between protective devices. (I have read that if the major fuse is twice the rating of the minor fuse then discrimination is achieved, but I am trying to work it from the I2t curves) I have...
  7. Y

    Linking two fused connection units from a junction box

    Advice please .Is it ok to put a junction box into a ring main then from that put a fcu with a 13amp fuse for a cooker hood, then from that fcu put another fcu with a 5amp fuse for 2 under cabinet strip lights using the correct size wires etc ?
  8. J

    sizing meter tails and switch fuse discrimination

    DNO has upgraded service fuse from 30a to 60a, they do not want to go any higher due to the main feed cable. CU is 4-5m away, connected via switchfuse. Should 16mm or 2mm tails be used, OSG recommend 25mm but seems to assume a 100a supply. With a 60a head, what size switchfuse should be used...
  9. S

    Supply to outbuilding - Protection of SWA and RCD discrimination

    Hi folks, Rural domestic property with 2 outbuildings. TN-C-S with additional earth rod (believe was upgraded to underground TN-C-S feed from old overhead TT feed and rod was left in place). Main house has the only RCD (30mA) in the whole property as the main switch and there is much nuisance...
  10. V

    high readings on RCD test

    just a quick one lads, I was sent to a job to change a trip in a pirilli box that was covering the cable going into the house. Then I changed the trip in the house that was covering the house its self. My foreman give me 100Ma time delay for outside and a 30Ma for inside, I thought that we had...
  11. the pict

    RCD discrimination to a RCO board

    I am doing a couple of board changes some re-wire, and replacing some VIR,However the PIR was not done by me, so I am more or less doing a new PIR and the remedial work as I proceed, I am using the original PIR as a guide also which, although done by a national company is pretty poor in some...
  12. L

    Correct discrimination?

    Id like to run a 20m 4mm2 armoured to a log cabin/shed type thing!? On a 32amp mcb on an rcd C/U Then have small garage type C/U in cabin but they always seem to come with 63 or 40amp rcds as main switch. Not sure where i stand with discrimination. Just a few sockets and lights in cabin so a 16...
  13. C

    Religious discrimination??

    Hi guys. I put ma bill in for 4 days very hard work with a lad for £1000 exactly and the bo had abit of a moan. He then said we'll sort it out when i get back off holiday. The bill IMO was fair. So i went in the office to say we'll sort it out now, coz things like this work me up. Im a...
  14. M

    Rcd

    I have a SWA cable running from my cu in the house to a cu unit in the garage. Does this cable have to be RCD protected?
  15. T

    another old fuse box

    hi all, here's another one i saw today which i wondered about. my mate was proudly showing me his new bathroom and i thought i'd have a nose at the electrical arrangements. he too has another old 1361 fuse box, with a new 13A 30mA RCD FCU installed on the wall above said fuse box providing the...
  16. L

    Sockets under Sink ?

    Most new kitchens you seem to have no option but to install sockets (for wash machine/dish washer etc) under the sink in the base unit. I do not believe there is any reg's restricting this but some kitchen fitters i come across still seem to think it is taboo (though they do it anyway). Am i...
  17. 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...
  18. M

    Help with discrimination

    Just been at Church hall with 3p TT supply, My query is we carried out a PIR on it,it has no 100ma rcd protection of church metal consumer units mentioned on cert but we are only certifiying church hall. Church hall has 100ma 4 pole rcd up front onto metal switchfuse 3036 60A protection on to...
  19. C

    60A Main fuse & NIC assesment?

    I was in my brothers house yesterday as I am possibly going to do a job there for one of my NIC assesments, and he has a 100A main switch, but the main fuse is only 60A (in a 100A holder). Ill check the size of the meter tails next week, but if they are suffecient, should we ask for the fuse to...
  20. K

    Enough Fuse Discrimination?

    Evening all, I am a newbie to this site and also to electrical work. I am currently a young road lighting technician at the local council and am studying for a HNC in electrical engineering, a G39 and a Diploma in road lighting standards. I have been in contact with a consultant and he has...

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