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discrimination

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  1. infinity

    Fuse discrimination code?

    While testing an industrial building today (machine shop) I came across a discrimination problem and cant decide on the code. There is a switch fuse with a BS88 gG 315A fuse that supplies a busbar trunking run in the machine shop that the machines plug into. There are various units plugged...
  2. paddyc3112

    discrimination.

    I have a 63amp mcb feeding a 60amp switch fuse which feeds a fuseboard - is this good enough discrimination??
  3. R

    Discrimination

    Hi All, My house is supplied via a PME cutout - Ze 0.07Ohm and the main CU is a 22W Split Hager Board with 2 unprotected ways and 3No banks of 4-6 circuits, each protected by a DP 80A/30mA RCCB I've just run a supply to my shed - through the house in 6mm T&E to an external Wiska box where I've...
  4. kingeri

    Eh? RCD protecting tails

    Some may remember that I've got an upcoming job to move 87 CUs about a meter in council sheltered accommodation. Just found out that they also want all the installations protecting with RCDs. I found this odd cos as far as i remember they all had split load boards with dual RCDs. I queried...
  5. kingeri

    Discrimination between BS1362 fuses

    Fused spur off ring with 13a fuse supplying 4x 3-gang fused socket outlets for a small computer area. Loads not going to be massive. Should the 4x 13a fuses in the 3-gang sockets be changed for a lower rating, e.g. 10a, to allow for discrimination between sockets outlets and the fuse in the...
  6. S

    Discrimination on upstairs board

    Saw an installation today where an upstairs consumer unit is run off a 40A MCB in the main board. Two problems 1) Both boards are protected by 30 ma RCD so no discrimination. 2) There's a 40 A MCB in the second board as a dedicated shower feed - the installers have put a 10.8 kw shower on...
  7. Y

    Yet another RCD discrimination thread ;)

    Hi peeps, just rewired a warehouse and had the simply genius idea of running an extra socket (spured off of one of the only circuits with an RCD in the entire building, of course) for the in-house technician to test faulty returns sent back by their customers. And naturally, one of the main...
  8. S

    Garage cu - discrimination

    Hi Am currently doing my 17th edition. Our teacher gave us a question to split typic domestic loads amongst the 10 way mcbs. This is what I come up with However one of my more experieced course mates said "All garage circuits protected by 2 x 30mA RCDs - no discrimination" I know...
  9. M

    3 Farm buildings

    Hi iv been asked to wire 3 farm buildings. The sub mains have to be RCD protected, Do i 300ma Main swt first ccu rcbo's 100 Ma second and use rcbo's and 30ma main swt and mcb's ccu? Any suggestions would be helpful iv red the green book and me head is hurting lol i could use a 100 ma upfront...
  10. S

    Fused Spur Query

    I need to spur off a ring main to two locations a Boiler Control and Downflow heater. Is there anything wrong with installing one 13A fused spur unit adjacent to a socket on the ring main and running both cables out the back of it to seperate fused spur units in the appropriate locations?
  11. F

    time delay rcds

    were would you use a time delay rcd and what are the benefits of doing so is it just in tt installations
  12. N

    30m/A protection on outside sockets

    As I'm aware all outside sockets must have at least 30m/A RCD protection . However.... The DB this socket is fed from has a 100m/A main RCD (the socket is off a 10A MCB). So it doesn't comply. But....this DB is a submains and is fed from another DB which DOES have a 30m/A main RCD. So does...
  13. C

    New supply tails in trunking or SWA?

    Hi, doing a garage conversion into habitable room and will have to move the CU. Currently it's at high level above the entry where the meter tails come through the wall. The CU needs to be moved to make way for a doorway and will be fitted approx 6M from existing position on the other side of...
  14. M

    Discrimination

    Does anybody have any detailed information on discrimination, or could explain in abit of depth for me. Ive read BS7671 536.1 and know the basics but would be grateful of any more information that could be provided. Thanks in advance
  15. W

    Farm Installation help

    Hi all Went to look at a job today on a farm , 3 phase board with 75mm supply on a 100 amp 100 ma rcd mainswitch, with a submains out to the house , which is also protected by another 100 ma rcd, problem is every time theirs a trip in the house it trips at the main distribution board also which...
  16. the pict

    discrimination acheived ?

    I recently fitted an outdoor socket primarily for a midge machine, although knowing the homeowner anything may well be used on it, from the kitchen RFC on a 2.5mm T&E spur I fitted a selfcontained IP X5 clipsal unit with 25A RCD and fitted a 16A MCB, I have RCD discrimination @1X and the upfront...
  17. I

    mcb discrimination

    hi looked at a job today 32a mcb feeding outbuiding CU. out building cu has 20a mcb for radial sockets is this ok re discrimination (mcb's in series) im sure it is but thought there was a specific ratio
  18. telectrix

    Discrimination????

    first time i've seen this before. 100watt vivarium lamp blows, takes out 3A 1362 - through stat - takes out another 3A 1362 - back to CU- takes out 16A MCB. must have been a hefty short lived fault current.
  19. P

    will discrimination be achieved?

    hi peeps, just need help with this quesion. The proposed design for the installtion includes the following protection devices: > BS EN 60898 type D circut breaker for the MIG welder > an MCCB rated at 125A for the distubution circut to DB2 Determine, using manufatures info, weather...
  20. Baker1988

    Discrimination

    Hi everyone i have read on a few post people saying about discrimination on a circuit what is it that they mean i have read a few things and it seems to mean a few things can any one let me know as i am unsure

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