disconnection

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  1. S

    Disconnection time of external bulk head...

    i need your help please this question is going to be a long 1... first let me explain the situation... Electrical Supply The electrical supply to the house is 230V, 50Hz, single phase and together with the installation forms part of a TN-C-S system. The electrical intake position is housed in...
    • Sparky12021986
    • Thread
    • aus bulk disconnection external time
    • Replies: 8
    • Forum: Australia
  2. R

    Supplier's fuse, disconnection time and max Ze

    Have a job where Ze is 0.36 ohms on a TNC-S with 80A BS1361 suppliers fuse. The general rule, as per OSG (page 11), is if Ze is below 0.35 ohms then this is acceptable, but that relates to a 100A fuse (OSG fig 2.1 on page 15 refers). Now I believe that this installation should comply, so have...
  3. E

    cooker disconnection reconnection

    Hi guys. In a week or so I have a oven thats in need of a new cupboard/unit that houses it. The plan is to isolate securely, disconnect, inspect/test the supply, and assuming all goes well to this point, fit the new cupboard/unit and then refit and reconnect the oven, MWC. Everything is going...
  4. La Poste

    5 second disconnection time

    Just a quickie to refresh my memory. TN system disconnection times. Final circuits not exceeding 32 Amps. 230V 0.4 seconds. (table 41.1 page 46 BRB) Final circuits exceeding 32 Amps IE fixed equipment and distribution circuits. 230V 5 seconds. RCD's are used for socket outlets not exceeding...
  5. D

    Disconnection time with a PV sytem installed.

    Hello all. Could any experienced sparkies please please explain to me how RCD tripping times can be adhered to when a PV sytem is integrated into a domestic consumer unit if the inverter takes up to 5 seconds to isolate the AC outputwhich it feed to the domestic supply at the consumer unit. Fed...
  6. W

    TT Max ZS loop reading for circuits over 32A

    HI all anyone know the above, i put 1667 ohms in the box normally for all TT circuits but noticed the other day it is only for circuits upto 32A Anyone enlighten me, i need it for a 50A and 40A circuit?? thanks
  7. cashnotakite

    "just bang it on an RCBO!"......... TABLE 41.3

    this slightly confuses me; whenever a Zs reading comes up too high, e.g on a particularly long run, to get around the problem if you cant change the MCB rating, I get told to change it for an RCBO. Table 41.3 of the regs gives max Zs values for both MCB and RCBO protection. If our Zs value...
  8. S

    PIR on property with disconnected supply

    Hi folks, client has requested PIR on a property with disconnected supply (not sure how disconnection has been effected). Property has been empty for a long time and potential buyer (retired electrician - no pressure) wants to know as much as possible to see if price can be negotiated down...
  9. R

    disconnection times

    Circuits under 32A the disconntion times would be 0.4 and anything over woud be 5 am i right.
  10. C

    Disconnection time for distribution circuit

    I'm looking at remedials from a PIR and one thing is a switch fuse with an 80 amp BS88 is serving a 16mm run of 2 core and armour SWA which serves 3 sub boards in 3 seperate outbuildings and they have been wired so they loop in and out at henley blocks until the final sub board. The total run is...
  11. D

    Disconnection times

    Hi all, can someone tell me what the disconnection time is for circuits supplied from a distribution circuit?
  12. La Poste

    Disconnection times

    This might help a few of us suffering the 2391 exam. Maximum disconnection times for a nominal rms line voltage to earth, U0 of 230V Firstly for a TN system: Final circuits not exceeding 32A = 0.4s Final circuits exceeding 32A = 5s Distribution circuits = 5s For a TT system Final circuits...
  13. J

    r.c.d. disconnection times.for a m.k. consumer unit.

    hi there does anyone knowthe tripping times for a m.k.sentry 63 amp/2 pole/30mA r.c.d.device,it is part of a 8 way m.k.consumer unit,i am not sure if this device as a time delay incorparated,the number on the front of it is say's m.k.sentry /63 amp/5760s,your help would be appreicated,cheers...
    • johnhainsby
    • Thread
    • aus consumer consumer unit disconnection unit
    • Replies: 11
    • Forum: Australia
  14. silver surfer

    disconnection times v voltage bands

    Guys BS 7671 table 41.1 shows that a disconnection time of 0.4 secs for 120<volts to <inc 230 volts, and a disconnection time of 0.2 at 230< to < inc 400v. (TN systems). My query is with a 10%+/- tolerance which could possibly increase 230 volts to 253 volts hence taking your 230v 0.4s disc...
  15. V

    Disconnection times for 30mA RCD at 5 times current.

    Hi guys ths is my first time on here and relatively new to electrics. I was asked to find the times of disconnection needed for 5x and 1x. I was wondeering if anyone could give me a push in the right direction by pointing out where i could find such useful info inthe BS 7671 or onsite guide...
    • volers
    • Thread
    • 30ma aus circuits current disconnection disconnection times guide inspection rcd testing times within
    • Replies: 22
    • Forum: Australia
  16. S

    Disconnection time on TT system

    Can a Sunnyboy SB3800 inverter disconnect on a TT system fast enough to prevent injury through shock? The installation has an RCD fitted and the inverter is connected to a 16 amp MCB. With the inverter having simple separation, does this negate the need for an RCD to protect the cable...
  17. D

    Max disconnection time

    hi lads i have few questions: what is max disconnection time for site hut lighting on a construction site ? max disconnection time for 110 V reduced low-voltage system ? reasons for the use of a 20 mA RCD ? Thanks for your fast reply!
    • dari_58
    • Thread
    • aus disconnection max time
    • Replies: 2
    • Forum: Australia
  18. S

    disconnection times

    Hi Guys, Wonder if any of you could try and explain to me if the reason for disconnection times for fuses /proctective devices etc. As on one hand, i was told at college it is to protect the cable from catching fire etc, and then iget the impression the reason for having say 0.4 disconnection...
  19. J

    Shed Installation Disconnection time?

    Hi I have a socket Radial off a 20A MCB and a lighting Radial off 6A MCB in a shed the board is fed by a 32amp MCB protected by an RCD on a TNCS syatem in the house. If I want the first point of fault ie the shed to trip first should I be using an RCBO for a TT system that trips under .2s? This...
    • Just
    • Thread
    • aus cable circuit disconnection house installation protected shed time
    • Replies: 115
    • Forum: Australia
  20. B

    Disconnection Times

    I've always wondered why BS7671 states that a disconnection time of 0.4s is required for circuits NOT exceeding 32A and for circuits exceeding 32A it is 5s Surely you would want the higher current to trip quicker? Can someone clarify this?

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