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63A Switch Fuse Melted

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    #32
    M cebee
    Closed Accounts Posts: 4,431 ✭✭✭M cebee


    i'm not sure that it's a good idea to remove the switchfuse/mcb from the distribution board and replace with switch


    it might be safer to leave the 2 in series in case there's a prob and you have tampered with pre-assembled DB


    although i've done it as it goes against my logic to have 2 63amps in series


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    #33
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    2011 wrote: »
    Even at that there is every chance that the cut out fuse would blow first if there was a short.

    Sometimes there just seems to be a policy to make up rules for the sake of being seen to do something.

    Yes indeed


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    #34
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    M cebee wrote: »
    i'm not sure that it's a good idea to remove the switchfuse/mcb from the distribution board and replace with switch
    No I wouldnt think that was being suggested, just that it is sort of redundant with the MCB in the line.


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    #35
    M cebee
    Closed Accounts Posts: 4,431 ✭✭✭M cebee


    Bruthal wrote: »
    No I wouldnt think that was being suggested, just that it is sort of redundant with the MCB in the line.

    yah i was talking to myself really


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    #36
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    M cebee wrote: »
    yah i was talking to myself really

    A sure sign of madness, as seen in my location on the left.


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    #37
    Andrew_Doran
    Registered Users Posts: 227 ✭✭Andrew_Doran


    Bruthal wrote: »
    I was thinking it is a rule requirement only if out in an outside box alright, more than a couple of meters away.

    I was reading about this last week.

    The regs say it's required if the tails are longer than 3 metres. Seperate to that the ESB code of practice talks about an IP rated enclosure and mounting it in their cabinet, but nothing about when the meter and distribution board are both inside.

    I think I also read about an amendment to the rules that says a type C MCB is now permissible as main OCPD because of nuisance tripping. I wonder what the motivation was for moving to MCBs.


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    #38
    M cebee
    Closed Accounts Posts: 4,431 ✭✭✭M cebee


    how tight does the fuse holder and cable connections actually need to be to prevent overheating later?


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    #39
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    M cebee wrote: »
    how tight does the fuse holder and cable connections actually need to be to prevent overheating later?

    Id say there is a good variation, as to how tight a connection is, has a bearing, which will depend on the overall contact area between wire end, and terminal.

    Imo, lugs are the best way of creating a connection which will reliably handle the capacity of a cable or wire, and much more so as they get bigger, since they convert the end of the cable into a nice flat contact area.

    But its probably the fuse contact which causes most of the problems in them sw fuses. They have a nice flat contact area also, but unlike lugs, are depending on just being held in place by the holder setup rather than tightly clamped.


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