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  1. #1
    Lord of Swine
    Necron99's Avatar
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    Another Electrical Question

    Looking at my power board I have a big fused guillotine switch for turning mains off and on and a small consumer unit with 4 circuit breakers from a manufacturer called CCS.
    I don't like the big fused guillotine switch, it looks primitive.
    But is there actually anything wrong with having one?
    Is there anything that I should/could replace it with?

    I don't really want to replace the whole lot with a big integrated consumer unit as I won't be in this place much longer.

  2. #2
    Thailand Expat
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    It is called a knife switch. Does what it is designed to do, that is switch under load. The contacts should be enclosed. Usually, here, under a tan coloured plastic cover

    Something like this



    If the cover is missing small curious fingers could stand on a chair and gain access.

    You could replace the whole lot with a Safe-T-Cut box.

    Better to think inside the pub, than outside the box?
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  3. #3
    Lord of Swine
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    What does that run? About 3000 baht?
    Is there any real benefit other than not having to replace the fuses if it trips?
    Adjustable sensitivity?

  4. #4
    Thailand Expat
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    Not sure about the cost I think they are more than that? You would have to check Home Pro, Global House or contact Safe-T-Cut directly.

    http://profile.yellowpages.co.th/en/522055131782001

    Safe-T-Cut will install for you .

    It replaces the simple switch with a ground fault interrupter (GFI) or residual current breaker (RCB) whichever it is called where you hail from.

    So yes in case of a fault it trips the whole house assuming that your house is grounded so it has somewhere to connect to ground. The adjustment is sensitivity, how many milliamps before it trips.

  5. #5
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    Quote Originally Posted by Necron99
    I don't really want to replace the whole lot with a big integrated consumer unit as I won't be in this place much longer.
    If you're not going to be there much longer and the present system is OK why bother.

    The knife switches are everywhere in Thailand - nothing wrong with them. If you need to change a fuse so what?

    If you need to keep changing fuses then there are other issues. A circuit breaker is still going to trip if you've got a problem somewhere.

  6. #6
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    Two Ronnies got by with four candles

  7. #7
    Thailand Expat superman's Avatar
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    Quote Originally Posted by david44
    Two Ronnies got by with four candles
    Are you sure it wasn't 'fork handles' ?

  8. #8
    Member EssEffBee's Avatar
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    Quote Originally Posted by VocalNeal View Post
    So yes in case of a fault it trips the whole house assuming that your house is grounded so it has somewhere to connect to ground. The adjustment is sensitivity, how many milliamps before it trips.
    Due to the nature of 'earthing systems' in Thailand, simply installing 1 or 6 earth rods can't guarantee an efficient earthing system. Since most rural areas use the IT earthing system, the installation of an earth rod may do little to nothing, to improve the safety of the installation.

    Also, an effectively wired earthing system is not required for an RCD to properly work.

    I wouldn't recommend using one 30mA RCD to control an entire installation (nuisance tripping). One RCD per circuit is best OR use a split consumer unit with RCD's for each required circuit.

    The maximum size earth leakage current is 30mA for personal protection. 100mA to 300mA is commonly used for fire protection. Do not use RCD's that can be adjusted above the 30mA level.
    Idiots! I'm surrounded by idiots!

  9. #9
    Member Joe66's Avatar
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    Quote Originally Posted by Necron99 View Post
    Is there any real benefit
    to survive

    Water and electricity make a dangerous cocktail at any time and European electricians who have inspected Local methods of wiring have warned us that, as foreigners, we are used to having earth/ground connections along with circuit breakers that are matched to current useage.
    In many cases in Thailand an earth/ground supply is not fitted at all and at that point the danger of electrocution increases dramatically. An indication of earth connection within a building is that the outlets will have three available pins instead of two. This however is not a guarantee that they are connected and, as with many brand new water pumps, the plugs on many appliances only have two pins. In which case they can only be earthed with an additional cable run to the appliance chassis.
    With the power supply here at high amps and 220 volts All installations and repairs should be done by a qualified technician and a wise buyer will insist on an earth supply
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  10. #10
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    Quote Originally Posted by EssEffBee
    Also, an effectively wired earthing system is not required for an RCD to properly work.
    You seem to be the first person to realise this

    Just for interest, in the UK school science labs require 1 mA RCCBs, this was fine until we had computer labs, most CRT monitors have several mA leakage current, my lab had 20 work stations. I ended up rewinding the transformer in the RCB.

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