Anonymous asked in Science & MathematicsEngineering · 9 months ago

When connecting a domestic appliance such as a TV, DVD player or LED security light etc.?

Does it really matter if I connect the live wire to the neutral of the applience and the neutral wire to the live of the appliance. I mean, it 's all a.c. -right!

10 Answers

  • Anonymous
    9 months ago

    You are clearly a person with little electrical knowledge, yet you make statements ad decisions that only a fully qualified electrical engineer could make. Have you herd of 'The Darwin Awards?'

  • 9 months ago

    thumb rule is that

    all equipment.gadgets and resistive loads like light bulbs that come with two pin plugs can be connected in any way.

  • Anonymous
    9 months ago

    Yes it is AC, but ONE of the supply pair is GROUNDED. If you meter both to ground, 1 will show mains voltage, the other will show 0 or just a very small voltage. The latter is the neutral, which can be touched by your hand, but NOT RECOMMENDED.

    You must NEVER reverse connections in most cases. It is also good practice to connect to mains as indicated by the appliance markings, even if what you are connecting is supposed to be 'double insulated'.

  • Vaman
    Lv 7
    9 months ago

    In some the negative terminal is grounded using the body. If the live terminal is connected to the negative terminal, then one should study the result.

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  • 9 months ago

    Appliances have a preferred polarity and a polarized plug, the Neutral leg is wider than the Hot leg. A properly wired socket has one side grounded in the building wiring system. The Neutral slot is longer than the Hot slot. Thinking at the system level imagine a Lamp with the frame improperly connected to the Hot side and while using it in the kitchen you grab the lamp and grab the faucet handle to turn on the cold water. A shocking experience.

    There are rules to follow when wiring appliances to prevent electrical accidents.

  • 9 months ago

    If those appliances are supposed to be connected to the mains through a non-polarized plug (large parts of Europe for grounded appliances, all of Europe for non-grounded appliances), then it doesn't matter.

    If they are supposed to be connected through a polarized plug (UK), then it can matter if the appliance develops a fault (usually won't, as the same appliances are nowadays also sold with non-polarized plugs).

    The main (but not the only) source of problems here is

    - the appliance has conductive parts that can be touched from the outside (like a metal case)

    - those conductive parts aren't grounded but instead are or become connected to the neutral

    - then, if you swap out phase and neutral, that case becomes "hot" and not really pleasant to touch...

  • 9 months ago

    All of them run normally, except lost safety from electric shock if the device has electric leakage. Because TV commonly now without using big transformer, its metal chassis is connected to neutral line directly via a capacitor coupling. Neutral line has zero voltage and would not give electric shock by touching it. As by mistake, chassis is connected line, touching its metal chassis now could have a electric shock even via a capacitor ( limit the AC current and give a bit protection ).

    Reverse power connection to a sensity sound amplifier could result hamming noise.

    Reverse power connection to 120V LED bulb result the bulb metal base ( not the centre pin) carries Hot 120V, might get electric shock while replacing the bulb because the switch is no more cut off the Hot line even switch is in OFF position.

  • D g
    Lv 7
    9 months ago

    depends on the appliance 

    a TOASTER  would be a bad idea..

    the neutral wire is  GROUNDED  usually at some point like the  BREAKER BOX..

    this means that if  there is a broken live wire   there  is NO VOLTAGE  to the device .. it will be  GROUND  ..

    not so with the  HOT  ..

    if you connect the HOT wire  of the  electrical cord to the neutral wire location .. you are  connecting the    LIVE  AC to the outside of the case ..  THAT Was the part that should have had the   grounded neutral wire..

    the  CASE is now at  120 volts and if you were to  touch it while say .. touching a  TAP of the sink ..  the  120 volts might like your  body as a short cut to  ground  instead of   the wire and  electricute you..

  • Anonymous
    9 months ago

    If the appliance develops a fault its casing can then become live and hopefully the fuse would save the day if touched but you've added to the danger by swapping.

  • If it works, then don't question it. Such is life.

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