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borrowed neutral

Discussion in 'Electrical Engineering' started by steven.allsopp, Nov 2, 2003.

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  1. what is borrowed neutral and is it dangerous?
     
  2. no such thing in the electrical industry....however, there is a 'shared
    neutral'. Big difference.

    It is only dangerous to "Bubba", who is confused with anything other that 2
    wire romex.
     
  3. John Gilmer

    John Gilmer Guest

    Maybe someone "invented" the term to describe a load connected to a HOT in
    one cable and a NEUTRAL in another cable.

    Slight OT: The air handler of my heatpump runs off 240 volts and nothing
    requires 120. BUT someone decided to have the condensate pump run off the
    same circuit but he needed a neutral for the 120 volt pump. No problem: he
    just used the ground! (Yes, it was a bad idea from many prospectives!
    The only protection for the #16 wire to the pump was a 60 amp breaker!)
     
  4. Nukie Poo

    Nukie Poo Guest

    That someone was most likely the HVAC installer. I see that crap all the
    time. 240V condensate pumps are readily available, but with a heat pump,
    you'd need to employ a tap feeding a disconnect w/OCD or a separate circuit.
     
  5. sQuick

    sQuick Guest

    Maybe this is just a UK term? I've heard it
    used very often.

    A borrowed neutral is where a neutral is used from
    another circuit.

    This makes isolation and fault finding difficult and also
    can be dangerous where the neutral is 'borrowed' from
    a circuit of lower current carrying capacity.

    sQuick
     
  6. Paul

    Paul Guest

    It is also dangerous if you test i.e. a light fitting dead, split the two
    neural wires within and find one live through another lamp fitting further
    along.
    It did hurt. (Voice of experience!!)

    PF
     
  7. s

    s Guest

    lol,done it many times!!
     
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